CN103633537A - Low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency - Google Patents
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Abstract
The application provides a low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency. The low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency comprises an optical path structure and a circuit structure, wherein the optical path structure comprises an oscillator, an acousto-optic frequency shifter, an optical fiber amplifier, a pulse compressor, an optical fiber spread spectrum device and a coherent heterodyne beat device; and the circuit structure comprises a feed-forward circuit control phase device and a phase-locked loop circuit control repetition frequency device. The fiber laser oscillator can ensure long-time operation of a system, so that the stability of the system is superior to that of a system adopting a solid laser oscillator; through the technologies of optimizing intracavity net dispersion of the fiber oscillator, introducing an inner cavity modulator in the oscillator, adopting the feed-forward acousto-optic frequency shifter, and the like, the low noise fiber laser frequency combs device can be realized; and meanwhile, due to the application of the acousto-optic frequency shifter, the carrier envelope phase shift frequency of the optical frequency combs can be accurately regulated, so that the optical frequency combs device with precise phase position regulation and secular stability is provided for realizing applications such as optical frequency standard, attosecond science and non-linear optics.
Description
Technical field
The present invention relates to ultrafast Fiber laser technology field, relate in particular to the controlled low noise optical-fiber laser frequency comb device of a kind of carrier envelope phase shift frequency.
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, proposition and the realization of the laser frequency comb based on femtosecond titanium-doped sapphire make optical frequency standard that revolutionary progress occur.In recent years, along with the development of ultrashort pulse optical-fiber laser, fiber laser compact structure and the stable advantages such as running are also paid close attention to the optical frequency com based on optical-fiber laser gradually by people.2002, American National Standard technical research institute (NIST) reported first Er-doped fiber laser frequency comb, 2010, IMRA America Inc. has also reported the realization of power output higher than the high power Yb dosed optical fiber frequency comb of 80W, up to now, these optical-fiber laser frequency comb have been brought into play important function in fields such as optical frequency standard, precision spectroscopy research, laser ranging and astrosurveillances.
But compare titanium brilliancy comb, the phase noise of optical-fiber laser frequency comb is relatively large, this is because fiber laser is semiconductor laser pump-coupling, semiconductor laser drive current ripples etc. can be introduced excessive noise, and in optical fiber, existing the nonlinear effect of many complexity to affect, these have also further strengthened the phase noise of optical fiber comb.In order to address this problem, people have proposed a lot of effective methods, such as the pumping current to semiconductor laser is done intensity stabilization, compacting current noise wherein, regulate the dispersion measure in fibre laser oscillator to make net dispersion approaching zero in chamber can effectively reduce phase noise, and then utilize electrical feedback control technology further to form closed-loop control phase noise by brake, the brake here can be semiconductor driving power, piezoelectric ceramic in chamber, or electrooptic modulator etc., adopt these methods to obtain the pressing result of well making an uproar mutually, make the 3db live width of optical fiber frequency comb carrier envelope phase shift frequency drop to tens KHz magnitudes from tens initial order of megahertz, substantially can approach the level of making an uproar mutually of titanium-doped sapphire frequency comb.But, the total shortcoming of these methods is exactly when adopting feedback circuit locking, the one, need proportional integral (PI) loop of phase-locked loop to carry out time integral acquisition control signal, the 2nd, the carrier envelope phase shift frequency after locking is a fixed value, can not regulate.
Therefore, we need a kind of device that can realize the in real time front FEEDBACK CONTROL of optical fiber comb, when reducing the phase noise of optical fiber comb, realize the controlled low noise fiber optics frequency comb of carrier envelope phase shift frequency.
Summary of the invention
The object of the invention is to propose the controlled low noise optical-fiber laser frequency comb device of a kind of carrier envelope phase shift frequency, can realize the in real time front FEEDBACK CONTROL of optical fiber comb, when reducing the phase noise of optical fiber comb, realize the controlled low noise fiber optics frequency comb of carrier envelope phase shift frequency.
