CN103633537B - The low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled - Google Patents
The low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled Download PDFInfo
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Abstract
This application provides the low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled, it includes light channel structure and circuit structure, wherein, described light channel structure includes agitator, acousto-optic frequency shifters, fiber amplifier, pulse shortener, optical fiber spread spectrum device and relevant heterodyne beat device；Described circuit structure includes that front feedback circuit controls phase device and phase-locked loop circuit controls repetition rate device.Wherein fibre laser oscillator can ensure that system long time running, and system stability is better than solid laser oscillator；The intracavity net dispersion of fiber oscillator device, agitator introduce inner chamber manipulator by optimizing and uses the technology such as the front acousto-optic frequency shifters fed back, realizing the optical-fiber laser frequency comb device of low noise；The use of acousto-optic frequency shifters simultaneously, with the carrier_envelop phase offset frequency of accuracy controlling optical frequency com, thus can be embodied as the application such as opctical frequency standard, attosecond science, nonlinear optics and provides the frequency comb device steady in a long-term with fine phase regulation and control.
Description
Technical field
The present invention relates to ultrafast Fiber laser technology field, particularly relate to the low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled.
Background technology
Femtosecond laser frequency comb is one of research contents of forefront, ultra-short pulse laser field.At the end of the nineties in last century, the proposition of laser frequency based on femtosecond titanium-doped sapphire comb and realization make opctical frequency standard there occurs revolutionary progress.In recent years, along with the development of ultrashort pulse optical-fiber laser, the advantage such as optical fiber laser compact structure and stable operating makes optical frequency com based on optical-fiber laser also gradually be paid close attention to by people.2002, American National Standard technical research institute (NIST) reported first Erbium doped fiber laser frequency comb, 2010, IMRA America Inc. also reports the realization of the output high power Yb dosed optical fiber frequency comb higher than 80W, up to now, these optical-fiber laser frequency comb have played important function in fields such as opctical frequency standard, precision spectroscopy research, laser ranging and astrosurveillances.
But for comparing Ti∶Sapphire laser light comb, the phase noise of optical-fiber laser frequency comb is relatively large, this is owing to optical fiber laser is semiconductor laser pump-coupling, semiconductor laser drive current ripple etc. can introduce excessive noise, and optical fiber exists many complicated nonlinear effect impacts, these increase the phase noise of optical fiber light comb the most further.In order to solve this problem, there has been proposed a lot of effective method, such as the pumping current of semiconductor laser is done intensity stabilization, suppress current noise therein, dispersion measure in regulation fibre laser oscillator makes intracavity net dispersion can effectively reduce phase noise close to zero, then recycling electrical feedback controls technology and forms closed loop control phase noise further by brake, here brake can be that quasiconductor drives power supply, intracavity piezoelectric ceramics, or electrooptic modulator etc., these methods are used to obtain good pressing result of making an uproar mutually, the 3db live width making optical fiber frequency comb carrier_envelop phase offset frequency falls below tens KHz magnitudes from tens initial order of megahertz, substantially can be close to the level of making an uproar mutually of titanium-doped sapphire frequency comb.But, it is exactly when using feedback circuit locking that these methods have shortcoming, one be need proportional integral (PI) loop of phaselocked loop carry out time integral obtain control signal, two be locked out after carrier_envelop phase offset frequency be a fixed value, it is impossible to be adjusted.
It would therefore be desirable to the device of a kind of the most front feedback control being capable of optical fiber light comb, while reducing the phase noise of optical fiber light comb, it is achieved the low noise optical fiber optical frequency com that carrier_envelop phase offset frequency is controlled.
Summary of the invention
It is an object of the invention to propose the low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled, it is capable of the most front feedback control of optical fiber light comb, while reducing the phase noise of optical fiber light comb, it is achieved the low noise optical fiber optical frequency com that carrier_envelop phase offset frequency is controlled.
