CN1851550A - Laser pulse shaping device and method based on two-cell stimulated Brillouin scattering system - Google Patents
Laser pulse shaping device and method based on two-cell stimulated Brillouin scattering system Download PDFInfo
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- CN1851550A CN1851550A CN 200610010101 CN200610010101A CN1851550A CN 1851550 A CN1851550 A CN 1851550A CN 200610010101 CN200610010101 CN 200610010101 CN 200610010101 A CN200610010101 A CN 200610010101A CN 1851550 A CN1851550 A CN 1851550A
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Abstract
In said invention, one beam of outputted polarized light of said pulsing laser, after beam splitting, inputting to one end of second medium pool in turn through third 1/4 wave plate and shrunk beam system etc; another beam inputting to first medium pool to generate Stokes seed light through second polaroid and first all reflection lens, Stokes seed light going back to second polaroid input end along original way, then transmitting through second polaroid and inputting to another end of second medium pool; through adjusting transmissibility of adjustable attenuation piece to changing Stokes seed light energy, to obtain straight top, high pulse front edge, high pulse trailing edge etc different impulse waveform.
Description
Technical field
The present invention relates to laser pulse time shaping technique field, specifically relate to a kind of devices and methods therefor that adopts the separate double cell stimulated Brillouin scattering system to carry out shaping for laser pulse.
Background technology
The time shaping of laser pulse has important use to be worth in inertial confinement fusion and Laser Processing.U.S. Lao Lunsi livermore national laboratory, University of Rochester's laser power energy laboratory, the big plate university of Japan laser engineering are studied in one's power, and Chinese Shanghai ray machine institute and high power laser light physics National Laboratory etc. have carried out big quantity research aspect the shaping of laser pulse time.Present shaping scheme mainly concentrates on Pockers cell slicing, integrated optical waveguide modulator, optical fiber and piles up aspects such as device, space-time transformation system.These methods exist the cost height, adopt the precise electronic device many, bear the low drawback of power density.Publication number is that the Chinese patent of CN1740889 " utilizes the secondary stimulated Brillouin scattering light limiting amplitude to obtain the method for flat top beam " though utilized the secondary stimulated Brillouin scattering to carry out light amplitude limit acquisition flat top beam, but it can't utilize same device to obtain multiple optical pulse waveform, and its device is not easy to adjust when the incident light energy changes.
Summary of the invention
For solve existing shaping pulse method and installation cost height thereof, adopt the precise electronic device many, bear the low problem that reaches very flexible of power density, the invention provides a kind of laser pulse shaping device and method based on two-cell stimulated Brillouin scattering system.
Apparatus for shaping of the present invention is by pulsed laser, 1/2 wave plate, first polaroid, second polaroid, first total reflective mirror, first quarter wave plate, first convex lens, the first medium pond, second total reflective mirror, transmissibility of adjustable attenuation piece, the 3rd polaroid, second quarter wave plate, the 3rd quarter wave plate, beam system contracts, the 3rd total reflective mirror, the 4th total reflective mirror and the second medium pond are formed, the polarized light of pulsed laser output is successively through being divided into two-beam behind 1/2 wave plate and first polaroid, a branch of light is successively through the 3rd quarter wave plate, beam system contracts, the 3rd total reflective mirror, incide an end in the second medium pond behind the 4th total reflective mirror, another Shu Guang is successively through second polaroid, first total reflective mirror, first quarter wave plate, incide behind first convex lens and produce the Stokes seed light in the first medium pond, described Stokes seed light turns back to the light input end of second polaroid along former road, described Stokes seed light after the second polaroid transmission successively through second total reflective mirror, transmissibility of adjustable attenuation piece, the 3rd polaroid, incide the other end in the second medium pond behind second quarter wave plate.