For reaching this object, the present invention by the following technical solutions:
The low noise optical-fiber laser frequency comb device that a kind of carrier envelope phase shift frequency is controlled, comprise light channel structure and circuit structure, wherein, described light channel structure comprises 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 for generation of femto-second laser pulse, described femtosecond laser pulse is during to acousto-optic frequency shifters, zero order diffracted light enters fiber amplifier and carries out that at least single step of releasing is large, 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, and the laser after spread spectrum is incident in relevant heterodyne beat device and surveys and obtain carrier envelope phase shift frequency signal;
Described circuit structure comprises front feedback circuit control phase device and phase-locked loop circuit control repetition rate device;
Front feedback circuit control phase device is for controlling and change the carrier envelope phase shift frequency of femtosecond pulse, the carrier envelope phase shift frequency measuring above and foreign frequency signal are carried out to mixing, the mixed frequency signal obtaining is through amplifying the driver of being directly defeated by acousto-optic frequency shifters, drive the first-order diffraction light frequency of acousto-optic frequency shifters to change, thereby play effect stable and regulation and control femtosecond light comb carrier envelope phase shift frequency;
Repetition rate phase-locked loop circuit is for controlling the repetition rate of femtosecond pulse, use photodetector detecting oscillations device output light to obtain repetition rate signal, and this signal and external reference source signal are exported to phase-locked loop circuit simultaneously, by phase demodulation, proportional integral, process and obtain feedback control signal, then this control signal is driven to piezoelectric ceramic, flexible change chamber by piezoelectric ceramic is long, thereby repetition rate semaphore lock is arrived 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 envelope phase shift frequency, the average power of the output pulse laser of described fibre laser oscillator is greater than 100mW, output repetition rate is greater than 200MHz, the centre wavelength of output spectrum is 1040nm, the pulse duration of Output of laser is 1ps, after pulse shortener, can reach below 50fs.
As a kind of preferred version of the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier envelope phase shift frequency, described fibre laser oscillator also comprises dispersion control device, described dispersion control device comprise 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 envelope phase shift frequency, described oscillator also comprises inner chamber modulator, described inner chamber modulator is arranged in oscillator cavity, and described inner chamber modulator is electrooptical crystal modulator or Graphene modulator.
As a kind of preferred version of the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier envelope phase shift frequency, described fiber amplifier is amplified and is formed by single-stage or multi-stage fiber.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier envelope phase shift frequency, optical fiber spread spectrum device is for drawing bevel-type optical fiber, it is described that what draw that bevel-type monomode fiber uses is standard single-mode fiber, the mid portion of standard single-mode fiber is carried out to optical fiber and draw cone, final optical fiber draws the core diameter of wimble fraction to be less than or equal to 4 μ m, the length of drawing cone is 10cm left and right, 8.2 μ m when the core diameter at optical fiber two ends is bored for not drawing.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier envelope phase shift frequency, described relevant heterodyne beat device comprises dichroic mirror, frequency-doubling crystal, low pass filters, avalanche diode, condenser lens and some laser high reflective mirrors, described dichroic mirror is divided into short-wave band and long wave band two-way by the super continuous laser that incides dichroic mirror, in short-wave band light path, add light path time delay, two-way light turns back through high reflective mirror respectively, pass through again 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 short-wave band in light path and long wave band see through the transmission that stops other wave band by low pass filter again, after avalanche diode is placed on filter, for surveying the frequency doubled light of long wave band and the carrier envelope phase shift frequency signal that short-wave band beat frequency produces.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier envelope phase shift frequency, described front feedback circuit control phase device comprises frequency mixer and filter amplifier, described front feedback circuit control phase device is the frequency reference source signal mixing with the external stabilization converting through frequency synthesizer by carrier envelope phase shift frequency signal by frequency mixer, then after amplifier filter and amplification, exports to acousto-optic frequency shifters after filtering.
A kind of preferred version as the controlled low noise optical-fiber laser frequency comb device of above-mentioned carrier envelope phase shift frequency, phase-locked loop circuit is controlled repetition rate device and is also comprised Electro-Optical Sensor Set, and described photodetector is directly inputted to the high order harmonic component of the fibre laser oscillator repetition rate signal detecting in phase-locked loop circuit.