For reaching this purpose, the present invention by the following technical solutions:
The low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled, including light channel structure and circuit structure, wherein, described light channel structure includes fibre laser oscillator, acousto-optic frequency shifters, fiber amplifier, pulse shortener, optical fiber spread spectrum device and relevant heterodyne beat device；
Described fibre laser oscillator is used for producing femto-second laser pulse, when described femtosecond laser pulse is to acousto-optic frequency shifters, zero order diffracted light enters fiber amplifier and amplifies at least one times, laser after amplifying at least one times enters pulse shortener and carries out Pulse Compression, laser after compression enters optical fiber spread spectrum device and carries out spread spectrum, detects and obtain carrier_envelop phase offset frequency signal in the laser light incident after spread spectrum to relevant heterodyne beat device；
Described circuit structure includes that front feedback circuit controls phase device and phase-locked loop circuit controls repetition rate device；
Front feedback circuit controls phase device for controlling and change the carrier_envelop phase offset frequency of femtosecond pulse, the carrier_envelop phase offset frequency measured above is mixed with External frequency signals, the amplified driver being directly defeated by acousto-optic frequency shifters of mixed frequency signal obtained, the first-order diffraction light frequency driving acousto-optic frequency shifters changes, thus plays the stable and effect of regulation and control femtosecond light comb carrier_envelop phase offset frequency；
Repetition rate phase-locked loop circuit is for controlling the repetition rate of femtosecond pulse, photodetector detecting oscillations device output light is used to obtain repetition rate signal, and this signal and external reference source signal are exported to phase-locked loop circuit simultaneously, processed by phase demodulation, proportional integral and obtain feedback control signal, then by this control signal driving pressure electroceramics, long by the flexible change chamber of piezoelectric ceramics, thus by repetition rate semaphore lock to stable foreign frequency reference source.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency, the mean power of the output pulse laser of described fibre laser oscillator is more than 100mW, output repetition rate is more than 200MHz, the centre wavelength of output spectrum is 1040nm, the pulse width of Output of laser is 1ps, can reach below 50fs after pulse shortener.
As a kind of preferred version of the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency, described fibre laser oscillator also include dispersion control device, described dispersion control device include reflecting grating to or transmission grating pair.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency, described agitator also includes inner chamber manipulator, described inner chamber manipulator is arranged in oscillator chamber body, and described inner chamber manipulator is electrooptical crystal modulator or Graphene manipulator.
As a kind of preferred version of the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency, described fiber amplifier is amplified by single-stage or multi-stage fiber and forms.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency, optical fiber spread spectrum device is for drawing bevel-type optical fiber, described bevel-type single-mode fiber is drawn to use standard single-mode fiber, the mid portion of standard single-mode fiber is carried out optical fiber and draws cone, final optical fiber draws the core diameter of wimble fraction less than or equal to 4 μm, draw a length of about the 10cm of cone, 8.2 μm when the core diameter at optical fiber two ends is not draw cone.
nullA kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency，Described relevant heterodyne beat device includes dichroic mirror、Frequency-doubling crystal、Low pass filters、Avalanche diode、Condenser lens and some laser high reflective mirrors，The super continuous laser inciding dichroic mirror is divided into short-wave band and long wave band two-way by described dichroic mirror，Light path time delay is added in short-wave band light path，Two-way light turns back respectively through high reflective mirror，Again in high reflective mirror and lens focus to frequency-doubling crystal，Frequency-doubling crystal makes long wave band laser freuqency doubling，Two-way light makes the frequency doubled light of the short-wave band in light path and long wave band pass through by low pass filter again and stops the transmission of other wave band，After avalanche diode is placed on optical filter，The carrier_envelop phase offset frequency signal produced for the frequency doubled light and short-wave band beat frequency that detect long wave band.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency, described front feedback circuit controls phase device and includes frequency mixer and filter amplifier, described front feedback circuit is controlled phase device and is mixed by the frequency reference source signal of carrier_envelop phase offset frequency signal with the external stabilization through frequency synthesizer conversion by frequency mixer, then exports to acousto-optic frequency shifters after amplifier filter and amplification after filtering.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier_envelop phase offset frequency, phase-locked loop circuit controls repetition rate device and also includes Electro-Optical Sensor Set, and the higher hamonic wave of the fibre laser oscillator repetition rate signal detected is directly inputted in phase-locked loop circuit by described photodetector.
