CN105024274A - Raman laser device for optimizing pumping laser by means of two-stage stimulated Brillouin scattering method - Google Patents
Raman laser device for optimizing pumping laser by means of two-stage stimulated Brillouin scattering method Download PDFInfo
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- CN105024274A CN105024274A CN201410168890.7A CN201410168890A CN105024274A CN 105024274 A CN105024274 A CN 105024274A CN 201410168890 A CN201410168890 A CN 201410168890A CN 105024274 A CN105024274 A CN 105024274A
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Abstract
The invention provides a Raman laser device for optimizing pumping laser by means of a two-stage stimulated Brillouin scattering method. The stimulated Raman has an extremely high requirement for pulse peak power, which is out of capacity of a common long-pulse laser device and diversification of wavelength is difficult to realize by utilizing SRS wavelength conversion so that a device of combination of compressed pulse and stimulated Raman is designed. According to the device, stimulated Brillouin scattering is performed on pumping laser firstly so as to compress pulse width of pulse laser, during which two times of pulse width compression is performed on laser so that great rising of pulse laser peak power is realized. Then the compressed pulse laser is utilized to act as pumping laser to realize stimulated Raman scattering wavelength conversion. The raman laser device for optimizing pumping laser by means of the two-stage stimulated Brillouin scattering method is a novel Raman laser device that the Brillouin pulse width compression method is firstly applied to stimulated Raman wavelength conversion.
Description
Technical field
A kind of Raman laser utilizing twin-stage stimulated Brillouin scattering method to optimize pumping laser, it designs to solve some low pulse power lasers due to power threshold value (reaching GW rank) this problem lower than excited Raman, the excited Brillouin gain coefficient of some medium is very high (8GW/cm), therefore Brillouin scattering (SRS) can be utilized the pulsewidth of pulse laser low for peak power to be narrowed by rational invention design, thus improve the pulse peak power of laser, and finally realize excited Raman conversion.
Background technology
Stimulated Raman scattering (SRS) is a kind of optical maser wavelength conversion means efficiently.The medium realizing excited Raman wavelength convert is diversified, although the gain of solid Roman medium is very high, its damage threshold is relatively low, and particularly fire damage threshold value is very low.The solid excited Raman of superlaser often can cause the thermal breakage of solid.Can realize the output of multi-wavelength in a liquid, this reduces the efficiency of single wavelength conversion, under laser irradiates, the photodissociation of medium consumes a large amount of pump energies.More single at some gas Raman energy level, Wavelength-converting is also more single, so just its conversion efficiency can be improved, gas have good flow performance make wavelength convert after remaining molecular energy dissipated fast by molecular collision, thereby promoting the conversion of excited Raman, so gas medium is the optimal selection of superlaser excited Raman.But the Raman gain coefficienct of gas is smaller, and (in gas medium, the gain coefficient of hydrogen is maximum, when with 1064nm laser for pump light time, the gain coefficient of 40 atmospheric hydrogen is approximately 1GW/cm), the threshold value realizing gas stimulated Raman scattering reaches GW rank, so just harsh requirement is proposed to stimulated Raman scattering pumping laser peak power, want the laser wavelength Raman conversion realizing earth pulse power, will first improve its laser peak power, stimulated Brillouin scattering (SRS) has the feature of threshold value low gain, so just the pulsewidth of pulse laser low for peak power can be narrowed by rational apparatus design, the peak power improving pump light realizes excited Raman wavelength convert.
Summary of the invention
Practicality of the present invention by the pulse compression of pumping laser, can improve its pulse peak power and then realize gas stimulated Raman scattering wavelength convert.The pulse 1064nm laser of such as 1MW also cannot realize the one way pond excited Raman conversion of gas medium, but for a lot of fluorocarbon liquid medium, such pulse laser can realize quite high excited Brillouin conversion ratio.
The compression of twin-stage Brillouin cell paired pulses is have employed in the present invention, first paired pulses laser carries out backward stimulated Brillouin scattering as seed light, and then seed light amplification is carried out in another one Brillouin cell, this kind of design has obvious Pulse Compression to pumping laser and improves its peak pulse power.The maximum feature of this invention changes pumping laser pulse quality to realize stimulated Raman scattering wavelength convert, is the novel Raman laser of one Brillouin's compression pulse width method be applied to first in gas excited Raman wavelength convert.
