CN112928592A - Liquid laser compressor with continuously tunable output pulse width - Google Patents
Liquid laser compressor with continuously tunable output pulse width Download PDFInfo
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- CN112928592A CN112928592A CN202110341083.0A CN202110341083A CN112928592A CN 112928592 A CN112928592 A CN 112928592A CN 202110341083 A CN202110341083 A CN 202110341083A CN 112928592 A CN112928592 A CN 112928592A
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- brillouin scattering
- stimulated brillouin
- pulse width
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- 239000007788 liquid Substances 0.000 title claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 32
- 238000007906 compression Methods 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 6
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 claims description 2
- 230000021615 conjugation Effects 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1028—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1317—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention relates to a liquid laser compressor with continuously tunable output pulse width. The compressor comprises a pumping light source, a temperature control system and a stimulated Brillouin scattering compression pool, and the temperature of a medium in the stimulated Brillouin scattering compression pool is controlled through the temperature control system. The compressor comprises a pumping light source (1), a beam isolation system (2), a beam separation system (3), a temperature control module (4), a TEC refrigerating plate (5), a stimulated Brillouin scattering compression pool (6) and a concave reflector (7) which are sequentially arranged. The Brillouin parameter of the liquid Brillouin medium in the stimulated Brillouin scattering compression pool (6) changes along with the temperature, and the temperature of the medium pool is controlled by a temperature control system to realize the characteristic of continuously adjustable output pulse width. The pulse width adjustable compressor provided by the invention has the characteristics of simple and reliable structure, subnanosecond output, high load, phase conjugation and very high engineering applicability and commercial value.
Description
Technical Field
The invention relates to the technical field of short pulse laser compressors, in particular to a liquid laser compressor capable of continuously adjusting output pulse width through temperature control.
Background
The development of the high-energy ultrashort pulse laser technology obviously promotes the development of the fields of impact dynamics, high-precision laser detection, laser medical treatment and the like. With the increase of the requirements of the related field and the complication of application scenarios, the tunable requirement on the laser output pulse width is also increasingly increased. The following three solutions for implementing tunable pulsed laser are available, and all of the three solutions have great disadvantages, which will be described below.
The first method is an extra-cavity chopping method, namely, output pulses are chopped by a chopper and a Pockels box, so that the pulse width is compressed. The method has extremely low energy conversion efficiency, is limited by a Pockels box driving power supply, can only be applied to long pulse with the pulse length being more than nanosecond, and cannot be applied to the field of short pulse.
The second is that the output pulse width is adjustable by changing the length of the resonant cavity, the resonant cavity needs to be adjusted continuously when the scheme is used, the engineering applicability is poor, and the popularization is difficult.
The third method for adjusting the pulse width is realized by SBS pulse width compression technology, such as "utility model patent No.: 95212767.9, patent name: the technical scheme of the pulse width tunable YAG laser also needs to continuously change structural parameters such as SBS pool distance and the like to realize pulse width adjustability, so that on one hand, engineering is difficult to realize, on the other hand, the adjustment precision is low, and the adjustment range is limited.
To prior art not enough, the utility model provides a realize the SBS compressor that subnanosecond pulse can be tuned through temperature control system.
Disclosure of Invention
The invention aims to overcome the defects of low efficiency, poor engineering adaptability and difficulty in realizing continuous adjustment of the conventional laser compressor, and provides a pulse-width-tunable liquid laser compressor which is simple in structure, high in adjustment precision and strong in engineering adaptability. The compressor realizes continuous adjustment of large-energy sub-nanosecond pulse width.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the compressor is characterized by further comprising a temperature control system and a stimulated Brillouin scattering compression pool, and the temperature of a medium in the stimulated Brillouin scattering compression pool is controlled through the temperature control system. The Brillouin parameter of the liquid Brillouin medium in the stimulated Brillouin scattering compression pool (6) changes along with the temperature, and the continuous change of the temperature of the medium pool is controlled by a temperature control system so as to realize the continuous adjustable characteristic of the output pulse width.
In the scheme, the media in the stimulated Brillouin scattering compression pool (6) are liquid fluorocarbon compounds such as FC-72, FC-77, FC-87, FC-84, FC-70 and water H2O, the phonon life of the liquid medium in the stimulated Brillouin scattering compression pool is inversely proportional to the viscosity coefficient, and the temperature is continuously changed through a temperature control system, so that the phonon life of the medium is continuously changed. The output pulse width can be continuously adjusted by controlling the temperature change of the liquid in the pool.