The invention have the benefit that and this application provides the low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled, it includes light channel structure and circuit structure, wherein, described light channel structure includes fibre laser oscillator, acousto-optic frequency shifters, fiber amplifier, pulse shortener, optical fiber spread spectrum device and relevant heterodyne beat device；Described circuit structure includes that front feedback circuit controls phase device and phase-locked loop circuit controls repetition rate device.Wherein fibre laser oscillator can ensure that system long time running, and system stability is better than solid laser oscillator；The intracavity net dispersion of fiber oscillator device, agitator introduce inner chamber manipulator by optimizing and uses the technology such as the front acousto-optic frequency shifters fed back, realizing the optical-fiber laser frequency comb device of low noise；Acousto-optic frequency shifters and the use of frequency mixer simultaneously, with the carrier_envelop phase offset frequency of accuracy controlling optical frequency com, thus can be embodied as the application such as opctical frequency standard, attosecond science, nonlinear optics and provides the frequency comb device steady in a long-term with fine phase regulation and control.
Accompanying drawing explanation
Fig. 1 is the low noise optical-fiber laser frequency comb structural representation that the optical frequency of the embodiment of the present invention is controlled；
Fig. 2 is the high repetition frequency of the embodiment of the present invention, ring cavity optical laser agitator schematic diagram；
Fig. 3 is the structural representation drawing bevel-type highly nonlinear optical fiber of the embodiment of the present invention；
Fig. 4 is the relevant heterodyne beat device schematic diagram of the embodiment of the present invention；
Fig. 5 is the carrier_envelop phase offset frequency lock schematic diagram of the embodiment of the present invention.
Wherein:
1: fibre laser oscillator；2: acousto-optic frequency shifters；3: fiber amplifier；4: pulse shortener；5: optical fiber spread spectrum device；6: relevant heterodyne beat device；7: front feedback circuit controls phase device；8: phase-locked loop circuit controls repetition rate device；
11: dispersion control device；12: inner chamber manipulator；13: fiber section；14: polarization locked mode controls device；15: pumping laser light source；
61: dichroic mirror；62: frequency-doubling crystal；63: low pass filters；64: avalanche diode；65: the second high reflective mirrors；66: the first high reflective mirrors；67: the three high reflective mirrors；68: the first lens；69: the second lens；
71: frequency synthesizer；72: frequency mixer；73: filter amplifier.
Detailed description of the invention
Further illustrate technical scheme below in conjunction with the accompanying drawings and by detailed description of the invention.
As Figure 1-5, the invention provides the low noise optical-fiber laser frequency comb device that a kind of carrier_envelop phase offset frequency is controlled, including light channel structure and circuit structure, wherein, light channel structure includes fibre laser oscillator 1, acousto-optic frequency shifters 2, fiber amplifier 3, pulse shortener 4, optical fiber spread spectrum device 5 and relevant heterodyne beat device 6.
Fibre laser oscillator 1 is used for producing femto-second laser pulse, when femtosecond laser pulse is to acousto-optic frequency shifters 2, zero order diffracted light enters fiber amplifier 3 and amplifies at least one times, laser after amplifying at least one times enters pulse shortener 4 and carries out pulse compression, laser after compression enters optical fiber spread spectrum device 5 and carries out spread spectrum, detects and obtain carrier_envelop phase offset frequency signal (f in the laser light incident after spread spectrum to relevant heterodyne beat device 6ceo)。
Circuit structure includes that front feedback circuit controls phase device 7 and phase-locked loop circuit controls repetition rate device 8；
Front feedback circuit controls phase device 7 for by fceoSemaphore lock exports to acousto-optic frequency shifters 2 to rear on the frequency reference source of external stabilization；
Front feedback circuit controls phase device 7 for controlling and change the carrier_envelop phase offset frequency of femto-second laser pulse, the carrier_envelop phase offset frequency measured above is mixed with External frequency signals, the amplified driver being directly defeated by acousto-optic frequency shifters 2 of mixed frequency signal obtained, the first-order diffraction light frequency driving acousto-optic frequency shifters 2 changes, thus plays the stable and effect of regulation and control femtosecond light comb carrier_envelop phase offset frequency；
The repetition rate phase-locked loop circuit of phase-locked loop circuit control repetition rate device 8, for controlling the repetition rate of femtosecond pulse, uses photodetector detecting oscillations device output light to obtain repetition rate signal (frep), and this signal and external reference source signal are exported to phase-locked loop circuit simultaneously, processed by phase demodulation, proportional integral and obtain feedback control signal, then by this control signal driving pressure electroceramics, long by the flexible change chamber of piezoelectric ceramics, thus by repetition rate semaphore lock to stable foreign frequency reference source.