Beneficial effect of the present invention is: the application provides a kind of carrier envelope phase shift frequency controlled low noise optical-fiber laser frequency comb device, it comprises light channel structure and circuit structure, wherein, described light channel structure comprises fibre laser oscillator, acousto-optic frequency shifters, fiber amplifier, pulse shortener, optical fiber spread spectrum device and relevant heterodyne beat device; Described circuit structure comprises front feedback circuit control phase device and phase-locked loop circuit control repetition rate device.Wherein fibre laser oscillator can guarantee system long time running, and the stability of a system is better than solid laser oscillator; By introducing inner chamber modulator in net dispersion, oscillator in the chamber of optimization optical fiber oscillator and adopting the front technology such as acousto-optic frequency shifters of feeding back, realize low noise optical-fiber laser frequency comb device; The simultaneously use of acousto-optic frequency shifters and frequency mixer, carrier envelope phase shift frequency that can accuracy controlling optical frequency com, provides and has the frequency comb device steady in a long-term that fine phase regulates and controls thereby be embodied as the application such as optical frequency standard, attosecond science, nonlinear optics.
Accompanying drawing explanation
Fig. 1 is the controlled low noise optical-fiber laser frequency comb structural representation of the optical frequency of the embodiment of the present invention;
Fig. 2 is high repetition frequency, the ring cavity optical laser oscillator schematic diagram of the embodiment of the present invention;
Fig. 3 is the structural representation that draws 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 envelope phase shift Frequency Locking 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 control phase device; 8: phase-locked loop circuit is controlled repetition rate device;
11: dispersion control device; 12: inner chamber modulator; 13: fiber section; 14: polarization locked mode control 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 anti-mirror of third high; 68: first lens; 69: the second lens;
71: frequency synthesizer; 72: frequency mixer; 73: filter amplifier.
Embodiment
Below in conjunction with accompanying drawing and by embodiment, further illustrate technical scheme of the present invention.
As Figure 1-5, the invention provides the controlled low noise optical-fiber laser frequency comb device of a kind of carrier envelope phase shift frequency, comprise light channel structure and circuit structure, wherein, light channel structure comprises 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.
Circuit structure comprises front feedback circuit control phase device 7 and phase-locked loop circuit control repetition rate device 8;
Front feedback circuit control phase device 7 is for by f
ceosemaphore lock is exported to acousto-optic frequency shifters 2 after on the frequency reference source of external stabilization;
Front feedback circuit control phase device 7 is for controlling and change the carrier envelope phase shift frequency of femto-second laser pulse, the carrier envelope phase shift frequency measuring above and foreign frequency signal are carried out to mixing, the mixed frequency signal obtaining is through amplifying the driver of being directly defeated by acousto-optic frequency shifters 2, drive the first-order diffraction light frequency of acousto-optic frequency shifters 2 to change, thereby play effect stable and regulation and control femtosecond light comb carrier envelope phase shift frequency;
Phase-locked loop circuit is controlled the repetition rate phase-locked loop circuit of repetition rate device 8 for controlling the repetition rate of femtosecond pulse, uses photodetector detecting oscillations device output light to obtain repetition rate signal (f
rep), and this signal and external reference source signal are exported to phase-locked loop circuit simultaneously, by phase demodulation, proportional integral, process and obtain feedback control signal, then this control signal is driven to piezoelectric ceramic, flexible change chamber by piezoelectric ceramic is long, thereby repetition rate semaphore lock is arrived to stable foreign frequency reference source.
The average power of the output pulse laser of fibre laser oscillator 1 is greater than 100mW, and output repetition rate is greater than 200MHz, and the centre wavelength of output spectrum is 1040nm, and the pulse duration of Output of laser is 1ps left and right, through reaching below 50fs later.
Above-mentioned fibre laser oscillator 1 also comprises provides the pumping laser of energy light source 15.
More specifically, fibre laser oscillator 1 is high repetition frequency optical fiber oscillator, its structure as shown in Figure 2, employing be the mode locked mode of the nonlinear polarization rotation of standard.Whole optical fiber oscillator is divided into fiber section 13 and space optical path part, wherein fiber section 13 comprises gain fibre and general single mode fiber, the gain of the gain fibre using at wavelength 915nm place is greater than 350dB/m, and length is 20cm left and right, and other are all comprised of general single mode fiber; Space optical path is comprised of three parts such as dispersion control device 11, inner chamber modulator 12 and polarization locked mode control device 14, wherein dispersion control device 11 is that two reflecting gratings or transmission grating form, grating line density is every millimeter of 600 lines, blaze wavelength is 1040nm, and diffraction efficiency of grating is greater than 85%; That typical inner chamber modulator 12 uses is electrooptic modulator (EOM); Polarization locked mode control device 14 is comprised of half-wave plate, quarter-wave plate, polarization splitting prism and spatial light isolator.By regulate dispersion control device 11 can make whole fibre laser oscillator 1 locked mode operate at nearly zero or polarization dispersion near, by polarizer in careful adjusting chamber, at the vertical output end of polarization splitting prism, can realize stable mode-locked laser output, the repetition rate >200MHz of mode locking pulse, power output >100mW, centre wavelength is near 1040nm, and output pulse width is 1ps left and right.
