CN114204395A - Stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser - Google Patents

Stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser Download PDF

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Publication number
CN114204395A
CN114204395A CN202210034659.3A CN202210034659A CN114204395A CN 114204395 A CN114204395 A CN 114204395A CN 202210034659 A CN202210034659 A CN 202210034659A CN 114204395 A CN114204395 A CN 114204395A
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pulse width
srs
laser
compression
light
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Inventor
刘照虹
李绍文
罗甜甜
樊榕
纪文强
陈婷婷
王雨雷
吕志伟
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Hebei University of Technology
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Hebei University of Technology
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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
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08018—Mode suppression
    • H01S3/08022—Longitudinal modes
    • 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

Abstract

The invention relates to a stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser, which comprises: the laser comprises a pumping source, an optical isolation system, a half-wave plate, a first polaroid, an SBS pulse width compression system with adjustable pulse width, a first reflector and an SRS generation amplification system, wherein a single longitudinal mode laser is used as the pumping source to emit pumping light, and the pumping light sequentially passes through the optical isolation system, the half-wave plate and the first polaroid and then enters the SBS pulse width compression system; the pump light is compressed into hundred picosecond laser in the SBS pulse width compression system, and the compressed hundred picosecond laser enters the SRS generation amplification system for further compression and amplification after being reflected by the first polaroid and the first reflector. By the technical scheme of combining and compressing the SBS pulse width compression technology and the SRS pulse width compression technology, the limitation of the compression limit of the SBS pulse width compression technology is overcome, and the laser pulse width output with narrower pulse width than that of the Q-switching technology and higher energy than that of the mode locking technology is achieved.

Description

Stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser
Technical Field
The invention relates to the technical field of large-energy short pulse laser, in particular to a stimulated Brillouin scattering and stimulated Raman scattering combined compression ultrashort pulse laser.
Background
Ultrashort pulse laser has wide application in many fields such as impact dynamics, laser precision ranging, ultra-long range laser radar, laser medical instrument and laser micromachining, and especially large-energy ultrashort pulse laser has important significance in promoting industrial processing and leading edge science.
Currently, there are three main methods for obtaining short pulse lasers: (1) the Q-switching technology can obtain sub-nanosecond short pulse laser by shortening the cavity length, and can obtain sub-nanosecond high-energy laser by combining with traveling wave amplification [ for example, patent publication No.: CN110880672B, patent name: a high repetition frequency large energy nanosecond pulse laser and a method for using the same ], but the method can not obtain shorter pulses any more; (2) the mode locking technology can obtain the ultrashort ultrafast pulse from femtosecond to picosecond, but the generated pulse energy is smaller, usually in the magnitude of nano-focus to micro-focus, and the subsequent amplification is more complex [ for example, patent publication: CN101562310, patent name: passively mode-locked picosecond lasers ]; (3) the Stimulated Scattering pulse width compression technology generally compresses nanosecond pulses to the order of one hundred picoseconds through Stimulated Brillouin Scattering (SBS), and the method can obtain large-energy one hundred picoseconds laser, but is limited by physical limits and cannot obtain ultrashort ultrafast pulse laser. The invention combines the SBS and Stimulated Raman Scattering (SRS) compression technology, gives consideration to the high energy conversion efficiency of SBS and the short compression limit of SRS, can effectively generate the large energy ultrashort pulse laser, has simple structure, low cost and strong engineering applicability, and is a very effective technology for generating the large energy ultrashort pulse.
Disclosure of Invention
The invention provides an ultrashort pulse laser combining stimulated Brillouin scattering and stimulated Raman scattering, which overcomes the limitation of the compression limit of the SBS pulse width compression technology by the technical scheme of combining the SBS pulse width compression technology and the SRS pulse width compression technology, achieves the laser pulse width output with narrower pulse width than the Q-switching technology and higher energy than the mode-locking technology, and simultaneously realizes the continuous adjustment of the pulse width by introducing a temperature control system.
A stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser, comprising: the laser comprises a pumping source 1, an optical isolation system 2, a half wave plate 3, a first polaroid 4 and an SBS pulse width compression system 5 with adjustable pulse width, and is characterized in that the laser further comprises a first reflector 6 and an SRS generating and amplifying system 7,
the single longitudinal mode laser is used as a pumping source 1 to emit pumping light, and the pumping light sequentially passes through an optical isolation system 2, a half wave plate 3 and a first polaroid 4 and then enters an SBS pulse width compression system 5; the pump light is compressed into hundred picosecond laser in the SBS pulse width compression system 5, and the compressed hundred picosecond laser is reflected by the first polaroid 4 and the first reflector 6 and then enters the SRS generating and amplifying system 7 for further compression and amplification.
