CN105024273A - Intra-cavity laser shaping realization method by means of stimulated Brillouin scattering and device thereof - Google Patents
Intra-cavity laser shaping realization method by means of stimulated Brillouin scattering and device thereof Download PDFInfo
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- CN105024273A CN105024273A CN201410167905.8A CN201410167905A CN105024273A CN 105024273 A CN105024273 A CN 105024273A CN 201410167905 A CN201410167905 A CN 201410167905A CN 105024273 A CN105024273 A CN 105024273A
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Abstract
The invention provides an intra-cavity laser shaping realization method by means of a stimulated Brillouin scattering technology and a device thereof, and relates to a laser device light beam quality control and shaping technology so that light beam quality improvement of one or multiple laser devices can be realized. Concretely, one Brillouin medium gain pool is arranged at the position of beam waist, a focus or a smaller light spot in a laser resonator, and two 1/4 wave plates are arranged at the two sides of the Brillouin medium gain pool and one polarization beam splitting element is arranged at one side of a laser gain medium so that stimulated Brillouin scattering light can be outputted. The laser polarization state can also be selected by the method.
Description
Technical field
The present invention is a kind of method and apparatus utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping, relevant with shaping technique with the Laser beam quality control of laser, can realize the beamquality improvement to one or more lasers.
Background technology
The beam quality of laser is the important performance characteristic of laser, and high-quality laser beam requires the less angle of divergence, better laser energy uniformity and light distortion little as far as possible.The control of laser beam quality and ameliorative way can be divided into two large classes, a kind of is optimize the heat management of laser and cavity effects etc., be deteriorated from causing laser beam quality or produce the reason of laser distortion, reduce or eliminate unfavorable factor, improving beam quality; Another kind of scheme adopts the methods such as nonlinear optical technique, adopts the technology such as phase conjugation to the wavefront distortion of laser or defocus focusing etc. and compensate, reaching the improvement to beam quality.
In the above-mentioned methods, adopt optimize laser heat management and the way of cavity effects very difficult, and be limited by the technical merit of Laser Devices, therefore start with from these class methods and improve beam quality and make slow progress.The method adopting non-linear optical methods to improve beam quality mostly is stimulated Brillouin scattering outside chamber, owing to generally adopting single or passing twice through brillouin gain pond, and therefore beamquality improvement limited efficiency.
The present invention adopts a kind of method increasing excited Brillouin active medium in laserresonator, and devises corresponding device, by stimulated Brillouin scattering in chamber, improves the beam quality of laser.The method that the present invention adopts can also select laser polarization state.
Summary of the invention
For the better more convenient output beam quality improving laser, propose a kind of method increasing excited Brillouin active medium in laserresonator, and devise corresponding device, by stimulated Brillouin scattering in chamber, improve the beam quality of laser.Specific design scheme of the present invention is as follows:
A kind of method utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping, comprise the laserresonator be made up of two total reflective mirrors and the gain medium between them, specifically: Brillouin's medium gain pond is placed on the with a tight waist of laser resonance intracavity beam, focus or the minimum position of hot spot, Brillouin's medium gain pond enter light window and light-emitting window is in the light path in laserresonator, Brillouin's medium gain pond is positioned at the side of gain medium, and place quarter wave plate respectively in both sides, Brillouin's medium gain pond, a polarization beam splitter is placed in the side of gain medium, gain medium is adjacent with polarization beam splitter, stimulated Brillouin scattering light can export by polarization beam splitter.Gain medium is adjacent with polarization beam splitter to be referred to and places polarization beam splitter at gain medium away from the side in Brillouin's medium gain pond; Or place polarization beam splitter in the side near Brillouin's medium gain pond.
The method that the present invention adopts can also select laser polarization state, be linearly polarized light without laser during Brillouin's medium, stimulated Brillouin scattering light does not change laser polarization state, backward Brillouin scattering light becomes the polarization direction linearly polarized light vertical with former laser polarization direction after quarter wave plate, therefore can by polarization spectro element by backward SBS light output, the laser that the method exports is linearly polarized light.
In the present invention, need Brillouin scattering medium gain pond to be positioned over the less position of hot spot in laser cavity, can laser power density be increased, improve stimulated Brillouin scattering efficiency.