The pulse of fibre laser oscillator 1 output is incided in acousto-optic frequency shifters 2 through condenser lens, wherein the negative first-order diffraction light of acousto-optic frequency shifters 2 is exported as follow-up laser frequency comb, and zero order diffracted light is coupled in fiber amplifier 3 by optical fiber collimator.Fiber amplifier 3 is amplified and is formed by single-stage or multi-stage fiber, the magnitude that the average laser power after final amplification reaches watt.
Optical fiber spread spectrum device 5 is for drawing bevel-type monomode fiber, it is described that what draw that bevel-type monomode fiber uses is standard single-mode fiber, the mid portion of standard single-mode fiber is carried out to optical fiber and draw cone, final optical fiber draws the core diameter of wimble fraction to be less than or equal to 4 μ m, the length of drawing cone is 10cm left and right, 8.2 μ m when the core diameter at optical fiber two ends is bored for not drawing, can guarantee that higher space optical coupling is to the coupling efficiency of optical fiber like this.
Further preferred, laser pulse after compression focuses on to be coupled to through non-spherical lens and draws in bevel-type highly nonlinear optical fiber, after highly nonlinear optical fiber spread spectrum, an octave of super continuum light spectral limit covering that obtains laser is even wider, through microcobjective collimation, obtain approximately parallel Laser output again, whole space optical coupling is greater than 60% to the efficiency of highly nonlinear optical fiber
Relevant heterodyne beat device 6 comprises dichroic mirror 61, frequency-doubling crystal 62, low pass filters 63, avalanche diode 64, condenser lens and some laser high reflective mirrors, dichroic mirror 61 is divided into short-wave band and long wave band two-way by the super continuum light spectrum laser that incides dichroic mirror 61, in short-wave band light path, add light path time delay, two-way light turns back through high reflective mirror respectively, through high reflective mirror and lens 68, focus on frequency-doubling crystal 62, frequency-doubling crystal 62 makes long wave band laser freuqency doubling, two-way light makes the frequency doubled light of short-wave band in light path and long wave band see through the transmission that stops other wave band by low pass filter 63 again, after avalanche diode 64 is placed on low pass filter 63, for surveying the frequency doubled light of long wave band and the f that short-wave band beat frequency produces
ceosignal.
Laser in the relevant concrete circulation way of heterodyne beat device is: super continuous laser incides on dichroic mirror 61, the wave-length coverage transmission of 61 couples of 550nm～950nm of dichroic mirror and wave-length coverage reflection to 1050nm～1500nm, 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, and the pulse laser of long wave band and short-wave band is overlapped in time; Two-way light separately overlaps and incides on 45 ° of anti-mirrors 67 of third high through the first high reflective mirror 66 inflection rear space, through first lens 68, focus on frequency-doubling crystal 62 again, the 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, and the first high reflective mirror 66 is that near-infrared laser high reflective mirror, the second high reflective mirror 65 are that the anti-mirror 67 of visible ray laser high reflective mirror, third high is silver-plated laser high reflective mirror.
The frequency-doubling crystal 62 of laser in relevant heterodyne beat device is by the laser freuqency doubling of long wave band, and wavelength composition identical in the short-wave band that the frequency doubled light of generation is composed with super continuum light carries out beat frequency, and the signal obtaining is f
ceosignal; Due to f
ceotherefore signal is to be carried in shortwave composition, need to use low pass filters 63 to filter other wavelength components and only allows and pass through compared with the shortwave composition of close limit, in order to avoid introduce too much noise.Meanwhile, use spectrum analyzer to observe f
ceosignal, by repeatedly regulating time delays line and the space optical path of laser in relevant heterodyne beat device to overlap, optimize the laser power of grating pair spacing in fibre laser oscillator 1 chamber, fiber amplifier 3 and incide the parameters such as laser polarization state of spectrum expanding unit 5, until f
ceothe signal to noise ratio of signal is higher than 30dB, till live width is 100kHz left and right.