The SRS generation and amplification system 7 is used for realizing pulse width compression of hundred picosecond light generated by the SBS pulse width compression system 5, the SRS generation and amplification system 7 comprises a beam splitter 7-1, a second reflector 7-2, a third reflector 7-3, a narrow-band optical filter 7-4, an SRS generation pool 7-5, a first dichroic mirror 7-6, a first SRS amplification pool 7-7 and a second dichroic mirror 7-8, and the hundred picosecond laser generated by the SBS pulse width compression system 5 is split by the beam splitter 7-1 after entering the SRS generation and amplification system 7: one beam is reflected by the first dichroic mirror 7-6 and enters the SRS generating pool 7-5, forward stimulated Raman scattering occurs in the SRS generating pool 7-5, Stokes seed light which generates forward transmission penetrates through the narrow-band optical filter 7-4, is reflected by the third reflecting mirror 7-3 and then penetrates through the first dichroic mirror 7-6 and enters the first SRS amplifying pool 7-7; and the other beam is reflected by the second reflecting mirror 7-2 and the second dichroic mirror 7-8 to enter the first SRS amplification pool 7-7 and meet the Stokes seed light in an opposite direction, and because the two beams of light meet the SRS phase matching condition, the energy of the hundred picosecond laser is extracted from the Stokes seed light for amplification, and finally the energy is output through the second dichroic mirror 7-8.
The laser also comprises a fourth reflector 8, a fourth reflector 9, a second SRS amplification pool 10 and a third dichroic mirror 11, and the unconsumed hundred picosecond laser and the once amplified Stokes seed light are subjected to second amplification compression through deflection of a light path so as to obtain higher energy conversion efficiency; stokes seed light output by the second dichroic mirror 7-8 enters the second SRS amplification pool 10 through the fourth reflecting mirror 8 and the fourth reflecting mirror 9, hundred picosecond laser light from the second dichroic mirror 7-8 is highly reflected to the third dichroic mirror 11 through the first dichroic mirror 7-6, is highly reflected to the second SRS amplification pool 10 to meet with the Stokes seed light in an opposite direction again, is subjected to second amplification and compression, and finally high-energy picosecond laser light is output.
The narrow-band filter 7-4 filters the residual hundred picosecond laser and high-order Stokes components and only retains the forward first-order Stokes components; the first dichroic mirror 7-6 and the second dichroic mirror 7-8 are both highly transparent to forward first-order Stokes seed light and highly reflective to hundred picosecond laser light.
The optical isolation system 2 consists of a second polaroid 2-1, a Faraday optical rotator 2-2 and a third polaroid 2-3, the SBS pulse width compression system 5 consists of a quarter-wave plate 5-1, an SBS pulse width compression pool 5-2, a TEC refrigeration plate 5-3, a temperature control module 5-4 and a concave reflector 5-5, and the pumping source 1 generates single longitudinal mode pumping light which sequentially passes through the isolation system 2 to prevent the return light from damaging the resonant cavity; the pump light is changed into circularly polarized light through the half wave plate 3, the first polaroid 4 and the quarter wave plate 5-1, then SBS pulse width compression effect is generated in the SBS pulse width compression pool 5-2, the pump light is compressed to hundred picoseconds magnitude, the temperature in the SBS pulse width compression pool is controlled by adjusting the TEC refrigeration plate 5-3 and the temperature control module 5-4, and the output pulse width is adjustable; the output hundred picosecond laser is reversely transmitted, a light path is separated by the first polaroid 4, and the laser is folded back by the first reflector 6 to enter the SRS generating and amplifying system 7.
The medium of the SBS pulse width compression pool 5-2 adopts a liquid fluorocarbon series medium with a large range of phonon life and gain coefficient along with temperature change, and is one of FC-72, FC-77, FC-87, FC-84, FC-70, FC-770 and the like.