The mean power of the output pulse laser of fibre laser oscillator 1 is more than 100mW, and output repetition rate is more than 200MHz, and the centre wavelength of output spectrum is 1040nm, and the pulse width of Output of laser is about 1ps, can reach below 50fs through later.
Fibre laser oscillator 1 include dispersion control device 11, dispersion control device 11 include reflecting grating to or transmission grating pair.Fibre laser oscillator 1 also includes that inner chamber manipulator 12, inner chamber manipulator 12 are arranged in fibre laser oscillator 1 cavity, and inner chamber manipulator 12 is electrooptical crystal modulator or Graphene manipulator.
Above-mentioned fibre laser oscillator 1 also includes the pumping laser light source 15 providing energy.
More specifically, fibre laser oscillator 1 is high repetition frequency fiber oscillator device, and its structure is as in figure 2 it is shown, use the mode locked mode of the nonlinear polarization rotation of standard.Whole fiber oscillator device is divided into fiber section 13 and space optical path part, wherein fiber section 13 includes gain fibre and general single mode fiber, the gain fibre used gain at wavelength 915nm is more than 350dB/m, a length of about 20cm, and other are all made up of general single mode fiber；Space optical path is controlled three parts such as device 14 by dispersion control device 11, inner chamber manipulator 12 and polarization locked mode and forms, wherein dispersion control device 11 is two panels reflecting grating or transmission grating composition, grating line density is every millimeter of 600 lines, blaze wavelength is 1040nm, and diffraction efficiency of grating is more than 85%；Typical inner chamber manipulator 12 uses electrooptic modulator (EOM)；Polarization locked mode controls device 14 and is made up of half-wave plate, quarter-wave plate, polarization splitting prism and spatial light isolator.By regulation dispersion control device 11 can make whole fibre laser oscillator 1 locked mode operate at nearly zero or polarization dispersion near, by carefully regulation intracavity polarizer, vertical output end at polarization splitting prism can realize stable mode-locked laser output, the repetition rate of mode locking pulse > 200MHz, output > 100mW, centre wavelength is near 1040nm, and output pulse width is about 1ps.
The pulse of fibre laser oscillator 1 output is in condenser lens incides acousto-optic frequency shifters 2, wherein the negative one order diffraction light of acousto-optic frequency shifters 2 is as follow-up laser frequency comb output, and zero order diffracted light is coupled in fiber amplifier 3 by optical fiber collimator.Fiber amplifier 3 is amplified by single-stage or multi-stage fiber and forms, final amplify after the magnitude that reaches watt of average laser power.
Pulse shortener 4 include reflecting grating to or transmission grating.Amplify laser pulse through high efficiency reflecting grating to or transmission grating to being compressed, the incisure density of grating is every millimeter of 1250 lines, diffraction efficiency is more than 90%, it is placed in parallel between grating pair, laser incides on grating with Littrow angle, is turned back by 0 ° of former road of high reflective mirror after grating is to diffraction, is again introduced into grating and compresses carrying out second time, use 45 ° of high reflective mirrors to be derived by the laser in gratings compressor afterwards, finally give pulse width and be about the output of 50fs laser pulse.
Optical fiber spread spectrum device 5 is for drawing bevel-type single-mode fiber, described bevel-type single-mode fiber is drawn to use standard single-mode fiber, the mid portion of standard single-mode fiber is carried out optical fiber and draws cone, final optical fiber draws the core diameter of wimble fraction less than or equal to 4 μm, draw a length of about the 10cm of cone, 8.2 μm when the core diameter at optical fiber two ends is not draw cone, so ensure that higher space optical coupling is to the coupling efficiency of optical fiber.