The compressor also comprises a light beam isolation system (2) and a light beam separation system (3) which are sequentially arranged, and the pumping light source generates a seed light source which sequentially passes through the light beam isolation system (2), the light beam separation system (3) and the stimulated Brillouin scattering compression pool and is finally reflected back to the stimulated Brillouin scattering compression pool through the concave reflector (7). The Brillouin parameter of the liquid Brillouin medium in the stimulated Brillouin scattering compression pool (6) changes along with the temperature, and the temperature of the medium pool is controlled through a temperature control system, so that the output pulse width adjustable characteristic is realized.
The pump light source (1) is a single longitudinal mode high-energy laser, can generate a seed light source and is beneficial to subnanosecond output.
In the scheme, the light beam isolation system (2) consists of a Faraday isolator, a half-wave plate and a polaroid, and the isolation system only allows light beams to pass in the forward direction can prevent backward transmission light generated by various reasons in an optical path from generating adverse effects on a light source and an optical path system. The optical isolation system can be realized in other forms according to actual conditions.
The light beam separation system (3) is composed of a polaroid and a quarter-wave plate, after s-polarized light passes through the polaroid, the s-polarized light passes through the quarter-wave plate twice and then is changed into p-polarized light, and a light path is separated by the polaroid.
A half wave plate is arranged between the beam isolation system and the beam separation system.
The temperature control system comprises a temperature control module (4) and a TEC refrigerating sheet (5), the TEC refrigerating sheet (5) is installed on the upper surface of the stimulated Brillouin scattering compression pool, and the cold end and the hot end of the TEC refrigerating sheet (5) are connected with the temperature control module. Temperature control with 0.1 ℃ accuracy can be realized.
In the scheme, the stimulated Brillouin scattering compression pool (6) and the concave reflector (7) form a standing wave driven stimulated Brillouin scattering system, and the stimulated Brillouin scattering process is driven by coherent standing waves.
The medium in the stimulated Brillouin scattering compression pool (6) adopts liquid fluorocarbon.
According to the technical scheme, the invention has the following beneficial effects:
1. according to the subnanosecond laser compressor with the adjustable pulse width, the time domain pulse width is adjusted through the temperature, the high-precision adjustment of the finally output pulse width can be achieved through the accurate temperature control, and the temperature control precision can be 0.1 ℃. The compressor is set by depending on the characteristic that the Brillouin parameter of the Brillouin medium changes along with the temperature change, the adjustment precision is high, the structural parameter does not need to be changed, and the engineering adaptability is high.
2. The pulse width adjustable subnanosecond laser compressor provided by the invention has the advantages of high load and high energy conversion efficiency, can realize Joule-level high-energy subnanosecond laser operation, and has the energy conversion efficiency of more than 90%.
3. The subnanosecond laser compressor with the adjustable pulse width is based on stimulated Brillouin scattering (the stimulated Brillouin scattering is a phenomenon, and the phase conjugation characteristic of the stimulated Brillouin scattering is utilized to compensate static phase distortion caused in the optical path in the processing process of an optical component and dynamic phase distortion caused by heat when the laser is in repeated frequency operation so as to output good light beam quality), has the phase conjugation and pulse width compression characteristics, and can realize short pulse output with high light beam quality.
Drawings
FIG. 1 is a high energy sub-nanosecond liquid laser compressor with continuously tunable output pulse width provided by the present invention;
fig. 2(a) is a pulse width waveform diagram of a pump light source according to an embodiment.
FIGS. 2(b) and 2(f) are graphs showing the waveforms of the output pulse width of the compressor with temperature changes when the temperature is adjusted to 10 deg.C, 20 deg.C, 30 deg.C, 40 deg.C, and 50 deg.C, respectively.
In the figure, 1 is a pumping light source, 2 is a beam isolation system, 3 is a beam separation system, 4 is a temperature control module, 5 is a TEC refrigeration plate, 6 is a stimulated brillouin scattering compression pool, and 7 is a concave reflector.