In a liquid medium, the phonon life of the medium is reduced along with the reduction of the temperature, the narrowing of an output pulse is realized by cooling the medium, and meanwhile, the change of the temperature of the medium is controlled to enable the medium to become an output light source with adjustable pulse, so that the output pulse width of an SRS generating and amplifying system is controlled to be adjustable, and the narrowing of the final output pulse is realized.
The TEC refrigeration plate 5-3 selects a device with high temperature regulation precision as much as possible so as to carry out more accurate pulse width regulation, the temperature regulation range is-30 to 130 ℃, the regulation temperature cannot be higher than the boiling point of a medium in the SBS pulse width compression pool 5-2, and in order to obtain ideal output pulse width, the output pulse width of the SBS pulse width compression system 5 with adjustable pulse width is below 2ns as much as possible.
The SRS generating pool 7-5 adopts a method based on forward SRS seed generation, and the position of the first SRS amplifying pool 7-7 needs to ensure that the processes of the opposite encounter and amplification of the hundred picosecond laser and the Stokes seed light are all in the Raman medium.
Compared with the prior art, the invention has the beneficial effects that:
1. the stimulated Brillouin scattering and stimulated Raman scattering combined compression ultrashort pulse laser provided by the invention overcomes the limit of pulse compression limit of SBS pulse width compression technology by combining stimulated Brillouin scattering and stimulated Raman scattering, breaks through hundred picoseconds and can obtain large-energy ultrashort pulse output. The pulse width and the time domain waveform of SBS output are adjusted through temperature control, parameter control and optimization are further carried out on final output, the pulse width is further changed into an ultrashort pulse through generating an amplified SRS structure, and ultrashort compression of SBS pulse width from subnanosecond to subpicosecond, picosecond and tens of picoseconds can be achieved.
2. According to the ultrashort pulse laser, the hundred picosecond laser with high peak power is obtained by pre-compressing the high-energy nanosecond pulse through the SBS, the use of a focusing structure in the subsequent SRS pulse width compression can be avoided, the influence of high-order Stokes light on the pulse width compression is solved, the energy conversion efficiency can be remarkably improved, and picosecond pulse output with the magnitude of hundreds of millijoules and dozens of millijoules is obtained.
3. The ultrashort pulse laser provided by the invention has high energy conversion rate and single longitudinal mode output due to stimulated Brillouin scattering, and finally output laser pulses are single longitudinal modes, so that the ultrashort pulse laser can be applied to the related field needing single longitudinal mode high-energy picosecond laser.
4. The ultrashort pulse laser provided by the invention can generate special wavelength which is difficult to generate by other lasers due to larger wavelength frequency shift of stimulated Raman scattering, and the output is single wavelength.
5. The output of the SBS pulse width compression system in the ultrashort pulse laser determines the final output to a certain extent, the phonon life of the stimulated Brillouin medium is reduced along with the reduction of the temperature, and the phonon life of the Brillouin medium is changed by introducing the temperature regulation system, so that the pulse width of the laser can be regulated.
6. The ultrashort pulse laser provided by the invention can generate high-energy laser pulse output only through the SBS pulse width compression system and the SRS generation amplification system without amplifying the laser pulse by an active amplifier.
7. The output of the SBS pulse width compression system is controlled to be a standard-like Gaussian waveform, so that the Gaussian waveform can be input into the SRS amplification generation system, considering that the output power of the SBS needs to be strictly controlled due to permanent damage and irreparability of a solid SRS medium, and the output range of the SBS needs to meet the range between a damage threshold and a Raman threshold.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a stimulated brillouin scattering and stimulated raman scattering combined compressed ultrashort pulse laser according to the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of a stimulated brillouin scattering and stimulated raman scattering combined compressed ultrashort pulse laser according to the present invention.
Fig. 3 is a numerical simulation diagram of the backward Stokes light compressed and amplified by the SBS pulse width compression system with adjustable pulse width in the first embodiment.
Fig. 4 is a numerical simulation diagram of the final laser pulse output after being compressed and amplified by the SRS generation and amplification system in the first embodiment.
Fig. 5 is a measurement diagram of the input pulse width (a), the output pulse width (b) of the SBS pulse width compression system, and the final output pulse width (c) of the SRS generation amplification system of the ultrashort pulse laser provided by the present invention when the pump source pulse width is 8 ns.