Shaping methods of the present invention carries out according to the following steps:
One, the polarized light of pulsed laser output rotates the angular setting splitting ratio of 1/2 wave plate by 1/2 wave plate and the first polaroid beam splitting;
Two, through a branch of transmission-polarizing light of obtaining from the light output end of first polaroid after the above-mentioned first step successively through inciding the light input end of the 3rd total reflective mirror behind the 3rd quarter wave plate, the beam system that contracts, this polarized light is changed an end that incides the second medium pond after the light path by the 3rd total reflective mirror and the 4th total reflective mirror;
Three, be input to the light input end of second polaroid through another bundle reflect polarized light that obtains from the light input end of first polaroid after the above-mentioned first step, this polarized light incides the light input end of first total reflective mirror after the reflection of second polaroid, this polarized light changes the light input end that impinges perpendicularly on first quarter wave plate after the light path by first total reflective mirror, and the light beam that obtains from the light output end of first quarter wave plate incides the first medium pond after first convex lens focus and produces the Stokes seed light;
Four, the Stokes seed light that above-mentioned the 3rd step produces is successively through first convex lens, first quarter wave plate, be input to the light input end of second polaroid behind first total reflective mirror, this Stokes seed light is through the light input end that incides second total reflective mirror behind second polaroid, this Stokes seed light incides the light input end of the 3rd polaroid again through transmissibility of adjustable attenuation piece after second total reflective mirror changes light path, the transmitted light that obtains at the light output end of the 3rd polaroid incides the other end in the second medium pond by second quarter wave plate, the transmitance of adjusting described transmissibility of adjustable attenuation piece changes the energy of described Stokes seed light, and the optical axis of the two-beam of incident overlaps respectively from the two ends in the second medium pond;
Five, the light beam that incides two ends, the second medium pond interacts in the second medium pond, be transmitted to the other end in medium pond from an end in medium pond by one road light of the 4th total reflective mirror reflection, in this process this road light through with the other end output of back that interacts of Stokes seed light from the other end incident in the second medium pond from the second medium pond, the above-mentioned light of exporting from the other end in the second medium pond is reflected by the 3rd polaroid after second quarter wave plate changes polarization state, and the described light that is reflected by the 3rd polaroid is the light with required pulse waveform.Above-mentioned all polaroids are placed by Brewster angle.
Device of the present invention has the following advantages: (1) structure is simpler; (2) all adopt optical element; (3) it can be applied under the condition of work of high power, macro-energy.Method of the present invention is used and is adjusted simply, and adopts method of the present invention can obtain the high different pulse waveform of flat-top, pulse front edge height or pulse back edge.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of pulse shaping device of the present invention; Fig. 2 is the input pulse waveform of oscillograph record; Fig. 3 is the square-topped pulse waveform that utilizes the present invention to obtain; Fig. 4 is the high waveform of pulse back edge that utilizes the present invention to obtain; Fig. 5 is the high waveform of pulse front edge that utilizes the present invention to obtain.
Embodiment
Embodiment one: referring to shown in Figure 1, the apparatus for shaping of this embodiment is by pulsed laser 1,1/2 wave plate 2, first polaroid 3, second polaroid 4, first total reflective mirror 5, first quarter wave plate 6, first convex lens 7, the first medium pond 8, second total reflective mirror 9, transmissibility of adjustable attenuation piece 10, the 3rd polaroid 11, second quarter wave plate 12, the 3rd quarter wave plate 13, beam system 14 contracts, the 3rd total reflective mirror 15, the 4th total reflective mirror 16 and the second medium pond 17 are formed, the polarized light of pulsed laser 1 output is successively through being divided into two-beam behind 1/2 wave plate 2 and first polaroid 3, a branch of light is successively through the 3rd quarter wave plate 13, beam system 14 contracts, the 3rd total reflective mirror 15, incide an end 17-1 in the second medium pond 17 behind the 4th total reflective mirror 16, another Shu Guang is successively through second polaroid 4, first total reflective mirror 5, first quarter wave plate 6, incide behind first convex lens 7 and produce the Stokes seed light in the first medium pond 8, described Stokes seed light turns back to the light input end of second polaroid 4 along former road, described Stokes seed light after 4 transmissions of second polaroid successively through second total reflective mirror 9, transmissibility of adjustable attenuation piece 10, the 3rd polaroid 11, incide the other end 17-2 in the second medium pond 17 behind second quarter wave plate 12.
