CN105261927A - Ultra-short pulse laser and method for obtaining long-distance transmission laser - Google Patents
Ultra-short pulse laser and method for obtaining long-distance transmission laser Download PDFInfo
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- CN105261927A CN105261927A CN201510795060.1A CN201510795060A CN105261927A CN 105261927 A CN105261927 A CN 105261927A CN 201510795060 A CN201510795060 A CN 201510795060A CN 105261927 A CN105261927 A CN 105261927A
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Abstract
The invention discloses an ultra-short pulse laser and a method for obtaining long-distance transmission laser. The ultra-short pulse laser comprises a mode-locking oscillator, a stretcher, two amplifiers, a compressor and a controller that are arranged in the sequence of the amplifier, the stretcher, the amplifier and the compressor based on the transmission path of the laser generated by the mode-locking oscillator; the controller is connected with the stretcher or the compressor; the stretcher or the compressor is controlled through the controller to obtain outgoing laser with negative initial chirp value; the atmosphere has the positive dispersion, so that the laser is compressed constantly when the laser is transmitted in the atmosphere, and the peak power is increased constantly; by controlling the initial chirp value, a self-focusing threshold value is reached in the position of a target distance, and a smaller light spot and a higher power density are obtained in the position close to the self-focusing point, so that the purposes of the high power density in a long distance and a controllable transmission distance are realized.
Description
Technical field
The present invention relates to superpower laser technical field, in particular to a kind of method of ultrashort pulse laser and acquisition long range propagation laser.
Background technology
When high power ultra-short pulse laser transmits in an atmosphere, when pulse laser peak power reaches self focusing threshold, self-focusing effect will be produced.Self-focusing effect can compensate diffraction effect, makes laser beam focusing to very little space scale, thus reaches very high power density, even can puncture air in transmitting procedure.After puncturing air, laser is difficult to continue high efficiency of transmission.The self-focusing effect of ultra-short pulse laser can overcome diffraction effect during high power laser light propagation in atmosphere, obtains very high power density, but also limit the transmission range of laser simultaneously.
Summary of the invention
For above-mentioned problems of the prior art, the invention provides a kind of method of ultrashort pulse laser and acquisition long range propagation laser, the ultra-short pulse laser that laser of the present invention exports has negative initial chirp amount, because air has positive dispersion, constantly compressed when this laser transmits in an atmosphere, peak power constantly increases, by controlling initial chirp amount, in target range, place reaches self focusing threshold, less facula area and higher power density is obtained at self focusing near focal point, thus reach and realizing high power density at a distance and the controlled object of transmission range.
For achieving the above object, the invention provides following technical scheme:
A kind of ultrashort pulse laser, comprise: mode locking oscillator, stretcher, 2 amplifiers, compressor reducer and controllers, the transmission path of the laser produced according to described mode locking oscillator be arranged in order into: amplifier, stretcher, amplifier and compressor reducer, described controller is connected with described stretcher or compressor reducer.
Further, described stretcher be chirped fiber grating, concave grating to or body grating.
Further, described compressor reducer be concave grating to or body grating.
A kind of ultrashort pulse laser, comprise: mode locking oscillator, amplifier, chirped modulation device and controller, the transmission path of the laser produced according to described mode locking oscillator be arranged in order into: amplifier and chirped modulation device, described controller is connected with chirped modulation device.
Further, described chirped modulation device be concave grating to or body grating.
Separately, the present invention also provides a kind of method utilized as above-mentioned ultrashort pulse laser acquisition long range propagation laser, by controller, stretcher, compressor reducer or chirped modulation device are controlled, obtain the shoot laser with negative initial chirp amount, i.e. long range propagation laser.
Further, described stretcher be chirped fiber grating, concave grating to or body grating, described controller to the control method of stretcher is: for chirped fiber grating, and described controller is by controlling the temperature of chirped fiber grating or stress carries out Dispersion managed; For concave grating pair, described controller carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, described controller carries out Dispersion managed by the temperature of control volume grating.
Controller can be temperature controller, pressure controller or distance controller, be made up of heating and cooling device, dynamo-electric pressurizer and displacement driver and transducer thereof respectively, can control action be played to the temperature of stretcher, compressor reducer or chirped modulation device, pressure or displacement.
Further, described compressor reducer be concave grating to or body grating, described controller to the control method of compressor reducer is: for concave grating pair, and described controller carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, described controller carries out Dispersion managed by the temperature of control volume grating.