In the drawings, the components represented by the respective reference numerals are listed below:
1: a pump source; 2: an optical isolation system;
3: a half wave plate; 4: a first polarizing plate;
5: an SBS pulse width compression system; 6: a first reflector;
7: an SRS generation amplification system; 8: a fourth mirror;
9: a fourth mirror; 10: a second SRS amplification pool;
a third dichroic mirror;
2-1: a second polarizing plate; 2-2: a Faraday rotator;
2-3: a third polarizing plate;
5-1: a quarter wave plate; 5-2: an SBS pulse width compression pool;
5-3: a TEC refrigeration piece; 5-4: a temperature control module;
5-5: a concave reflector;
7-1: a beam splitter; 7-2: a second reflector;
7-3: a third reflector; 7-4: a narrow band filter;
7-5: an SRS generation pool; 7-6: a first dichroic mirror;
7-7: an SRS amplification pool; 7-8: a second dichroic mirror.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments and the accompanying drawings.
The invention realizes the compression from nanosecond to hundred picoseconds by the SBS pulse width compression technology, and then realizes the compression from hundred picosecond pulses to picosecond pulses by the SRS pulse width compression technology. SBS pulse width compression can enable SRS to avoid the use of mode-locked lasers, and application value of the SRS is improved; the SRS pulse width compression technology overcomes the defect of large compression limit of the SBS technology, and can enable the whole system to realize output of picosecond and even femtosecond pulses.
Referring to fig. 1, a stimulated brillouin scattering and stimulated raman scattering combined compressed ultrashort pulse laser includes: the device comprises a pumping source 1, an optical isolation system 2, a half wave plate 3, a first polaroid 4, an SBS pulse width compression system 5 with adjustable pulse width, a first reflector 6 and an SRS generation amplification system 7.
The single longitudinal mode laser is used as a pumping source 1 to emit pumping light, and the pumping light sequentially passes through an optical isolation system 2, a half wave plate 3 and a first polaroid 4 and then enters an SBS pulse width compression system 5; the pump light is compressed into a hundred picosecond laser in the SBS pulse width compression system 5. The compressed hundred picosecond laser light is reflected by the first polarizer 4 and the first reflector 6 and enters the SRS generation and amplification system 7 for further compression and amplification.
Wherein the optical isolation system 2 consists of a second polaroid 2-1, a Faraday rotator 2-2 and a third polaroid 2-3; the incident light can pass through the optical isolation system 2 in a single direction, and the returned light cannot pass through the polaroid 2-1 due to the change of the polarization direction, so that the effect of protecting the pump source 1 is achieved. The polarizer is at brewster angle.
Wherein, the input energy can be controlled without changing the spot size and the beam quality by adjusting the half wave plate 3.
Furthermore, the SBS pulse width compression system 5 is used for achieving pulse width compression of the pump light, and the SBS pulse width compression system 5 is composed of a quarter-wave plate 5-1, an SBS pulse width compression pool 5-2, a TEC refrigeration plate 5-3, a temperature control module 5-4 and a concave reflector 5-5. After entering the SBS pulse width compression system 5, the pump light is firstly changed into circularly polarized light through the quarter-wave plate 5-1, reflected and focused by the concave reflecting mirror 5-5 through the SBS pulse width compression pool 5-2 to form an interference standing wave field, backward SBS is generated, hundred picosecond laser light is generated, returns along a light path and is changed into linearly polarized light through the quarter-wave plate 5-1 to be output, and the hundred picosecond laser light enters the SRS generation amplification system 7 after being reflected by the first polarizing plate 4 and the first reflecting mirror 6 after passing through the quarter-wave plate 5-1 twice.
SBS is limited by long phonon life, in liquid medium, phonon life of medium is reduced along with temperature reduction, output pulse narrowing can be realized by cooling medium, and simultaneously, the variable-frequency liquid crystal display can become a pulse adjustable output light source by controlling medium temperature change.
The medium in the SBS pulse width compression pool 5-2 is selected from liquid heavy fluorocarbon series medium with large temperature variation range, such as one of FC-72, FC-77, FC-87, FC-84, FC-70 and FC-770, so that the output pulse width can be adjusted by adjusting the medium temperature in the pool through the TEC refrigeration piece 5-3 and the temperature control module 5-4. The phonon life of the medium is reduced along with the reduction of the temperature, so that the final output pulse can be narrowed by cooling the medium, the output pulse width of the SBS pulse width compression system can be adjusted by changing the temperature, and the output pulse width of the SRS generating and amplifying system can be controlled to be adjustable.