Above-mentioned is all light path part of the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency, is below FEEDBACK CONTROL and the lock part of circuit:
Front feedback circuit control phase device comprises frequency synthesizer 71, frequency mixer 72 and filter amplifier 73, and front feedback circuit control phase device passes through frequency mixer 72 by f
ceothe frequency reference source signal mixing of the external stabilization of signal and 71 conversion of process frequency synthesizer, then after amplifier 73 filter and amplifications, export to acousto-optic frequency shifters 2 after filtering.
Phase-locked loop circuit is controlled repetition rate device 8 and is also comprised Electro-Optical Sensor Set, and described photodetector will detect the f of fibre laser oscillator 1
repthe high order harmonic component of signal is exported to the phase-locked loop circuit of laser oscillator and is controlled repetition rate device 8, repetition rate semaphore lock, to external stabilization frequency reference source, then is controlled to control signal that repetition rate device 8 obtains by phase-locked loop circuit and exported to fibre laser oscillator 1 and control its repetition rate.
The parameter that whole system need to lock has two---f
repsignal and f
ceosignal, wherein f
repthe lock mode of signal is as shown in Figure 1: use the output light of photodetector detection optical fiber laser oscillator 1, obtain f
repsignal is also input to its high order harmonic component phase-locked loop circuit and controls in repetition rate device 8, and stable external reference source is also input to phase-locked loop circuit and controls in repetition rate device 8 as with reference to standard, by f simultaneously
repsemaphore lock is to external reference source.
F
ceothe locking of signal mainly relies on the front feedback circuit lock-in techniques of acousto-optic frequency shifters 2 shift frequencies, and specifically principle and implementation step are as shown in Figure 5: first, and the f that relevant heterodyne beat device 6 is obtained
ceosignal and the external stabilization converting through frequency synthesizer 71 and the reference source signal f of changeable frequency
rcarry out mixing and obtain mixed frequency signal f
ceo+ f
r, by mixed frequency signal being directly loaded in acousto-optic frequency shifters 2 after filtering, amplification; Secondly, (optical frequency signal is f to incident laser
ceo+ n * f
rep) by acousto-optic frequency shifters 2, produce zero order diffracted light and negative first-order diffraction light, in the negative first-order diffraction light of acousto-optic frequency shifters 2, can carry the mixed frequency signal being carried in acousto-optic frequency shifters 2 :-(f
ceo+ f
r), therefore, the output frequency of the negative first-order diffraction light of acousto-optic frequency shifters 2 be optical frequency signal and mixed frequency signal and frequently, i.e. (f
ceo+ n * f
rep)-(f
ceo+ f
r)=n * f
rep-f
r, can learn in the optical frequency signal of bearing first-order diffraction light and not contain f
ceosignal, and only contain the repetition rate signal f having locked
repwith reference source signal f
r, when the frequency f changing through the external reference source of frequency synthesizer 71 conversion
rtime, will directly change the carrier envelope phase shift frequency of incident laser, thereby reach the controlled object of carrier envelope phase shift frequency to optical frequency com.
The controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency that the application provides has advantages of following concrete: first, the optical fiber oscilator system of high repetition frequency has guaranteed that the energy of single broach of Output of laser is higher, is more suitable for the application that needs high-energy broach; Secondly, by the optimization of net dispersion in optical fiber oscillator chamber, the methods such as the use of inner chamber modulator and front FEEDBACK CONTROL locking, produce low noise optical fiber frequency comb device; Again, by acousto-optic frequency shifters, add the mode of frequency mixer, can realize the carrier envelope phase shift frequency of optical frequency com accurately controlled; Finally, the optical fiber frequency comb device based on optical fiber oscillator makes whole system running more stable, for fields such as long-time measurements, has greater advantage.
Know-why of the present invention has below been described in conjunction with specific embodiments.These are described is in order to explain principle of the present invention, and can not be interpreted as by any way limiting the scope of the invention.Explanation based on herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present invention, within these modes all will fall into protection scope of the present invention.