The shaping methods of this embodiment carries out according to the following steps:
One, the polarized light of pulsed laser 1 output rotates the angular setting splitting ratio of 1/2 wave plate 2 by 1/2 wave plate 2 and 3 beam splitting of first polaroid; Two, through a branch of transmission-polarizing light of obtaining from the light output end of first polaroid 3 after the above-mentioned first step successively through inciding the light input end of the 3rd total reflective mirror 15 behind the 3rd quarter wave plate 13, the beam system 14 that contracts, this polarized light is changed an end 17-1 who incides the second medium pond 17 after the light paths by the 3rd total reflective mirror 15 and the 4th total reflective mirror 16; Three, be input to the light input end of second polaroid 4 through another bundle reflect polarized light that obtains from the light input end of first polaroid 3 after the above-mentioned first step, this polarized light incides the light input end of first total reflective mirror 5 after 4 reflections of second polaroid, this polarized light changes the light input end that impinges perpendicularly on first quarter wave plate 6 after the light paths by first total reflective mirror 5, and the light beam that obtains from the light output end of first quarter wave plate 6 incides the first medium pond 8 after first convex lens 7 focus on and produces the Stokes seed light; Four, the Stokes seed light that above-mentioned the 3rd step produces is successively through first convex lens 7, first quarter wave plate 6, be input to the light input end of second polaroid 4 behind first total reflective mirror 5, this Stokes seed light is through the light input end that incides second total reflective mirror 9 behind second polaroid 4, this Stokes seed light incides the light input end of the 3rd polaroid 11 again through transmissibility of adjustable attenuation piece 10 after second total reflective mirror 9 changes light path, the transmitted light that obtains at the light output end of the 3rd polaroid 11 incides the other end 17-2 in the second medium pond 17 by second quarter wave plate 12, the transmitance of adjusting described transmissibility of adjustable attenuation piece 10 changes the energy of described Stokes seed light, and making from the two ends in the second medium pond 17 respectively by the angle of regulating the 3rd total reflective mirror 15 and the 4th total reflective mirror 16, the optical axis of the two-beam of incident overlaps; Five, the light beam that incides 17 two ends, the second medium pond interacts in the second medium pond 17, be transmitted to the other end 17-2 in medium pond 17 from an end 17-1 in medium pond 17 by one road light of the 4th total reflective mirror 16 reflections, in this process this road light through with the other end 17-2 output of back that interacts of Stokes seed light from the other end 17-2 incident in the second medium pond 17 from the second medium pond 17, the above-mentioned light of exporting from the other end 17-2 in the second medium pond 17 is reflected by the 3rd polaroid 11 after second quarter wave plate 12 changes polarization states, and the described light that is reflected by the 3rd polaroid 11 is the light with required pulse waveform.Above-mentioned all polaroids are placed by Brewster angle.