Further, the SRS generating and amplifying system 7 is used for realizing pulse width compression of the hundred picoseconds light generated by the SBS pulse width compression system 5, and the SRS generating and amplifying system 7 is composed of a beam splitter 7-1, a second reflector 7-2, a third reflector 7-3, a narrow-band optical filter 7-4, an SRS generating pool 7-5, a first dichroic mirror 7-6, a first SRS amplifying pool 7-7 and a second dichroic mirror 7-8. Hundreds of picosecond laser generated by the SBS pulse width compression system 5 enters the SRS generation amplification system 7 and is split by the beam splitter 7-1; one beam is reflected by the first dichroic mirror 7-6 and enters the SRS generating pool 7-5, forward SRS occurs in the SRS generating pool 7-5, Stokes seed light which generates forward transmission penetrates through the narrow-band optical filter 7-4, is reflected by the third reflecting mirror 7-3 and then penetrates through the first dichroic mirror 7-6 to enter the first SRS amplifying pool 7-7; and the other beam is reflected by the second reflecting mirror 7-2 and the second dichroic mirror 7-8 to enter the first SRS amplification pool 7-7 and meet the Stokes seed light in an opposite direction, and because the two beams of light meet the SRS phase matching condition, the energy of the hundred picosecond laser is extracted from the Stokes seed light for amplification, and finally the energy is output through the second dichroic mirror 7-8.
The SRS generating pool 7-5 adopts a method based on forward SRS seed generation, the forward SRS is mainly used in the structure, backward Raman light cannot be amplified in the amplifying pool and does not meet with pump light, the forward SRS conversion efficiency is high compared with backward SRS conversion efficiency, the structure has the advantages of no need of adopting a focusing structure, no requirement on input line width and the like, and high-energy picosecond laser output can be achieved through subsequent amplification and compression of the first SRS amplifying pool 7-7.
Wherein, the narrow-band filter 7-4 filters out the residual hundred picosecond laser and high-order Stokes components and only retains the forward first-order Stokes components.
The first dichroic mirror 7-6 and the second dichroic mirror 7-8 are highly reflective to hundred picosecond laser light generated by the SBS pulse width compression system 5 and highly transparent to first-order Stokes seed light generated by the SRS generation pool 7-5.
The position of the first SRS amplification pool 7-7 needs to ensure that the processes of the hundred picosecond laser and the Stokes seed light opposite direction meeting and amplifying are all in the Raman medium.
Further, referring to fig. 2, the SRS generation amplification system 7 adds a fourth mirror 8, a fourth mirror 9, a second SRS amplification cell 10 and a third dichroic mirror 11 on the basis of the above structure, and performs a second amplification and compression on the unspent hundred picosecond laser and the once amplified Stokes seed light through the deflection of the optical path, so as to obtain a higher energy conversion efficiency. Stokes seed light output by the second dichroic mirror 7-8 enters the second SRS amplification pool 10 through the fourth reflecting mirror 8 and the fourth reflecting mirror 9, hundred picosecond laser light from the second dichroic mirror 7-8 is highly reflected to the third dichroic mirror 11 through the first dichroic mirror 7-6, is highly reflected to the second SRS amplification pool 10 to meet with the Stokes seed light in an opposite direction again, is subjected to second amplification and compression, and finally high-energy picosecond laser light is output.
The hundred picosecond laser generated by the SBS pulse width compression technology is used as input light of the SRS pulse width compression technology, so that the combined use of the SBS and the SRS is realized, and finally, the purpose of realizing the output of ultrashort pulses by using the SRS pulse width compression technology is realized.
The medium in the SBS pulse width compression pool 5-2 is one of liquid heavy fluorocarbon series media FC-72, FC-77, FC-87, FC-84, FC-70, FC-770 and the like, the pool length of the SBS pulse width compression pool 5-2, the SRS generation pool 7-5 and the first SRS amplification pool 7-7 is 0.5 cm-50 cm according to the difference of the medium and the actual situation, the focal length of the concave reflector 5-5 is 10-50 cm, and the medium in the pools of the two SRS amplification pools and the SRS generation pool is Ba (NO) with the optical phonon life of picosecond magnitude3)2、H2、NH3、CS2And the like, and a raman active medium among qualified solids, gases, and liquids.
