CN104614915A - Laser pulse compressing and widening system - Google Patents
Laser pulse compressing and widening system Download PDFInfo
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- CN104614915A CN104614915A CN201410814539.0A CN201410814539A CN104614915A CN 104614915 A CN104614915 A CN 104614915A CN 201410814539 A CN201410814539 A CN 201410814539A CN 104614915 A CN104614915 A CN 104614915A
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- laser pulse
- photoswitch
- broadening
- pulse compression
- optical fiber
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/365—Non-linear optics in an optical waveguide structure
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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention provides a laser pulse compressing and widening system comprising an optical switch, an optical amplifier, a dispersive medium, a delay optical fiber, an optical coupler and an on-off controller. The optical switch is provided with an input port a, two output ports b, c and a control port. The input end of the optical amplifier is connected with the output port b of the optical switch. One end of the dispersive medium is connected with the output end of the optical amplifier. One end of the delay optical fiber is connected with other end of the dispersive medium. One input end of the optical fiber is connected with the other end of the delay optical fiber. The output end of the optical coupler is connected with the input port a of the optical switch. The control port of the on-off controller is connected with the control port of the optical switch. The laser pulse compressing and widening system can break through the limitation that the dispersion coefficient of a traditional dispersive medium is not large enough.
Description
Technical field
The invention belongs to photoelectron technical field, is more specifically a kind of Laser pulse compression and broadening system.
Background technology
In recent years, one in laser science technology most conspicuous achievement is the fast development of Ultra Short Laser Pulse Technology.Its widespread use, has directly driven the research of physics, chemistry, biology, material and information science to enter microcosmic ultrafast process field, and has started some brand-new research fields, such as femtochemistry, Quantum control chemistry, semiconductor coherent swpectrum etc.Owing to there is effect of dispersion, can there is the distortion that distorts in laser pulse, the width of laser pulse is broadened in Optical Fiber Transmission, thus produce intersymbol interference, add the bit error rate.The transmission medium with negative dispersion coefficient is added in optical fiber link, can compensated optical fiber dispersion adverse effect that laser signal is produced.Conversely, make full use of dispersion characteristics, also can compress laser pulse and broadening process, visible dispersion plays vital effect to compression and spread laser pulse.At present, owing to being limited to the factors such as technique, dispersive medium can only reach thousand or hundred ps/nm/km magnitudes as abbe numbers such as dispersive optical fiber, Chirp Bragg gratings, which greatly limits the compression to laser pulse and broadening effect.
Summary of the invention
In view of this, the object of the invention is to, a kind of Laser pulse compression and broadening system are provided, to break through the restriction large not of traditional colour dispersion media abbe number.
The present invention proposes a kind of Laser pulse compression and broadening system, it is characterized in that, comprising:
One photoswitch, this photoswitch has an input port a and two output port b, c and a control port;
One image intensifer, the input end of this image intensifer is connected with the output port b of photoswitch;
One dispersive medium, one end of this dispersive medium is connected with the output terminal of image intensifer;
One time delay optical fiber, one end of this time delay optical fiber is connected with the other end of dispersive medium;
One photo-coupler, an input end of this photo-coupler is connected with the other end of time delay optical fiber, and the output terminal of this photo-coupler is connected with the input port a of photoswitch;
One on-off controller, the control port of this on-off controller is connected with the control port of photoswitch.
A kind of Laser pulse compression of the present invention and broadening system, controlled by photoswitch, amplified by the laser pulse of input iterative cycles in the ring with dispersive medium, thus obtain repeatedly dispersion, thus breach the restriction large not of traditional colour dispersion media abbe number.This system has the controlled abbe number of size, can realize the ultra-narrow compression to laser pulse and ultra-wide broadening.
Accompanying drawing explanation
For further illustrating technology contents of the present invention, below in conjunction with drawings and Examples, the invention will be further described, wherein:
Fig. 1 is the structural representation of a kind of Laser pulse compression of the present invention and broadening system.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.It should be noted that, in accompanying drawing or instructions describe, similar or identical part all uses identical figure number.The implementation not illustrating in accompanying drawing or describe is form known to a person of ordinary skill in the art in art.In addition, although herein can providing package containing the demonstration of the parameter of particular value, should be appreciated that, parameter without the need to definitely equaling corresponding value, but can be similar to corresponding value in acceptable error margin or design constraint.