Further preferred, laser pulse after compression focuses on through non-spherical lens and is coupled to draw in bevel-type highly nonlinear optical fiber, after highly nonlinear optical fiber spread spectrum, one octave of super continuum light spectral limit covering obtaining laser is even broader, obtaining the output of approximately parallel laser through microcobjective collimation again, the efficiency of whole space optical coupling to highly nonlinear optical fiber is more than 60%.
Relevant heterodyne beat device 6 includes dichroic mirror 61, frequency-doubling crystal 62, low pass filters 63, avalanche diode 64, condenser lens and some laser high reflective mirrors, the super continuum light inciding dichroic mirror 61 is composed laser and is divided into short-wave band and long wave band two-way by dichroic mirror 61, light path time delay is added in short-wave band light path, two-way light turns back respectively through high reflective mirror, focus on frequency-doubling crystal 62 through high reflective mirror and lens 68, frequency-doubling crystal 62 makes long wave band laser freuqency doubling, two-way light makes the frequency doubled light of the short-wave band in light path and long wave band pass through by low pass filter 63 again and stops the transmission of other wave band, after avalanche diode 64 is placed on low pass filter 63, the f produced for the frequency doubled light and short-wave band beat frequency that detect long wave bandceoSignal.
Laser in the circulation way that relevant heterodyne beat device is concrete is: super continuous laser incides on dichroic mirror 61, the wave-length coverage of 1050nm～1500nm is reflected by dichroic mirror 61 by the wave-length coverage transmission of 550nm～950nm, therefore in super continuum light spectrum, long wave band and short-wave band are separated, wherein in transmission laser (short-wave band) light path, the second high reflective mirror 65 is arranged on a translation stage, main purpose is to provide time delay light path, makes the pulse laser of long wave band and short-wave band overlap in time；Separate two-way light overlaps through the first high reflective mirror 66 inflection rear space and incides on 45 ° of the 3rd high reflective mirror 67, focus on frequency-doubling crystal 62 through the first lens 68 again, second lens 69, by beam path alignment outgoing, incide on avalanche diode 64 through low pass filters 63.Above-mentioned first lens 68 and the second lens 69 are condenser lens, the first high reflective mirror 66 be near-infrared laser high reflective mirror, the second high reflective mirror 65 be visible light lasers high reflective mirror, the 3rd high reflective mirror 67 be silver-plated laser high reflective mirror.
Laser frequency-doubling crystal 62 in relevant heterodyne beat device is by the laser freuqency doubling of long wave band, and wavelength identical in the short-wave band that the frequency doubled light of generation is composed with super continuum light becomes
Dividing and carry out beat frequency, the signal obtained is fceoSignal；Due to fceoSignal is to be carried in shortwave
In Fen, it is therefore desirable to use low pass filters 63 to filter other wavelength components and only allow the short wavelength components of narrower range pass through, in order to avoid introducing too much noise.Meanwhile, spectrum analyzer is used to observe fceoSignal, overlap by repeatedly regulating laser time delays line in relevant heterodyne beat device and space optical path, the grating of optimization fibre laser oscillator 1 intracavity is to parameters such as spacing, the laser power of fiber amplifier 3 and the laser polarization states inciding spectrum expanding unit 5, until fceoThe signal to noise ratio of signal is higher than 30dB, till live width is about 100kHz.
Above-mentioned is all light path part of the controlled low noise optical-fiber laser frequency comb device of carrier_envelop phase offset frequency, the following is feedback control and the lock part of circuit:
Front feedback circuit controls phase device and includes frequency synthesizer 71, frequency mixer 72 and filter amplifier 73, and front feedback circuit controls phase device by frequency mixer 72 by fceoThe frequency reference source signal mixing of signal and the external stabilization through frequency synthesizer 71 conversion, then export to acousto-optic frequency shifters 2 after amplifier 73 filter and amplification after filtering.