The first embodiment is as follows: in this embodiment, the SRS generation and amplification system has the same structure as the above-mentioned specific embodiment, and has the following parameters:
the single longitudinal mode laser is used as a pumping source 1, the output wavelength is 1064nm, the divergence angle is 0.35mrad, and the peak power is 4 MW; the medium in the SBS pulse width compression pool 5-2 is FC-770 (the phonon life is 600ps, the Brillouin gain coefficient at 1064nm is 3.5cm/GW), and the pool length is 100 cm; the focal length of the concave reflector 5-5 is 33cm, and the distance between the concave reflector 5-5 and the SBS pulse width compression pool 5-2 is 10 cm; the gain media of the SRS generating pool 7-5 and the first SRS amplifying pool 7-7 are Ba (NO)3)2The device comprises a crystal, an SRS generating pool 7-5 is 3cm long, and a first SRS amplifying pool 7-7 is 7.5cm long; other types of devices are not limited as long as the devices can complete the functions. The numerical simulations of the hundred picosecond laser generated by the SBS pulse width compression system 5 of this embodiment and the final output ultrashort pulse laser are shown in fig. 3 and 4, and the pulse width of the final output ultrashort pulse laser is 160 ps.
Example two: the present embodiment has the same structure as the embodiment, and fig. 5 is a pulse width measurement diagram when the output wavelength of the pump source 1 is 1064nm and the pulse width is 8ns, where (a) is the output pulse width measurement diagram of the pump source 1, (b) is the output pulse width measurement diagram of the SBS pulse width compression system 5 with adjustable pulse width, and (c) is the final output pulse width measurement diagram of the SRS generation amplification system 7, and the pulse widths are 8ns, 711ps, and 97ps, respectively.
Example three: the TEC refrigeration plate 5-3 selects a device with high temperature regulation precision as far as possible so as to carry out more accurate pulse width regulation, the temperature regulation range is-30-130 ℃, and the regulation temperature cannot be higher than the boiling point of a medium in the SBS pulse width compression pool 5-2. And in order to obtain a more ideal output pulse width, the output pulse width of the SBS pulse width compression system 5 with adjustable pulse width is as less than 2ns as possible.
In the embodiment of the present invention, except for the specific description of the model of each device, the model of other devices is not limited as long as the device can perform the above functions, and what is not described in the present invention is applicable to the prior art.

Claims (10)

1. A stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser, comprising: the laser comprises a pumping source, an optical isolation system, a half-wave plate, a first polaroid and an SBS pulse width compression system with adjustable pulse width, and is characterized by further comprising a first reflector and an SRS generation amplification system,
the single longitudinal mode laser is used as a pumping source to emit pumping light, and the pumping light sequentially passes through the optical isolation system, the half-wave plate and the first polaroid and then enters the SBS pulse width compression system; the pump light is compressed into hundred picosecond laser in the SBS pulse width compression system, and the compressed hundred picosecond laser enters the SRS generation amplification system for further compression and amplification after being reflected by the first polaroid and the first reflector.
2. The stimulated brillouin scattering and stimulated raman scattering combined compression ultrashort pulse laser of claim 1, wherein the SRS generation amplification system is used for realizing pulse width compression of hundred picoseconds of light generated by the SBS pulse width compression system, the SRS generation amplification system comprises a beam splitter, a second reflector, a third reflector, a narrow-band optical filter, an SRS generation pool, a first dichroic mirror, a first SRS amplification pool and a second dichroic mirror, and the hundred picoseconds of laser generated by the SBS pulse width compression system is split by the beam splitter after entering the SRS generation amplification system: one beam is reflected into an SRS generating pool through a first dichroic mirror, forward stimulated Raman scattering occurs in the SRS generating pool, Stokes seed light which generates forward transmission penetrates through a narrow-band filter, is reflected by a third reflecting mirror and then penetrates through a first dichroic mirror to enter a first SRS amplifying pool; and the other beam of light is reflected by the second reflecting mirror and the second dichroic mirror to enter the first SRS amplification pool and meet with the Stokes seed light in an opposite direction, and because the two beams of light meet the SRS phase matching condition, the Stokes seed light can extract the energy of the hundred picosecond laser to be amplified, and finally the energy is output through the second dichroic mirror.