Detailed Description
In order to make the objects, technical solutions, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, the large-energy subnanosecond liquid laser compressor with continuously tunable output pulse width provided by the invention in fig. 1 comprises a pumping light source (1), a beam isolation system (2), a beam splitting system (3), a temperature control module (4), a TEC refrigeration plate (5), a Stimulated Brillouin Scattering (SBS) compression pool (6) and a concave mirror (7) which are sequentially arranged. The Brillouin parameter of the liquid Brillouin medium in the stimulated Brillouin scattering compression pool (6) changes along with the temperature, and the output pulse width adjustable characteristic is realized by controlling the temperature of the medium pool through a temperature control system.
The pumping light source (1) is a single longitudinal mode solid pulse laser, and the beam isolation system (2) is a system consisting of a Faraday magneto-optical isolator, a half wave plate and a polaroid. The beam splitting system (3) is composed of a polaroid and a quarter-wave plate, and can realize the separation of the return light from the optical path; the SBS compression pool is made of glass or metal with high heat conduction coefficient, and high-load fluorocarbon is attached to the SBS compression pool and serves as a Brillouin medium.
The phonon lifetime influencing the output of the Brillouin medium is inversely proportional to the viscosity coefficient, so that the medium with the viscosity coefficient sensitive to temperature and wide variation range is selected. The temperature is continuously changed through a temperature control system, so that the phonon life of the medium is continuously changed, and finally, the continuous tunability of the output pulse width is realized under the condition of not changing the structure.
The temperature control system adopts a TEC refrigeration system with high adjustment precision and large range, and the available models are as follows: tec-12706/12705/12703/12707/12710/12708.
FIGS. 2(b) and 2(f) are graphs showing the waveforms of the output pulse width of the compressor with temperature changes when the temperature is adjusted to 10 deg.C, 20 deg.C, 30 deg.C, 40 deg.C, and 50 deg.C, respectively. The compressor can change the temperature within the range of-20 to 150 ℃, can obtain the pulse width within the range of 100ps to 2ns, and can continuously obtain different pulse widths by continuously changing the temperature. The vertical axis of the graph is the pulse intensity and the horizontal axis is the pulse duration. @ @ indicates at what temperature the pulsewidth output is, e.g., 200ps @10 ℃ indicates at 10 ℃ the pulsewidth output is 200 ps; 20 deg.C @320ps indicates that the pulse width output is 320ps at a temperature of 20 deg.C.
When the product is actually made, an energy adjusting system consisting of a half-wave plate and a beam separation system 3 is added behind the beam isolation system 2, the size of input energy is adjusted, the output energy is controlled, and meanwhile, the adjusting range of the output pulse width can be expanded. In fig. 1, vertical are wave plates (including half and quarter wave plates), and tilted are polarizers.
In addition, different pulse width adjusting ranges can be formed by selecting compressor structure parameters and Brillouin media such as lens focal length, pool length, Brillouin media types and the like according to different pulse width adjusting ranges required in application.
The invention relates to a standing wave driving structure, which is more stable by focusing a concave reflector (7) in a stimulated Brillouin scattering compression pool (6) to generate standing waves to drive SBS compared with the traditional method that a beam expanding system is adopted to act on a convex lens to generate noisy stokes light to drive SBS.
The invention can provide different temperature control through the digital keying of the temperature control module, thereby realizing the continuous adjustment of the pulse width in the true sense, and overcoming the defects that the traditional laser needs to adjust one optical structure for one pulse width when obtaining different pulse widths, and is extremely complicated and inconvenient.
The invention is a liquid laser, which can obtain high-power laser and realize continuous pulse width regulation by temperature control.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Nothing in this specification is said to apply to the prior art.
Claims (8)
1. The liquid laser compressor comprises a pumping light source and is characterized by further comprising a temperature control system and a stimulated Brillouin scattering compression pool, and the temperature of a medium in the stimulated Brillouin scattering compression pool is controlled through the temperature control system.
2. The compressor according to claim 1, wherein the phonon lifetime of the liquid medium in the stimulated brillouin scattering compression pool is inversely proportional to the viscosity coefficient, and the temperature is continuously changed through the temperature control system, so that the phonon lifetime of the medium is continuously changed, and continuous pulse width adjustment is realized.
3. The compressor as claimed in claim 1, wherein the temperature control system comprises a temperature control module (4) and a TEC refrigeration plate (5), the TEC refrigeration plate (5) is installed on the upper surface of the stimulated Brillouin scattering compression pool, and the cold end and the hot end of the TEC refrigeration plate (5) are connected with the temperature control module.