The invention provides a kind of Laser pulse compression and broadening system.This system utilizes the output port of on-off controller to photoswitch to switch, repeatedly circulate in the ring that the laser pulse inputted is formed in photoswitch, image intensifer, dispersive medium and time delay optical fiber, repeatedly amplify, repeatedly dispersion, thus achieve the ultra-narrow of laser pulse compressed and ultra-wide broadening.
In one exemplary embodiment of the present invention, provide a kind of Laser pulse compression and broadening system.Please refer to Fig. 1, this system comprises:
One photoswitch 1, this photoswitch 1 has an input port a and two output port b, c and a control port;
One image intensifer 2, the input end of this image intensifer 2 is connected with the output port b of photoswitch 1;
One dispersive medium 3, one end of this dispersive medium 3 is connected with the output terminal of image intensifer 2;
One time delay optical fiber 4, one end of this time delay optical fiber 4 is connected with the other end of dispersive medium 3;
One photo-coupler 5, an input end of this photo-coupler 5 is connected with the other end of time delay optical fiber 4, and the output terminal of this photo-coupler 5 is connected with the input end a of photoswitch;
One on-off controller 6, the control port of this on-off controller 6 is connected with the control port of photoswitch 1.
Wherein be connected by standard single-mode fiber between photoswitch 1, image intensifer 2, dispersive medium 3, time delay optical fiber 4, photo-coupler 5.
Wherein be connected by standard radio frequency connecting line between photoswitch 1 with on-off controller 6.
The principle of a kind of Laser pulse compression of the present invention and broadening system is as follows:
One laser pulse outputs to the input end a of photoswitch 1 by photo-coupler 5, and the control signal that now on-off controller 6 exports is low level signal, makes the on off state of photoswitch 1 be a to b.Wherein, the control signal of on-off controller 6 output and the laser pulse of input answer clock synchronous.Laser pulse enters image intensifer 2 from photoswitch b output terminal and carries out power amplification, then enters in dispersive medium 3.When the abbe number of dispersive medium 3 adopted be on the occasion of time, present system plays the effect of broadening to laser pulse; When the abbe number of the dispersive medium 3 adopted is negative value, present system plays the effect of compression to laser pulse.Wherein dispersive medium 3 can be dispersive optical fiber or Chirp Bragg grating, and its bandwidth should be greater than the bandwidth of the laser pulse of input.Compressed/laser pulse of broadening enters into the input end a again being reached photoswitch 1 after time delay optical fiber 4 carries out time delay by photo-coupler 5.If the control signal that now on-off controller 6 exports is still low level signal, the b output terminal from photoswitch 1 exports and again enters in dispersive medium 3 and carries out compressing/broadening by laser pulse, so goes round and begins again.When the laser pulse through repeatedly compression/broadening enters into the input end a of photoswitch 1, if the control signal that now on-off controller 6 exports is high level signal, the on off state of photoswitch 1 transfers a to c to, thus is exported from the c port of photoswitch 1 by the laser pulse through repeatedly compression/broadening.Wherein, the delay time of time delay optical fiber 4 pairs of laser pulses should much larger than state of the opening the light switching time of photoswitch 1, and the gain of image intensifer 2 pairs of laser pulses should be greater than the loss of whole system to laser pulse.
So far, by reference to the accompanying drawings a kind of Laser pulse compression of the present invention and broadening system have been described in detail.Describe according to above, those skilled in the art should have a kind of Laser pulse compression of the present invention and broadening system and have clearly been familiar with.
In addition, the above-mentioned definition to each element and method is not limited in various concrete structures, shape or the mode mentioned in embodiment, and those of ordinary skill in the art can replace it with knowing simply.