For realizing method presented above, devising the device adopting stimulated Brillouin scattering technology to realize endovenous laser shaping, comprising laserresonator, Brillouin's active medium and polarizer; Be placed with left side successively along optical axis direction to be all-trans chamber mirror, gain medium, polarization beam splitter, the first quarter wave plate, brillouin gain pond, be all-trans chamber mirror for the second quarter wave plate and right side.The polarization beam splitter adopted in this device can be Brewster window, Glan prism or polarization spectro sheet.In the present invention, polarization beam splitter can also be placed on gain medium near brillouin gain medium side, now also can realize the object of shaping in chamber, but effect is good not as being placed on away from brillouin gain medium side.
Accompanying drawing explanation
Fig. 1 is the structure drawing of device that the employing stimulated Brillouin scattering technology that the present invention relates to realizes endovenous laser shaping;
In figure: 1-left chamber mirror (total reflection), 2-polarization beam splitter, 3-gain medium, the 4-the first quarter wave plate, 5-brillouin gain medium, the 6-the second quarter wave plate, 7-right chamber mirror (total reflection).In figure, double-head arrow solid line represents laser in interior resonance direction, chamber, band arrow represented by dotted arrows stimulated Brillouin scattering light outbound course;
Fig. 2 is the structure drawing of device of the another kind of scheme that the present invention adopts;
In figure: 1-left chamber mirror (total reflection), 2-polarization beam splitter, 3-gain medium, the 4-the first quarter wave plate, 5-brillouin gain medium, the 6-the second quarter wave plate, 7-right chamber mirror (total reflection).In figure, double-head arrow solid line represents laser in interior resonance direction, chamber, band arrow represented by dotted arrows stimulated Brillouin scattering light outbound course.
Embodiment
By reference to the accompanying drawings, citing is specifically described the specific embodiment of the present invention below.
Embodiment 1
SF6 is adopted to improve as the beam quality of Brillouin's active medium to Nd:YAG laser.
In the optical cavity of Nd:YAG laser, add one and be full of SF
6stimulated Brillouin scattering pond, specific experiment device is, Brillouin's medium gain pond is placed in laserresonator, as shown in accompanying drawing 1 or 2, the left side of YAG crystal is be all-trans chamber mirror in a left side, and a Glan prism is placed on the right side of YAG crystal, places a quarter wave plate on the right side of Glan prism, Brillouin's medium gain pond is placed on right side again, is filled with 20 atmospheric SF in gain pond
6, a quarter wave plate is placed on the right side in Brillouin's medium gain pond, and the outside of rightmost side quarter wave plate is also the chamber mirror that is all-trans.In the self-oscillating of YAG laser, due to the existence of Glan prism, the polarization state without the basic frequency laser of stimulated Brillouin scattering improvement is horizontal linear polarization, vibrates, therefore can not export from laser cavity between two chamber mirrors; The backward SBS that YAG laser produces through Brillouin's medium gain pond does not change polarization state, perpendicular linear polarization state is changed into after the quarter wave plate of left side, can export through Glan prism, because stimulated Brillouin scattering can distort by compensation of phase, therefore its beam quality is better than fundamental frequency light, adopts the beam quality that can improve Nd:YAG laser in this way.PRELIMINARY RESULTS shows, adopts the present invention can improve yag laser beam quality, by the M of outgoing laser beam
2the factor brings up to 2 by 2.5, and improves output facula energy distribution of laser, and RMS brings up to 1.5% by 2.5%.
Claims (7)
1. the method utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping, comprise the laserresonator with gain medium, it is characterized in that: Brillouin's medium gain pond is placed on the with a tight waist of laser resonance intracavity beam, focus or the minimum position of hot spot, Brillouin's medium gain pond enter light window and light-emitting window is in the light path in laserresonator, Brillouin's medium gain pond is positioned at the side of gain medium, and place quarter wave plate respectively in both sides, Brillouin's medium gain pond, a polarization beam splitter is placed in the side of gain medium, gain medium is adjacent with polarization beam splitter, stimulated Brillouin scattering light can export by polarization beam splitter.
2., according to the method utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping according to claim 1, it is characterized in that:
A polarization beam splitter is placed in the described side at gain medium, and gain medium is adjacent with polarization beam splitter to be referred to:
A polarization beam splitter is placed away from the side in Brillouin's medium gain pond at gain medium;
Or, place a polarization beam splitter at gain medium near the side in Brillouin's medium gain pond, namely between gain medium and Brillouin's medium gain pond, be disposed with polarization beam splitter and quarter wave plate.