Claims (9)
1. the low noise optical-fiber laser frequency comb device that carrier envelope phase shift frequency is controlled, comprise light channel structure and circuit structure, it is characterized in that, described light channel structure comprises 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 for generation of femto-second laser pulse, described femtosecond laser pulse is during to acousto-optic frequency shifters, zero order diffracted light enters fiber amplifier and carries out that at least single step of releasing is large, 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, and the laser after spread spectrum is incident in relevant heterodyne beat device and surveys and obtain carrier envelope phase shift frequency signal;
Described circuit structure comprises front feedback circuit control phase device and phase-locked loop circuit control repetition rate device;
Front feedback circuit control phase device is for controlling and change the carrier envelope phase shift frequency of femto-second laser pulse, the carrier envelope phase shift frequency measuring above and foreign frequency signal are carried out to mixing, the mixed frequency signal obtaining is through amplifying the driver of being directly defeated by acousto-optic frequency shifters, drive the first-order diffraction light frequency of acousto-optic frequency shifters to change, thereby play effect stable and regulation and control femtosecond light comb carrier envelope phase shift frequency;
Repetition rate phase-locked loop circuit is for controlling the repetition rate of femtosecond pulse, use photodetector detecting oscillations device output light to obtain repetition rate signal, and this signal and external reference source signal are exported to phase-locked loop circuit simultaneously, by phase demodulation, proportional integral, process and obtain feedback control signal, then this control signal is driven to piezoelectric ceramic, flexible change chamber by piezoelectric ceramic is long, thereby repetition rate semaphore lock is arrived to stable foreign frequency reference source.
2. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 1, it is characterized in that, the average power of the output laser pulse of described fibre laser oscillator is greater than 100mW, output repetition rate is greater than 200MHz, the centre wavelength of output spectrum is 1040nm, directly the pulse duration of Output of laser is 1ps, after pulse shortener, can reach below 50fs.
3. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 2, it is characterized in that, described fibre laser oscillator also comprises dispersion control device, described dispersion control device comprise reflecting grating to or transmission grating pair.
4. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 3, it is characterized in that, described fibre laser oscillator also comprises inner chamber modulator, described inner chamber modulator is arranged in oscillator cavity, and described inner chamber modulator is electrooptical crystal modulator or Graphene modulator.
5. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 1, is characterized in that, described fiber amplifier is amplified and formed by single-stage or multi-stage fiber.
6. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 1, it is characterized in that, optical fiber spread spectrum device is for drawing bevel-type optical fiber, it is described that what draw that bevel-type monomode fiber uses is standard single-mode fiber, the mid portion of standard single-mode fiber is carried out to optical fiber and draw cone, final optical fiber draws the core diameter of wimble fraction to be less than or equal to 4 μ m, and the length of drawing cone is 10cm left and right, 8.2 μ m when the core diameter at optical fiber two ends is bored for not drawing.
7. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 1, it is characterized in that, described relevant heterodyne beat device comprises dichroic mirror, frequency-doubling crystal, low pass filters, avalanche diode, condenser lens and some laser high reflective mirrors, described dichroic mirror is divided into short-wave band and long wave band two-way by the super continuous laser that incides dichroic mirror, in short-wave band light path, add light path time delay, two-way light turns back through high reflective mirror respectively, pass through again high reflective mirror and lens focus to frequency-doubling crystal, frequency-doubling crystal makes long wave band laser freuqency doubling, after two-way optical alignment, by low pass filter, make the frequency doubled light of short-wave band in light path and long wave band see through the transmission that stops other wave band again, after avalanche diode is placed on filter, for surveying the frequency doubled light of long wave band and the carrier envelope phase shift frequency signal that short-wave band beat frequency produces.
8. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 1, it is characterized in that, described front feedback circuit control phase device comprises frequency synthesizer, frequency mixer and filter amplifier, described front feedback circuit control phase device is the frequency reference source signal mixing with the external stabilization converting through frequency synthesizer by carrier envelope phase shift frequency signal by frequency mixer, then after amplifier filter and amplification, exports to acousto-optic frequency shifters after filtering.
9. the controlled low noise optical-fiber laser frequency comb device of carrier envelope phase shift frequency according to claim 1, it is characterized in that, phase-locked loop circuit is controlled repetition rate device and is also comprised Electro-Optical Sensor Set, and described photodetector is directly inputted to the high order harmonic component of the fibre laser oscillator repetition rate signal detecting in phase-locked loop circuit.
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