Further, described chirped modulation device be concave grating to or body grating, described controller to the control method of compressor reducer of warbling is: for concave grating pair, and described controller carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, described controller carries out Dispersion managed by the temperature of control volume grating.
Beneficial effect of the present invention is as follows:
1, the present invention uses controller to control the initial chirp amount of outgoing pulse laser, its pulse duration is made to have certain broadening, reduce the peak power of primary laser pulse, because air has positive dispersion interaction, pulse laser will constantly compress in propagation in atmosphere process, by the initial chirp amount of regulation and control outgoing pulse laser, can control impuls laser peak power with the Changing Pattern of transmission range, laser peak power is constantly strengthened with transmission range, reach self focusing threshold in target location, obtain the highest power density at self focusing near focal point;
2, the present invention's only access control device in the laser, can realize the control of the pulse laser initial chirp amount to outgoing, thus make pulse laser can transfer to the target place of random length distance efficiently, and overall structure is simple, is skillfully constructed.
Accompanying drawing explanation
Fig. 1 is the laser structure schematic diagram of embodiments of the invention one;
Fig. 2 is the laser structure schematic diagram of embodiments of the invention two;
Fig. 3 is the laser structure schematic diagram of embodiments of the invention three;
Fig. 4 is the laser structure schematic diagram of embodiments of the invention four.
In figure: 1-mode locking oscillator, 2-amplifier, 3-stretcher, 4-amplifier, 5-compressor reducer, 6-controller, 7-long range propagation laser, 8-chirped modulation device.
Embodiment
Technical scheme of the present invention is understood better in order to make those skilled in the art; below in conjunction with accompanying drawing of the present invention; clear, complete description is carried out to technical scheme of the present invention; based on the embodiment in the application; other roughly the same embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all should belong to the scope of the application's protection.
Embodiment one:
As shown in Figure 1, a kind of ultrashort pulse laser, comprise: mode locking oscillator 1, stretcher 3, amplifier 2, amplifier 4, compressor reducer 5 and controller 6, the transmission path of laser that produces according to mode locking oscillator 1 is arranged in order as amplifier 2, stretcher 3, amplifier 4 and compressor reducer 5, controller 6 is connected with stretcher 3, by the initial chirp of stretcher 3 and compressor reducer 5 control impuls laser.Stretcher 3 be chirped fiber grating, concave grating to or body grating, by the dispersion interaction of grating, broadening is carried out to the pulse duration through the preliminary pulse laser amplified, meanwhile, the peak energy of pulse laser reduces, so that amplify fully in amplifier 4.Compressor reducer 5 be concave grating to or body grating, oppositely utilize the dispersion interaction of grating, the pulse laser after amplifier 4 is carried out the compression of pulse duration, meanwhile, the peak power of pulse laser obtains and improves.The present invention's only access control device 6 in the laser, can realize the control of the pulse laser initial chirp amount to outgoing, thus make pulse laser can transfer to the target place of random length distance efficiently, and overall structure is simple, is skillfully constructed.
Common ultrashort pulse laser provides positive dispersion interaction by stretcher 3 paired pulses laser, namely gives pulse laser positive value of warbling; Compressor reducer 5 paired pulses laser provides negative dispersion interaction, namely give pulse laser negative value of warbling, in order to realize the as far as possible narrow Laser output of pulsewidth, stretcher 3 and compressor reducer 5 need to have strict dispersion coupling, dispersion values is now matching value, and namely the value of warbling of shoot laser is zero.Present inventor finds, have negative initial chirp value if make by the pulse laser of laser emitting, then constantly compressed when this pulse laser transmits in an atmosphere, its self focusing position is distal to the self focusing position of the pulse laser of prior art.Simultaneously, the size of shoot laser initial chirp value is determined by self focusing focus desired location, atmospheric dispersion coefficient, atmosphere attenuation coefficien, Output of laser parameter and compressor reducer parameter, so just can by the target location of pulse laser due to optional position, by regulating and controlling the initial chirp value of shoot laser, the self focusing focus of shoot laser is made to be positioned near target location, in the high power density realizing shoot laser at a distance and transmission range is controlled.