In sum, a kind of Laser pulse compression of the present invention and broadening system, controlled by photoswitch, amplified by the laser pulse of input iterative cycles in the ring with dispersive medium, thus obtain repeatedly dispersion, thus breach the restriction large not of traditional colour dispersion media abbe number.This system has the controlled abbe number of size, can realize the ultra-narrow compression to laser pulse and ultra-wide broadening.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. Laser pulse compression and a broadening system, comprising:
One photoswitch, this photoswitch has an input port a and two output port b, c and a control port;
One image intensifer, the input end of this image intensifer is connected with the output port b of photoswitch;
One dispersive medium, one end of this dispersive medium is connected with the output terminal of image intensifer;
One time delay optical fiber, one end of this time delay optical fiber is connected with the other end of dispersive medium;
One photo-coupler, an input end of this photo-coupler is connected with the other end of time delay optical fiber, and the output terminal of this photo-coupler is connected with the input port a of photoswitch;
One on-off controller, the control port of this on-off controller is connected with the control port of photoswitch.
2. Laser pulse compression according to claim 1 and broadening system, is be connected by standard single-mode fiber between time delay optical fiber and photo-coupler at wherein said photoswitch, image intensifer, dispersive medium.
3. Laser pulse compression according to claim 1 and broadening system, wherein said photoswitch be connected by standard radio frequency connecting line between on-off controller.
4. Laser pulse compression according to claim 1 and broadening system, the clock synchronous of the laser pulse that the control signal that wherein said on-off controller exports and described Laser pulse compression and broadening system input.
5. Laser pulse compression according to claim 1 and broadening system, wherein said dispersive medium is dispersive optical fiber or Chirp Bragg grating, and its band is wider than the bandwidth of the laser pulse that described Laser pulse compression and broadening system input.
6. Laser pulse compression according to claim 5 and broadening system, the abbe number of wherein said dispersive medium be on the occasion of time, described Laser pulse compression and broadening system play the effect of broadening to laser pulse; When the abbe number of described dispersive medium is negative value, described Laser pulse compression and broadening system play the effect of compression to laser pulse.
7. Laser pulse compression according to claim 1 and broadening system, wherein said time delay optical fiber is to the open the light state switching time of the delay time of laser pulse much larger than photoswitch.
8. Laser pulse compression according to claim 1 and broadening system, the gain of wherein said image intensifer to laser pulse is greater than described Laser pulse compression and broadening system to the loss of laser pulse.
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| CN201410814539.0A CN104614915B (en) | 2014-12-24 | 2014-12-24 | Laser pulse compression and broadening system |
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| CN201410814539.0A CN104614915B (en) | 2014-12-24 | 2014-12-24 | Laser pulse compression and broadening system |
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| CN104614915B CN104614915B (en) | 2017-06-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064946A (en) * | 2017-05-08 | 2017-08-18 | 哈尔滨工业大学 | All-optical pulse for target acquisition in continuous scattering medium compresses laser radar system and distance-finding method |
| CN109818237A (en) * | 2019-03-28 | 2019-05-28 | 上海交通大学 | Ultrashort laser pulse orthopedic systems based on fiber optic loop circular modulating time grating |
| CN111769428A (en) * | 2020-06-01 | 2020-10-13 | 浙江大学 | All-fiber high-energy pulse regeneration amplification device and method based on 2 x 3 optical switch |
| CN115275741A (en) * | 2022-07-22 | 2022-11-01 | 深圳技术大学 | Pulse stretching device, pulse stretching system and laser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064946A (en) * | 2017-05-08 | 2017-08-18 | 哈尔滨工业大学 | All-optical pulse for target acquisition in continuous scattering medium compresses laser radar system and distance-finding method |
| CN107064946B (en) * | 2017-05-08 | 2019-08-23 | 哈尔滨工业大学 | All-optical pulse for target acquisition in continuous scattering medium compresses laser radar system and distance measuring method |
| CN109818237A (en) * | 2019-03-28 | 2019-05-28 | 上海交通大学 | Ultrashort laser pulse orthopedic systems based on fiber optic loop circular modulating time grating |
| CN109818237B (en) * | 2019-03-28 | 2021-01-01 | 上海交通大学 | Ultrashort laser pulse shaping system based on optical fiber ring circulation modulation time grating |
| CN111769428A (en) * | 2020-06-01 | 2020-10-13 | 浙江大学 | All-fiber high-energy pulse regeneration amplification device and method based on 2 x 3 optical switch |
| CN115275741A (en) * | 2022-07-22 | 2022-11-01 | 深圳技术大学 | Pulse stretching device, pulse stretching system and laser |
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| CN104614915B (en) | 2017-06-23 |
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