3. The stimulated brillouin scattering and stimulated raman scattering combined compression ultrashort pulse laser according to claim 2, further comprising a fourth mirror, a second SRS amplification pool and a third dichroic mirror, wherein the unconsumed hundred picoseconds laser and the once amplified Stokes seed light are subjected to second amplification compression through deflection of the optical path to obtain higher energy conversion efficiency; stokes seed light output by the second dichroic mirror enters the second SRS amplification pool through the fourth reflecting mirror and the fourth reflecting mirror, hundred picosecond laser light from the second dichroic mirror is highly reflected to the third dichroic mirror through the first dichroic mirror, is highly reflected to the second SRS amplification pool to meet with Stokes seed light in an opposite direction again, is subjected to secondary amplification and compression, and finally high-energy picosecond laser light is output.
4. The stimulated Brillouin scattering and stimulated Raman scattering combined compression ultrashort pulse laser as claimed in claim 3, wherein the medium in the SRS generating cell and the two SRS amplification cells selects a Raman active medium with an optical phonon lifetime on the order of picoseconds, preferably the Raman active medium is Ba (NO)3)2、H2、NH3、CS2One kind of (1).
5. The stimulated brillouin scattering and stimulated raman scattering combined compression ultrashort pulse laser according to claim 2, wherein the narrowband filter filters out the remaining hundred picosecond laser light and the high-order Stokes components, and only the forward first-order Stokes component is retained; the first dichroic mirror and the second dichroic mirror are both highly transparent to forward first-order Stokes seed light and highly reflective to hundred picosecond laser light.
6. The stimulated brillouin scattering and stimulated raman scattering combined compression ultrashort pulse laser as claimed in claim 1, wherein the optical isolation system is composed of a second polarizer, a faraday rotator and a third polarizer, the SBS pulse width compression system is composed of a quarter wave plate, a SBS pulse width compression pool, a TEC refrigeration plate, a temperature control module and a concave mirror, and the pumping source generates single longitudinal mode pumping light which sequentially passes through the isolation system to prevent the return light from damaging the resonant cavity; the pump light is converted into circularly polarized light through the half wave plate, the first polarizing film and the quarter wave plate, then an SBS pulse width compression effect is generated in an SBS pulse width compression pool, the pump light is compressed to a hundred picoseconds magnitude, the temperature in the SBS pulse width compression pool is controlled by adjusting the TEC refrigeration plate and the temperature control module, and the output pulse width is adjustable; the output hundred picosecond laser is reversely transmitted, a light path is separated by the first polaroid, and the laser is folded back by the first reflector to enter the SRS generation amplification system.
7. The stimulated brillouin scattering and stimulated raman scattering combined compression ultrashort pulse laser as claimed in claim 5, wherein the medium in the cell of the SBS pulse width compression cell is one of FC-72, FC-77, FC-87, FC-84, FC-70 and FC-770, which is a liquid fluorocarbon series medium with a large range of phonon lifetime and gain coefficient variation with temperature.
8. The stimulated brillouin scattering and stimulated raman scattering combined compression ultrashort pulse laser as claimed in claim 5, wherein in the liquid medium, the phonon lifetime of the medium is reduced along with the reduction of the temperature, the narrowing of the output pulse is realized by cooling the medium, and meanwhile, the change of the temperature of the medium is controlled to become an output light source with adjustable pulse, so that the output pulse width of the SRS generation and amplification system is controlled to be adjustable, and the narrowing of the final output pulse is realized.
9. The stimulated Brillouin scattering and stimulated Raman scattering combined compression ultrashort pulse laser as claimed in claim 5, wherein the TEC refrigeration plate selects a device with high temperature regulation precision as much as possible for more precise pulse width regulation, the temperature regulation range is-30 to 130 ℃, the regulation temperature cannot be higher than the boiling point of a medium in an SBS pulse width compression pool, and in order to obtain a more ideal output pulse width, the output pulse width of the SBS pulse width compression system with the adjustable pulse width is as much as less than 2 ns.
10. The stimulated brillouin scattering and stimulated raman scattering combined compression ultrashort pulse laser as claimed in claim 2, wherein the SRS generation pool adopts a forward SRS seed generation based method, and the first SRS amplification pool is located to ensure that the hundred picosecond laser and the Stokes seed light pair meet each other and are amplified in the raman medium.
CN202210034659.3A 2022-01-13 2022-01-13 Stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser Pending CN114204395A (en)

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