Technical solution of the present invention is as follows:
A kind of Raman laser utilizing twin-stage stimulated Brillouin scattering method to optimize pumping laser;
Comprise a pump laser, the first polarization splitting prism, the second polarization splitting prism, the 3rd polarization splitting prism, first Brillouin cell, second Brillouin cell, Raman pond;
First the laser that pump laser sends irradiates through λ/2 wave plate and be divided into reverberation and transmitted light on the first polarization splitting prism;
The reverberation of the first polarization splitting prism irradiates on the second polarization splitting prism, reverberation after the second polarization splitting prism injects first Brillouin cell through λ/4 wave plate from the right side window of first Brillouin cell, the backward Brillouin scattering light in first Brillouin cell from the right side window of first Brillouin cell through λ/4 wave plate, the second polarization splitting prism transmission, inject second Brillouin cell as seed light through the 2nd λ/4 wave plate from the left window of second Brillouin cell again; The left window of second Brillouin cell is coaxial with right side window;
Transmitted light after the first polarization splitting prism irradiates in the 3rd polarization splitting prism through the 2nd λ/2 wave plate again after plane mirror reflection, and the reverberation through the 3rd polarization splitting prism injects second Brillouin cell as pump light from the right side window of second Brillouin cell after the 3rd λ/4 wave plate;
In second Brillouin cell, seed light is penetrated by right side window after the amplification of pump light, and the light window that enters that injection light is transmitted through Raman pond through the 3rd λ/4 wave plate, the 3rd polarization splitting prism injects Raman pond, then by the light-emitting window outgoing of Raman pond;
Light path between the right side window of λ/4 wave plate and first Brillouin cell is provided with the first convex lens;
Light path in the left window emergent light of first Brillouin cell is provided with beam cut-off device;
Light path between the left window of the 2nd λ/4 wave plate and second Brillouin cell is provided with the second convex lens;
Light path between the right side window of the 3rd λ/4 wave plate and second Brillouin cell is provided with the 3rd convex lens;
The light path entered between light window in the 3rd polarization splitting prism and Raman pond is provided with the 4th convex lens.
Above design is that the good backward Brillouin light of beam quality that produced by first Brillouin cell by the cooperation of three polarization splitting prism systems is as seed light, with the second bundle pump light simultaneously and subtend (seed light and pump light light beam in second Brillouin cell merges but the transmission direction of two-beam is contrary) imports second Brillouin cell carries out seed light and carry out secondary Pulse Compression and amplification, the seed light of then amplifying imports the method realizing the stimulated Raman scattering scattering wavelength conversion of laser in Raman pond.
What in the present invention, the first Brillouin cell adopted is backward excited Brillouin light output;
In the present invention, then the first Brillouin cell generation seed light carries out second-compressed and amplification in the second Brillouin cell
What the second Brillouin cell adopted is the mode of seed light and pump light correlation.
Design in this invention first, two Brillouin cells will determine its Brillouin's medium loaded according to laser wavelength, the class I liquid I that the while of selecting the pump light sent laser to consume low, the gain of excited Brillouin is taller.
The Raman pond designed in this invention will determine its Raman medium loaded according to laser wavelength, the taller class gas of gain of excited Raman while of selecting the pump light sent laser to consume low.
First convex lens are the centers focusing the light into the first Brillouin cell; 4th convex lens are to Raman pond center by Laser Focusing; Second convex lens and the 3rd convex lens are that coaxial confocal is placed.
Obvious advantage:
(1) the present invention is by excited Brillouin and excited Raman combine with technique, and wherein excited Brillouin has the ability narrowing pulsewidth, makes lower powered laser also can realize excited Raman wavelength convert;
(2) what in the present invention, first Brillouin cell adopted is backward excited Brillouin light output, and the beam quality of backward Brillouin scattering is relatively good, so just has the ability improving beam quality;
(3) in the present invention, then first Brillouin cell generation seed light amplify in second Brillouin cell, and the coupling of two Brillouin cells makes compression pulse width ability stronger;
(4) in the present invention, namely second Brillouin cell have Pulse Compression effect by the subtend propagation of laser to seed light, has amplification again.
Accompanying drawing explanation
The equipment that Fig. 1 designs for the present invention, optics and index path thereof;
In figure: 1 is pulse laser; 2 is λ/2 wave plate; 3 is the first polarization splitting prism; 4 is the second polarization spectro sheet prism; 5 is λ/4 wave plate; 6 is the first convex lens; 7 is the first Brillouin cell; 8 is beam cut-off device; 9 is the 2nd λ/4 wave plate; 10 is the second convex lens; 11 is the second Brillouin cell; 12 is the 3rd convex lens; 13 is the 3rd λ/4 wave plate; 14 is the 3rd polarization splitting prism; 15 is the 4th convex lens; 16 is Raman pond; 17 is plane mirror; 18 is the 2nd λ/2 wave plate.