Phase-locked loop circuit controls repetition rate device 8 and also includes Electro-Optical Sensor Set, and described photodetector will detect the f of fibre laser oscillator 1repThe higher hamonic wave of signal exports and controls repetition rate device 8 to the phase-locked loop circuit of laser oscillator, by on repetition rate semaphore lock to external stabilization frequency reference source, then phase-locked loop circuit is controlled the control signal that repetition rate device 8 obtains export and control its repetition rate to fibre laser oscillator 1.
Whole system needs the parameter of locking to have two frepSignal and fceoSignal, wherein frepThe lock mode of signal is as shown in Figure 1: uses the output light of photodetector detection optical fiber laser oscillator 1, obtains frepIts higher hamonic wave is also input in phase-locked loop circuit control repetition rate device 8 by signal, and a stable external reference source also enters in phase-locked loop circuit control repetition rate device 8 as reference standard, by f simultaneouslyrepSemaphore lock is on external reference source.
fceoThe locking of signal relies primarily on feedback circuit lock-in techniques before acousto-optic frequency shifters 2 shift frequency, concrete principle and enforcement step as shown in Figure 5: first, the f obtained by relevant heterodyne beat device 6ceoSignal and the external stabilization converted through frequency synthesizer 71 and reference source signal f of changeable frequencyRCarry out mixing and obtain mixed frequency signal fceo+fR, by mixed frequency signal being loaded directly in acousto-optic frequency shifters 2 after filtering, amplification；Secondly, (optical frequency signal is f to incident laserceo+n×frep) produce zero order diffracted light and negative one order diffraction light by acousto-optic frequency shifters 2, in the negative one order diffraction light of acousto-optic frequency shifters 2, the mixed frequency signal being carried in acousto-optic frequency shifters 2 can be carried :-(fceo+fR), therefore, the output frequency of the negative one order diffraction light of acousto-optic frequency shifters 2 be optical frequency signal and mixed frequency signal and frequency, i.e. (fceo+n×frep)-(fceo+fR)=n×frep-fR, it is appreciated that in the optical frequency signal of negative one order diffraction light and has not contained fceoSignal, and comprise only the repetition rate signal f lockedrepWith reference source signal fR, when frequency f of the external reference source changed through frequency synthesizer 71 conversionRTime, will directly change the carrier_envelop phase offset frequency of incident laser, thus reach the purpose controlled to the carrier_envelop phase offset frequency of optical frequency com.
The low noise optical-fiber laser frequency comb device that the carrier_envelop phase offset frequency of the application offer is controlled has advantage in detail below: first, the fiber oscillator device system of high repetition frequency ensure that the energy of the single comb of Output of laser is higher, is more suitable for needing the application of high-energy comb；Secondly, by methods such as the optimization of fiber oscillator device intracavity net dispersion, the use of inner chamber manipulator and front feedback control lockings, the optical fiber frequency comb device of low noise is produced；Again, by the way of acousto-optic frequency shifters adds frequency mixer, it is possible to achieve the carrier_envelop phase offset frequency controllable precise to optical frequency com；Finally, optical fiber frequency comb device based on fiber oscillator device makes whole system operating more stable, has greater advantage for fields such as long-time measurements.
The know-why of the present invention is described above in association with specific embodiment.These describe the principle being intended merely to explain the present invention, and can not be construed to limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art need not pay performing creative labour can associate other detailed description of the invention of the present invention, within these modes fall within protection scope of the present invention.