A kind of method utilizing ultrashort pulse laser described above to obtain long range propagation laser, controlled by controller 6 pairs of stretchers 3, stretcher 3 is made to provide the dispersion measure being less than matching value, and compressor reducer 5 still provides the dispersion measure of former matching value, acquisition like this has the shoot laser of negative initial chirp amount, i.e. long range propagation laser 7, this laser reaches self focusing threshold in target location, obtains the highest power density at self focusing near focal point.
Stretcher 3 be chirped fiber grating, concave grating to or body grating, the control method of controller 6 pairs of stretchers 3 is: for chirped fiber grating, and controller 6 is by controlling the temperature of chirped fiber grating or stress carries out Dispersion managed; For concave grating pair, controller 6 carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, controller 6 carries out Dispersion managed by the temperature of control volume grating.
The present invention uses controller 6 to control the initial chirp amount of outgoing pulse laser, its pulse duration is made to have certain broadening, reduce the peak power of primary laser pulse, pulse laser will constantly compress in propagation in atmosphere process, by the initial chirp amount of regulation and control outgoing pulse laser, can control impuls laser peak power with the Changing Pattern of transmission range, laser peak power is constantly strengthened with transmission range, reach self focusing threshold in target location, obtain the highest power density at self focusing near focal point.
Embodiment two:
The part identical with embodiment one repeats no more, unlike:
As shown in Figure 2, a kind of ultrashort pulse laser, comprise: mode locking oscillator 1, stretcher 3, amplifier 2, amplifier 4, compressor reducer 5 and controller 6, the transmission path of laser that produces according to mode locking oscillator 1 is arranged in order as amplifier 2, stretcher 3, amplifier 4 and compressor reducer 5, controller 6 is connected with compressor reducer 5, by the initial chirp of stretcher 3 and compressor reducer 5 control impuls laser.Stretcher 3 be chirped fiber grating, concave grating to or body grating, by the dispersion interaction of grating, broadening is carried out to the pulse duration through the preliminary pulse laser amplified, meanwhile, the peak energy of pulse laser reduces, so that amplify fully in amplifier 4.Compressor reducer 5 be concave grating to or body grating, the anti-phase dispersion interaction utilizing grating, carries out the compression of pulse duration by the pulse laser after amplifier 4, meanwhile, the peak energy of pulse laser improves, so that pulse laser is at the long range propagation in space.
A kind of method utilizing ultrashort pulse laser described above to obtain long range propagation laser, controlled by controller 6 pairs of compressor reducers 5, compressor reducer 5 is made to provide the dispersion measure being greater than matching value, and stretcher 3 still provides the dispersion measure of former matching value, acquisition like this has the shoot laser of negative initial chirp amount, i.e. long range propagation laser 7, this laser reaches self focusing threshold in target location, obtains the highest power density at self focusing near focal point.
Compressor reducer 5 be concave grating to or body grating, the control method of controller 6 pairs of compressor reducers 5 is: for concave grating pair, and controller 6 carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, controller 6 carries out Dispersion managed by the temperature of control volume grating.
Embodiment three:
As shown in Figure 3, a kind of ultrashort pulse laser, comprise: mode locking oscillator 1, amplifier 2, chirped modulation device 8 and controller 6, the transmission path of laser produced according to mode locking oscillator 1 be arranged in order into: amplifier 2 and chirped modulation device 8, controller 6 is connected with chirped modulation device 8.Chirped modulation device 8 be concave grating to or body grating, laser is after chirped modulation device 8, can with certain initial chirp value outgoing, the present embodiment regulates and controls the initial chirp value of pulse laser by controller 6, makes it be negative value relative to the initial chirp value of prior art, in transmitting procedure, long range propagation laser 7 is atmospheric compressed, reach self focusing threshold in target location, obtain the highest power density at self focusing near focal point, namely realize the long range propagation of pulse laser.Chirped modulation device 8 be concave grating to or body grating, the control method of controller 6 pairs of chirped modulation devices 8 is: for concave grating pair, and controller 6 carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, controller 6 carries out Dispersion managed by the temperature of control volume grating.