Embodiment
Because excited Raman is very high for the requirement of pulse peak power, well beyond the ability of common long-pulse laser, be difficult to utilize SRS wavelength convert to realize the variation of wavelength, therefore the present invention designs the device of a kind of compression pulse and excited Raman combination.This device first does stimulated Brillouin scattering to pumping laser and the pulsewidth of pulse laser is compressed, twice Pulse Compression is done to laser therebetween, to realize the significantly lifting of pulse laser peak power, and then the pulse laser after compression is utilized to realize stimulated Raman scattering wavelength convert as pump light.This invention is the novel Raman laser of one Brillouin's compression pulse width method be applied to first in excited Raman wavelength convert.
The embodiment of the Raman laser of the low pulse power laser pumping of the present invention is described as follows (as Fig. 1):
Pulse laser 1 sends pulse laser, after the tune of λ/2 wave plate 2 pairs of polarization directions is irradiated to the first polarization splitting prism 3 energy distribution, laser is divided into two bundles, in laser through be P polarised light, what reflect is S polarised light, upwards reflected through λ/4 wave plate 5 through the second polarization spectro sheet 4 by the S polarised light that reflects to become circularly polarized light and focused in the first Brillouin cell 7 by the first convex lens 6 again, component permeate enters into beam cut-off device 8, some returns again through the first convex lens 6 to the former road of Brillouin light after creating in the first Brillouin cell 7, P polarised light is become after λ/4 wave plate 5, so just can focus in the second Brillouin cell 11 through the 2nd λ/4 wave plate 5 and the second convex lens 10 again through the second polarization splitting prism 4.Directly through the laser of the P polarization of the first polarization spectro sheet 4, become S polarised light through plane mirror 17 the 2nd λ/2 wave plate 18, through the 3rd polarization splitting prism 14, focus in the second Brillouin cell 11 through the 2nd λ/4 wave plate 13 and the 3rd convex lens 12.The Brillouin's seed light be exaggerated, through the laser becoming a branch of P polarization after the 3rd convex lens the 12, three λ/4 wave plate 13, after the 3rd polarization spectro sheet 14, then focuses in Raman pond 16 through the 4th convex lens 15, produces excited Raman light.
Specifically:
In figure, pulse laser sends pulse laser, laser is divided into two bundles by the energy reasonable distribution through overregulating λ/2 wave plate and polarization spectro sheet, wherein a branch of inciding in the first Brillouin cell produces backward excited Brillouin seed light, light beam is as the pump light of the second Brillouin cell in addition, meet with excited Brillouin seed light in the second Brillouin cell, such seed light obtains the compression of pulse and the amplification of power.Re-use in the Laser Focusing after by compression pulse width to Raman pond the pump light done in wavelength convert, finally export Raman light.
The stimulated Brillouin scattering principle that this device adopts is compressed laser pulse, because stimulated Brillouin scattering has the advantage of low threshold value and high gain.
Can realize SBS medi um is perfluorocarbon compound series medium, the principle that these media are selected will be determined according to pumping laser wavelength, first can not have strong absorption to pumping laser, secondly excited Brillouin threshold value is low, and excited Brillouin gain is higher again.
This device adopt be gas stimulated Raman scattering (such as: hydrogen, oxygen, methane, nitrogen, carbon dioxide etc.) optical maser wavelength is converted, the feature being gas excited Raman to the selection requirement of gas is larger to wavelength conversion span, and strong to the dissipation capability of heat, conversion efficiency is high.
Claims (6)
1. utilize twin-stage stimulated Brillouin scattering method to optimize the Raman laser of pumping laser, it is characterized in that:
Comprise a pump laser (1), first polarization splitting prism (3), second polarization splitting prism (4), 3rd polarization splitting prism (14), first Brillouin cell (7), second Brillouin cell (11), Raman pond (16);
First the laser that pump laser (1) sends irradiates through λ/2 wave plate (2) and be divided into reverberation and transmitted light on the first polarization splitting prism (3);
The reverberation of the first polarization splitting prism (3) irradiates on the second polarization splitting prism (4), reverberation after the second polarization splitting prism (4) injects first Brillouin cell (7) through λ/4 wave plate (5) from the right side window of first Brillouin cell (7), backward Brillouin scattering light in first Brillouin cell (7) from the right side window of first Brillouin cell (7) through λ/4 wave plate (5), second polarization splitting prism (4) transmission, second Brillouin cell (11) is injected as seed light from the left window of second Brillouin cell (11) again through the 2nd λ/4 wave plate (9), the left window of second Brillouin cell (11) is coaxial with right side window,
Transmitted light after the first polarization splitting prism (3) irradiates in the 3rd polarization splitting prism (14) through the 2nd λ/2 wave plate (18) again after plane mirror (17) reflection, and the reverberation through the 3rd polarization splitting prism (14) injects second Brillouin cell (11) as pump light from the right side window of second Brillouin cell (11) after the 3rd λ/4 wave plate (13);
In second Brillouin cell (11), seed light is penetrated by right side window after the amplification of pump light, the light window that enters that injection light is transmitted through Raman pond (16) through the 3rd λ/4 wave plate (13), the 3rd polarization splitting prism (14) injects Raman pond (16), then by the light-emitting window outgoing of Raman pond (16).