In this embodiment, the optical path difference that the two-beam that is divided into by 1/2 wave plate 2 and first polaroid 3 arrives the second medium pond 17 respectively is 0～120cm, and the light path of light of an end 17-1 that the light ratio that arrives the other end 17-2 in the second medium pond 17 arrives the second medium pond 17 is little, in order to guarantee that two-way light can have interaction to a certain degree in the second medium pond 17, it is 1: 1～5: 1 that the angle of rotating 1/2 wave plate 2 in the step 1 makes the two-way light splitting ratio through 3 transmissions of first polaroid and reflection, because the optical path difference of the two-beam that 1/2 wave plate 2 and first polaroid 3 are divided into is not simultaneously, need the splitting ratio of adjustment also inequality, for example when above-mentioned optical path difference is approximately 0cm, splitting ratio can be 1: 1～2: 1, when above-mentioned optical path difference was approximately 120cm, splitting ratio can be 4: 1～5: 1; The described beam system 14 that contracts is made up of the second convex lens 14-1 and concavees lens 14-2, the beam ratio that contracts is 2: 1～3: 1, its effect is to make launching spot size and another road Stokes spot size approximately equal, be input to the light input end of the second convex lens 14-1 from the polarized light of the 3rd quarter wave plate 13 output, from inciding the light input end of the 3rd total reflective mirror 15 the light output end output terminal light of the second convex lens 14-1 contracts bundle by concavees lens 14-2 after; What described pulsed laser 1 was exported is the single longitudinal mode polarized light, and it can be linearly polarized light, elliptically polarized light or circularly polarized light, and its burst length waveform is Gaussian or nearly Gaussian, and its pulsewidth is 5～10ns, and energy is greater than 5mJ; The focal length of described first convex lens 7 is 10～15cm; The length in the described first medium pond 8 is 20～40cm, and the length in the described second medium pond 17 is 60～80cm, and identical Brillouin's medium is used with the second medium pond 17 in the first medium pond 8, promptly uses Brillouin's media such as CCl4, FC72, FC75; Described transmissibility of adjustable attenuation piece 10 is used for adjusting the energy of Stokes seed light, and the adjustable extent of its transmitance is 0.1～0.95; Described the 3rd polaroid 11 is used for extracting emergent light.
Embodiment two: referring to Fig. 1, Fig. 2 and Fig. 3, when this embodiment adopts apparatus for shaping described in the embodiment one and shaping methods, input pulse waveform as shown in Figure 2, the optical path difference that the two-beam that adjusting is divided into by 1/2 wave plate 2 and first polaroid 3 arrives the second medium pond 17 respectively is 0cm, it is 1: 1～2: 1 that the angle of rotating 1/2 wave plate 2 in the step 1 makes the splitting ratio through the two-way light of 3 transmissions of first polaroid and reflection, the transmitance of adjusting attenuator 10 is 0.50～0.70, can obtain flat-topped waveform as shown in Figure 3.
Embodiment three: referring to Fig. 1, Fig. 2 and Fig. 3, when this embodiment adopts apparatus for shaping described in the embodiment one and shaping methods, input pulse waveform as shown in Figure 2, the optical path difference that the two-beam that adjusting is divided into by 1/2 wave plate 2 and first polaroid 3 arrives the second medium pond 17 respectively is 120cm, it is 4: 1～5: 1 that the angle of rotating 1/2 wave plate 2 in the step 1 makes the splitting ratio through the two-way light of 3 transmissions of first polaroid and reflection, the transmitance of adjusting attenuator 10 is 0.50～0.70, also can obtain flat-topped waveform as shown in Figure 3.
Embodiment four: referring to Fig. 1, Fig. 2 and Fig. 4, when this embodiment adopts apparatus for shaping described in the embodiment one and shaping methods, input pulse waveform as shown in Figure 2, the optical path difference that the two-beam that adjusting is divided into by 1/2 wave plate 2 and first polaroid 3 arrives the second medium pond 17 respectively is 0cm, it is 1: 1～2: 1 that the angle of rotating 1/2 wave plate 2 in the step 1 makes the splitting ratio through the two-way light of 3 transmissions of first polaroid and reflection, the transmitance of adjusting attenuator 10 is 0.70～0.95, can obtain the high waveform of pulse back edge as shown in Figure 4.
Embodiment five: referring to Fig. 1, Fig. 2 and Fig. 4, when this embodiment adopts apparatus for shaping described in the embodiment one and shaping methods, input pulse waveform as shown in Figure 2, the optical path difference that the two-beam that adjusting is divided into by 1/2 wave plate 2 and first polaroid 3 arrives the second medium pond 17 respectively is 120cm, it is 4: 1～5: 1 that the angle of rotating 1/2 wave plate 2 in the step 1 makes the splitting ratio through the two-way light of 3 transmissions of first polaroid and reflection, the transmitance of adjusting attenuator 10 is 0.70～0.95, also can obtain the high waveform of pulse back edge as shown in Figure 4.