Embodiment four:
As shown in Figure 4, a kind of ultrashort pulse laser, comprise: mode locking oscillator 1, stretcher 3, amplifier 2, amplifier 4, compressor reducer 5, controller 6 and chirped modulation device 8, the transmission path of laser that produces according to mode locking oscillator 1 is arranged in order as amplifier 2, stretcher 3, amplifier 4, compressor reducer 5 and chirped modulation device 8, controller 6 is connected with chirped modulation device 8, by the initial chirp of chirped modulation device 8 control impuls laser.Remainder is identical with embodiment one, does not repeat them here.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (9)
1. a ultrashort pulse laser, it is characterized in that, comprise: mode locking oscillator, stretcher, 2 amplifiers, compressor reducer and controllers, the transmission path of the laser produced according to described mode locking oscillator be arranged in order into: amplifier, stretcher, amplifier and compressor reducer, described controller is connected with described stretcher or compressor reducer.
2. ultrashort pulse laser according to claim 1, is characterized in that, described stretcher be chirped fiber grating, concave grating to or body grating.
3. ultrashort pulse laser according to claim 2, is characterized in that, described compressor reducer be concave grating to or body grating.
4. a ultrashort pulse laser, it is characterized in that, comprise: mode locking oscillator, amplifier, chirped modulation device and controller, the transmission path of the laser produced according to described mode locking oscillator be arranged in order into: amplifier and chirped modulation device, described controller is connected with chirped modulation device.
5. ultrashort pulse laser according to claim 4, is characterized in that, described chirped modulation device be concave grating to or body grating.
6. one kind utilizes the method for described ultrashort pulse laser acquisition long range propagation laser as arbitrary in claim 1-5, it is characterized in that, by controller, stretcher, compressor reducer or chirped modulation device are controlled, obtain the shoot laser with negative initial chirp amount, i.e. long range propagation laser.
7. the method for acquisition long range propagation laser according to claim 6, it is characterized in that, described stretcher be chirped fiber grating, concave grating to or body grating, described controller to the control method of stretcher is: for chirped fiber grating, and described controller carries out Dispersion managed by the temperature or stress controlling chirped fiber grating; For concave grating pair, described controller carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, described controller carries out Dispersion managed by the temperature of control volume grating.
8. the method for acquisition long range propagation laser according to claim 6, it is characterized in that, described compressor reducer be concave grating to or body grating, described controller to the control method of compressor reducer is: for concave grating pair, and described controller carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, described controller carries out Dispersion managed by the temperature of control volume grating.
9. the method for acquisition long range propagation laser according to claim 6, it is characterized in that, described chirped modulation device be concave grating to or body grating, described controller to the control method of compressor reducer of warbling is: for concave grating pair, and described controller carries out Dispersion managed by the spacing of chain of command grating pair; For body grating, described controller carries out Dispersion managed by the temperature of control volume grating.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107976426A (en) * | 2017-11-01 | 2018-05-01 | 北京空间机电研究所 | A kind of constituent of atomsphere detection system based on chevilled silk laser |
| CN109682467A (en) * | 2019-01-23 | 2019-04-26 | 广东朗研科技有限公司 | Infrared single photon frequency upooaversion detection system based on the inclined lock-out pulse pumping of all risk insurance |
| CN111509549A (en) * | 2020-04-10 | 2020-08-07 | 中国科学院上海光学精密机械研究所 | High-peak power femtosecond laser negative/positive chirp pulse cascade amplification system |
| CN111555101A (en) * | 2020-05-20 | 2020-08-18 | 中国科学技术大学 | Device for generating laser pulse train with adjustable frequency chirp |
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| US20110002691A1 (en) * | 2009-07-01 | 2011-01-06 | Calmar Optcom, Inc. | Optical pulse compressing based on chirped fiber bragg gratings for pulse amplification and fiber lasers |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976426A (en) * | 2017-11-01 | 2018-05-01 | 北京空间机电研究所 | A kind of constituent of atomsphere detection system based on chevilled silk laser |
| CN109682467A (en) * | 2019-01-23 | 2019-04-26 | 广东朗研科技有限公司 | Infrared single photon frequency upooaversion detection system based on the inclined lock-out pulse pumping of all risk insurance |
| CN111509549A (en) * | 2020-04-10 | 2020-08-07 | 中国科学院上海光学精密机械研究所 | High-peak power femtosecond laser negative/positive chirp pulse cascade amplification system |
| CN111509549B (en) * | 2020-04-10 | 2021-07-06 | 中国科学院上海光学精密机械研究所 | High-peak power femtosecond laser negative/positive chirp pulse cascade amplification system |
| CN111555101A (en) * | 2020-05-20 | 2020-08-18 | 中国科学技术大学 | Device for generating laser pulse train with adjustable frequency chirp |
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