2. Raman laser according to claim 1, is characterized in that:
Light path between the right side window of λ/4 wave plate (5) and first Brillouin cell (7) is provided with the first convex lens (6).
3. Raman laser according to claim 1, is characterized in that:
Light path in the left window emergent light of first Brillouin cell (7) is provided with beam cut-off device (8).
4. Raman laser according to claim 1 and 2, is characterized in that:
Light path between the left window of the 2nd λ/4 wave plate (9) and second Brillouin cell (11) is provided with the second convex lens (10).
5. the Raman laser according to claim 1,2 or 4, is characterized in that:
Light path between the right side window of the 3rd λ/4 wave plate (13) and second Brillouin cell (11) is provided with the 3rd convex lens (12).
6. Raman laser according to claim 5, is characterized in that:
The light path entered between light window in the 3rd polarization splitting prism (14) and Raman pond (16) is provided with the 4th convex lens (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410168890.7A CN105024274A (en) | 2014-04-24 | 2014-04-24 | Raman laser device for optimizing pumping laser by means of two-stage stimulated Brillouin scattering method |
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| CN201410168890.7A CN105024274A (en) | 2014-04-24 | 2014-04-24 | Raman laser device for optimizing pumping laser by means of two-stage stimulated Brillouin scattering method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101946A (en) * | 2017-06-28 | 2017-08-29 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| CN114389141A (en) * | 2022-01-13 | 2022-04-22 | 河北工业大学 | Ultrashort pulse laser based on stimulated Raman scattering generation amplification structure |
| CN114389138A (en) * | 2022-01-13 | 2022-04-22 | 河北工业大学 | Pulse width compressor based on stimulated Raman scattering secondary amplification structure |
| CN114552346A (en) * | 2020-11-27 | 2022-05-27 | 中国科学院大连化学物理研究所 | Narrow linewidth wavelength continuously tunable laser device and method for outputting 732nm laser |
Citations (2)
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| US20020024986A1 (en) * | 2000-07-14 | 2002-02-28 | Takashi Arisawa | Systems for generating short-pulse laser light |
| CN101887205A (en) * | 2010-03-30 | 2010-11-17 | 南昌航空大学 | Method for amplifying two-cell Brillouin scattering by controlling polarization state |
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2014
- 2014-04-24 CN CN201410168890.7A patent/CN105024274A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020024986A1 (en) * | 2000-07-14 | 2002-02-28 | Takashi Arisawa | Systems for generating short-pulse laser light |
| CN101887205A (en) * | 2010-03-30 | 2010-11-17 | 南昌航空大学 | Method for amplifying two-cell Brillouin scattering by controlling polarization state |
Non-Patent Citations (2)
| Title |
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| EVGENII G.PIVINSKII等: "Nd:YAG laser pulse compression by three-stage stimulated Brillouin and Raman scatterings", 《PROC. SPIE》 * |
| V.NASSISI等: "Stimulated Brillouin and Raman scattering for the generation of short excimer laser pulses", 《IEEE JOURNAL OF QUANTUM ELECTRONICS》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101946A (en) * | 2017-06-28 | 2017-08-29 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| CN107101946B (en) * | 2017-06-28 | 2019-11-15 | 哈尔滨工业大学 | The homologous laser pump (ing) detection device of light delay with probe optical pulse compress technique |
| CN114552346A (en) * | 2020-11-27 | 2022-05-27 | 中国科学院大连化学物理研究所 | Narrow linewidth wavelength continuously tunable laser device and method for outputting 732nm laser |
| CN114389141A (en) * | 2022-01-13 | 2022-04-22 | 河北工业大学 | Ultrashort pulse laser based on stimulated Raman scattering generation amplification structure |
| CN114389138A (en) * | 2022-01-13 | 2022-04-22 | 河北工业大学 | Pulse width compressor based on stimulated Raman scattering secondary amplification structure |
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