Embodiment six: referring to Fig. 1, Fig. 2 and Fig. 5, when this embodiment adopts apparatus for shaping described in the embodiment one and shaping methods, input pulse waveform as shown in Figure 2, the optical path difference that the two-beam that adjusting is divided into by 1/2 wave plate 2 and first polaroid 3 arrives the second medium pond 17 respectively is 0cm, it is 1: 1～2: 1 that the angle of rotating 1/2 wave plate 2 in the step 1 makes the splitting ratio through the two-way light of 3 transmissions of first polaroid and reflection, the transmitance of adjusting attenuator 10 is 0.1～0.5, can obtain the high waveform of pulse front edge as shown in Figure 5.
Embodiment seven: referring to Fig. 1, Fig. 2 and Fig. 5, when this embodiment adopts apparatus for shaping described in the embodiment one and shaping methods, input pulse waveform as shown in Figure 2, the optical path difference that the two-beam that adjusting is divided into by 1/2 wave plate 2 and first polaroid 3 arrives the second medium pond 17 respectively is 120cm, it is 4: 1～5: 1 that the angle of rotating 1/2 wave plate 2 in the step 1 makes the splitting ratio through the two-way light of 3 transmissions of first polaroid and reflection, the transmitance of adjusting attenuator 10 is 0.1～0.5, also can obtain the high waveform of pulse front edge as shown in Figure 5.
Claims (10)
1, laser pulse shaping device based on two-cell stimulated Brillouin scattering system, it is characterized in that described apparatus for shaping is by pulsed laser (1), 1/2 wave plate (2), first polaroid (3), second polaroid (4), first total reflective mirror (5), first quarter wave plate (6), first convex lens (7), the first medium pond (8), second total reflective mirror (9), transmissibility of adjustable attenuation piece (10), the 3rd polaroid (11), second quarter wave plate (12), the 3rd quarter wave plate (13), beam system (14) contracts, the 3rd total reflective mirror (15), the 4th total reflective mirror (16) and the second medium pond (17) are formed, the polarized light of pulsed laser (1) output is successively through being divided into two-beam behind 1/2 wave plate (2) and first polaroid (3), a branch of light is successively through the 3rd quarter wave plate (13), beam system (14) contracts, the 3rd total reflective mirror (15), incide an end (17-1) in the second medium pond (17) behind the 4th total reflective mirror (16), another Shu Guang is successively through second polaroid (4), first total reflective mirror (5), first quarter wave plate (6), incide behind first convex lens (7) and produce the Stokes seed light in the first medium pond (8), described Stokes seed light turns back to the light input end of second polaroid (4) along former road, described Stokes seed light after second polaroid (4) transmission successively through second total reflective mirror (9), transmissibility of adjustable attenuation piece (10), the 3rd polaroid (11), incide the other end (17-2) in the second medium pond (17) behind second quarter wave plate (12).
2,, it is characterized in that described shaping methods carries out according to the following steps based on the shaping for laser pulse method of two-cell stimulated Brillouin scattering system:
One, the polarized light of pulsed laser (1) output rotates the angular setting splitting ratio of 1/2 wave plate (2) by 1/2 wave plate (2) and first polaroid (3) beam splitting;
Two, through a branch of transmission-polarizing light of obtaining from the light output end of first polaroid (3) after the above-mentioned first step successively through inciding the light input end of the 3rd total reflective mirror (15) behind the 3rd quarter wave plate (13), the beam system that contracts (14), this polarized light incides an end (17-1) in the second medium pond (17) after by the 3rd total reflective mirror (15) and the 4th total reflective mirror (16) change light path;
Three, be input to the light input end of second polaroid (4) through another bundle reflect polarized light that obtains from the light input end of first polaroid (3) after the above-mentioned first step, this polarized light incides the light input end of first total reflective mirror (5) after second polaroid (4) reflection, this polarized light changes the light input end that impinges perpendicularly on first quarter wave plate (6) after the light path by first total reflective mirror (5), and the light beam that obtains from the light output end of first quarter wave plate (6) incides the first medium pond (8) after first convex lens (7) focus on and produces the Stokes seed light;