Claims (9)
1. the low noise optical-fiber laser frequency comb device that carrier_envelop phase offset frequency is controlled, including light
Line structure and circuit structure, it is characterised in that described light channel structure includes fibre laser oscillator, acousto-optic
Frequency shifter, fiber amplifier, pulse shortener, optical fiber spread spectrum device and relevant heterodyne beat device；
Described fibre laser oscillator is used for producing femto-second laser pulse, and described femtosecond laser pulse is extremely
During acousto-optic frequency shifters, zero order diffracted light enters fiber amplifier and amplifies at least one times, through at least one times
Laser after amplification enters pulse shortener and carries out Pulse Compression, and laser after compression enters optical fiber spread spectrum
Device carries out spread spectrum, detects and obtain carrier wave bag in the laser light incident after spread spectrum to relevant heterodyne beat device
Network phase shifting frequencies signal；
Described circuit structure includes that front feedback circuit controls phase device and phase-locked loop circuit controls to repeat frequency
Rate device；
Front feedback circuit controls phase device for controlling and change the carrier envelope phase of femto-second laser pulse
Shift frequency rate, is mixed the carrier_envelop phase offset frequency measured above with external reference source frequency,
To the amplified driver being directly defeated by acousto-optic frequency shifters of mixed frequency signal, drive acousto-optic frequency shifters one-level
Diffraction light frequency shift, thus play the stable and effect of regulation and control femtosecond light comb carrier_envelop phase offset frequency；
Repetition rate phase-locked loop circuit, for controlling the repetition rate of femtosecond pulse, uses photodetector to visit
Survey agitator output light and obtain repetition rate signal, and the while of by this signal and external reference source frequency signal
Export to phase-locked loop circuit, processed by phase demodulation, proportional integral and obtain feedback control signal, then should
Control signal driving pressure electroceramics, long by the flexible change chamber of piezoelectric ceramics, thus repetition rate is believed
Number lock onto stable external reference source.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 1 is controlled
Rate carding device, it is characterised in that the mean power of the output laser pulse of described fibre laser oscillator is big
In 100mW, output repetition rate is more than 200MHz, and the centre wavelength of output spectrum is 1040nm,
Directly the pulse width of Output of laser is 1ps, can reach below 50fs after pulse shortener.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 2 is controlled
Rate carding device, it is characterised in that described fibre laser oscillator also includes dispersion control device, described color
Dissipate control device include reflecting grating to or transmission grating pair.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 3 is controlled
Rate carding device, it is characterised in that described fibre laser oscillator also includes inner chamber manipulator, described inner chamber
Manipulator is arranged in oscillator chamber body, and described inner chamber manipulator is electrooptical crystal modulator or Graphene
Manipulator.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 1 is controlled
Rate carding device, it is characterised in that described fiber amplifier is made up of single-stage or multi-stage fiber amplifier.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 1 is controlled
Rate carding device, it is characterised in that optical fiber spread spectrum device for drawing bevel-type optical fiber, described in draw bevel-type single-mode fiber
Use standard single-mode fiber, the mid portion of standard single-mode fiber is carried out optical fiber and draws cone, final light
Fibre draws the core diameter of wimble fraction less than or equal to 4 μm, draws a length of about the 10cm of cone, optical fiber two ends
8.2 μm when core diameter is not draw cone.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 1 is controlled
Rate carding device, it is characterised in that described relevant heterodyne beat device includes dichroic mirror, frequency-doubling crystal, low
Pass filter sheet, avalanche diode, condenser lens and some laser high reflective mirrors, described dichroic mirror will incide
The super continuous laser of dichroic mirror is divided into short-wave band and long wave band two-way, adds in short-wave band light path
Light path time delay, two-way light turns back respectively through high reflective mirror, more brilliant to frequency multiplication through high reflective mirror and lens focus
On body, frequency-doubling crystal makes long wave band laser freuqency doubling, after two-way light collimation, then is made by low pass filter
Short-wave band and the frequency doubled light of long wave band in light path pass through and stop the transmission of other wave band, snowslide two
After pole pipe is placed on optical filter, the frequency doubled light and short-wave band beat frequency for detecting long wave band produces
Carrier_envelop phase offset frequency signal.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 1 is controlled
Rate carding device, it is characterised in that described front feedback circuit controls phase device to be included frequency synthesizer, mix
Frequently device and filter amplifier, described front feedback circuit controls phase device by frequency mixer by carrier envelope phase
Move frequency signal to be mixed with the stable external reference source frequency signal through frequency synthesizer conversion, then warp
Export to acousto-optic frequency shifters after crossing filter amplifier filter and amplification.
The low noise optical-fiber laser frequency that carrier_envelop phase offset frequency the most according to claim 1 is controlled
Rate carding device, it is characterised in that phase-locked loop circuit controls repetition rate device and also includes Electro-Optical Sensor Set,
Described photodetector is by direct for the higher hamonic wave of the fibre laser oscillator repetition rate signal detected
It is input in phase-locked loop circuit.
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