3. the device utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping, comprise the laserresonator with gain medium, it is characterized in that: Brillouin's medium gain pond is placed on the with a tight waist of laser resonance intracavity beam, focus or the minimum position of hot spot, Brillouin's medium gain pond enter light window and light-emitting window is in the light path in laserresonator, Brillouin's medium gain pond is positioned at the side of gain medium, and place quarter wave plate respectively in both sides, Brillouin's medium gain pond, a polarization beam splitter is placed in the side of gain medium, gain medium is adjacent with polarization beam splitter.
4., according to the device utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping according to claim 3, it is characterized in that:
A polarization beam splitter is placed in the described side at gain medium, and gain medium is adjacent with polarization beam splitter to be referred to:
A polarization beam splitter is placed away from the side in Brillouin's medium gain pond at gain medium;
Or, place a polarization beam splitter at gain medium near the side in Brillouin's medium gain pond, namely between gain medium and Brillouin's medium gain pond, be disposed with polarization beam splitter and quarter wave plate.
5. according to the device utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping according to claim 3, it is characterized in that: laserresonator is made up of two total reflective mirrors and the gain medium between them.
6. according to the device utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping according to claim 3, it is characterized in that: polarization beam splitter is Glan prism or polarization spectro sheet.
7., according to the device utilizing stimulated Brillouin scattering technology to realize endovenous laser shaping according to claim 3, it is characterized in that: comprise laserresonator, Brillouin's active medium and polarizer; Be placed with left side successively along optical axis direction to be all-trans chamber mirror, polarization beam splitter, gain medium, quarter wave plate, brillouin gain pond, be all-trans chamber mirror for quarter wave plate and right side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410167905.8A CN105024273A (en) | 2014-04-24 | 2014-04-24 | Intra-cavity laser shaping realization method by means of stimulated Brillouin scattering and device thereof |
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| CN201410167905.8A CN105024273A (en) | 2014-04-24 | 2014-04-24 | Intra-cavity laser shaping realization method by means of stimulated Brillouin scattering and device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262124A (en) * | 2020-03-06 | 2020-06-09 | 河北工业大学 | Brillouin laser |
| US11362480B2 (en) | 2020-06-03 | 2022-06-14 | Honeywell International Inc. | Self-injection locked stimulated Brillouin scattering laser |
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| US4709368A (en) * | 1985-09-24 | 1987-11-24 | The United States Of America As Represented By The Secretary Of The Army | Side-arm phase-conjugated laser |
| US4734911A (en) * | 1986-03-14 | 1988-03-29 | Hughes Aircraft Company | Efficient phase conjugate laser |
| US4972156A (en) * | 1989-06-28 | 1990-11-20 | Hughes Aircraft Company | Phase conjugate laser with a temporal square pulse |
| US5034950A (en) * | 1989-03-17 | 1991-07-23 | The State Of Israel, Atomic Energy Commission, Soreq Nuclear Research Center | Non-linear isolator based on stimulated Brillouin scattering for a laser apparatus |
| DE4009116A1 (en) * | 1990-03-19 | 1991-09-26 | Festkoerper Laser Inst Berlin | Polarised solid-state laser - has phase-conjugate SBS mirrors with use of differential thresholds to sustain stable emission |
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2014
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| US4709368A (en) * | 1985-09-24 | 1987-11-24 | The United States Of America As Represented By The Secretary Of The Army | Side-arm phase-conjugated laser |
| US4734911A (en) * | 1986-03-14 | 1988-03-29 | Hughes Aircraft Company | Efficient phase conjugate laser |
| US5034950A (en) * | 1989-03-17 | 1991-07-23 | The State Of Israel, Atomic Energy Commission, Soreq Nuclear Research Center | Non-linear isolator based on stimulated Brillouin scattering for a laser apparatus |
| US4972156A (en) * | 1989-06-28 | 1990-11-20 | Hughes Aircraft Company | Phase conjugate laser with a temporal square pulse |
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| US5260954A (en) * | 1992-10-29 | 1993-11-09 | The Unived States Of America As Represented By The United States Department Of Energy | Pulse compression and prepulse suppression apparatus |
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Non-Patent Citations (1)
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| S.SEIDEL等: "Pulse lengthening by intracavity stimulated Brillouin scattering in a Q-switched, phase-conjugated Nd:YAG laser oscillator", 《APPLIED OPTICS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262124A (en) * | 2020-03-06 | 2020-06-09 | 河北工业大学 | Brillouin laser |
| US11362480B2 (en) | 2020-06-03 | 2022-06-14 | Honeywell International Inc. | Self-injection locked stimulated Brillouin scattering laser |
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Application publication date: 20151104 |