Four, the Stokes seed light that above-mentioned the 3rd step produces is successively through first convex lens (7), first quarter wave plate (6), be input to the light input end of second polaroid (4) behind first total reflective mirror (5), this Stokes seed light is through the light input end that incides second total reflective mirror (9) behind second polaroid (4), this Stokes seed light is passed through the light input end that transmissibility of adjustable attenuation piece (10) incides the 3rd polaroid (11) again after second total reflective mirror (9) changes light path, the transmitted light that obtains at the light output end of the 3rd polaroid (11) incides the other end (17-2) in the second medium pond (17) by second quarter wave plate (12), the transmitance of adjusting described transmissibility of adjustable attenuation piece (10) changes the energy of described Stokes seed light, and the optical axis of the two-beam of incident overlaps respectively from the two ends in the second medium pond (17);
Five, the light beam that incides two ends, the second medium pond (17) interacts in the second medium pond (17), be transmitted to the other end (17-2) of medium pond (17) from an end (17-1) of medium pond (17) by one road light of the 4th total reflective mirror (16) reflection, in this process this road light through with the other end (17-2) output of back that interacts of Stokes seed light from the other end (17-2) incident in the second medium pond (17) from the second medium pond (17), the above-mentioned light of exporting from the other end (17-2) in the second medium pond (17) is reflected by the 3rd polaroid (11) after second quarter wave plate (12) changes polarization state, and the described light that is reflected by the 3rd polaroid (11) is the light with required pulse waveform.
3, the shaping for laser pulse method based on two-cell stimulated Brillouin scattering system according to claim 2 is characterized in that all polaroids place by Brewster angle.
4, the shaping for laser pulse method based on two-cell stimulated Brillouin scattering system according to claim 2, it is characterized in that the described beam system that contracts (14) is made up of second convex lens (14-1) and concavees lens (14-2), the beam ratio that contracts is 2: 1～3: 1, be input to the light input end of second convex lens (14-1) from the polarized light of the 3rd quarter wave plate (13) output, contract by concavees lens (14-2) from the light of the light output end output of second convex lens (14-1) and incide the light input end of the 3rd total reflective mirror (15) after restrainting.
5, according to claim 2,3 or 4 described shaping for laser pulse methods based on two-cell stimulated Brillouin scattering system, the adjustable extent that it is characterized in that the transmitance of described transmissibility of adjustable attenuation piece (10) is 0.1～0.95.
6, according to claim 2,3 or 4 described shaping for laser pulse methods based on two-cell stimulated Brillouin scattering system, what it is characterized in that described pulsed laser (1) output is the single longitudinal mode polarized light, and described single longitudinal mode polarized light is linearly polarized light, elliptically polarized light or circularly polarized light.
7, according to claim 2,3 or 4 described shaping for laser pulse methods based on two-cell stimulated Brillouin scattering system, the optical path difference that it is characterized in that being arrived respectively by the two-beam that 1/2 wave plate (2) and first polaroid (3) are divided into the second medium pond (17) is 0～120cm, and the light ratio that arrives the other end (17-2) in the second medium pond (17) to arrive the light path of light of an end (17-1) in the second medium pond (17) little.
8,, it is characterized in that described first medium pond (8) and the identical Brillouin's medium of the second medium pond (17) use according to claim 2,3 or 4 described shaping for laser pulse methods based on two-cell stimulated Brillouin scattering system.
9, the shaping for laser pulse method based on two-cell stimulated Brillouin scattering system according to claim 7, it is 1: 1～5: 1 that the angle that it is characterized in that in the step 1 rotating 1/2 wave plate (2) makes the two-way light splitting ratio through (3) transmission of first polaroid and reflection.
10, the shaping for laser pulse method based on two-cell stimulated Brillouin scattering system according to claim 8 is characterized in that the described first medium pond (8) and the second medium pond (17) use CCl
4, a kind of among FC72, the FC75.
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| JPH05102618A (en) * | 1991-10-04 | 1993-04-23 | Toshiba Corp | Short pulse laser generating device |
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| CN100385331C (en) | 2008-04-30 |
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