4. The compressor according to claim 1, characterized in that the compressor further comprises a beam isolation system (2) and a beam separation system (3) which are sequentially arranged, wherein the pumping light source generates a seed light source which sequentially passes through the beam isolation system (2), the beam separation system (3) and the stimulated Brillouin scattering compression pool and is finally reflected back to the stimulated Brillouin scattering compression pool through the concave reflector (7); the Brillouin parameter of the liquid Brillouin medium in the stimulated Brillouin scattering compression pool (6) changes along with the temperature, and the temperature of the medium pool is controlled through a temperature control system, so that the output pulse width adjustable characteristic is realized.
5. The compressor according to claim 4, characterized in that the pump light source (1) is a high-energy single longitudinal mode laser; the beam isolation system (2) consists of a Faraday isolator, a half wave plate and a polaroid and only allows the forward passing of the light beam;
the light beam separation system (3) consists of a polaroid and a quarter-wave plate, after s-polarized light passes through the polaroid, the s-polarized light passes through the quarter-wave plate twice and then is changed into p-polarized light, and a light path is separated by the polaroid;
a half wave plate is arranged between the beam isolation system and the beam separation system.
6. The compressor of claim 4, wherein the temperature control system is capable of achieving temperature control with a precision of 0.1 ℃.
7. The high-energy pulse width tunable liquid compressor according to claim 4, wherein the stimulated Brillouin scattering compression pool (6) and the concave reflector (7) form a standing wave driven stimulated Brillouin scattering system, and the stimulated Brillouin scattering process is driven by coherent standing waves.
8. The high-energy pulse width tunable liquid compressor according to claim 1, wherein the medium in the stimulated brillouin scattering compression cell (6) is liquid fluorocarbon.
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| CN202110341083.0A CN112928592A (en) | 2021-03-30 | 2021-03-30 | Liquid laser compressor with continuously tunable output pulse width |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1216874A (en) * | 1997-11-04 | 1999-05-19 | 哈尔滨工业大学 | Stimulated Brillouin scattering phase conjugate parameter oscillator |
| US20140269786A1 (en) * | 2013-03-15 | 2014-09-18 | Spectral Energies, Llc | Continuously variable pulse-width, high-speed laser |
| CN104810721A (en) * | 2015-03-02 | 2015-07-29 | 吕志伟 | High-energy hundreds of picoseconds laser device based on stimulated Brillouin scattering pulse compression |
| CN108593106A (en) * | 2018-04-19 | 2018-09-28 | 南昌航空大学 | A kind of system and device of detection stimulated Brillouin scattering transient state ultrasonic grating spectrum |
| CN110233418A (en) * | 2019-07-29 | 2019-09-13 | 长春理工大学 | A kind of turnable pulse width short-pulse laser |
| CN111564750A (en) * | 2020-05-18 | 2020-08-21 | 中国人民解放军国防科技大学 | System and method for inhibiting stimulated Brillouin scattering effect in high-power narrow-linewidth optical fiber laser amplifier |
| CN212626499U (en) * | 2020-08-03 | 2021-02-26 | 河北工业大学 | Self-pumping SBS pulse compression system of twin-pool |
| CN214411751U (en) * | 2021-03-30 | 2021-10-15 | 河北工业大学 | Liquid laser compressor with continuously tunable output pulse width |
-
2021
- 2021-03-30 CN CN202110341083.0A patent/CN112928592A/en active Pending
Patent Citations (8)
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|---|---|---|---|---|
| CN1216874A (en) * | 1997-11-04 | 1999-05-19 | 哈尔滨工业大学 | Stimulated Brillouin scattering phase conjugate parameter oscillator |
| US20140269786A1 (en) * | 2013-03-15 | 2014-09-18 | Spectral Energies, Llc | Continuously variable pulse-width, high-speed laser |
| CN104810721A (en) * | 2015-03-02 | 2015-07-29 | 吕志伟 | High-energy hundreds of picoseconds laser device based on stimulated Brillouin scattering pulse compression |
| CN108593106A (en) * | 2018-04-19 | 2018-09-28 | 南昌航空大学 | A kind of system and device of detection stimulated Brillouin scattering transient state ultrasonic grating spectrum |
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