CN105811231A - Volume Bragg grating high-energy pisosecond laser - Google Patents
Volume Bragg grating high-energy pisosecond laser Download PDFInfo
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- CN105811231A CN105811231A CN201610298126.0A CN201610298126A CN105811231A CN 105811231 A CN105811231 A CN 105811231A CN 201610298126 A CN201610298126 A CN 201610298126A CN 105811231 A CN105811231 A CN 105811231A
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- laser
- bragg grating
- volume bragg
- big energy
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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
- H01S3/05—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/115—Q-switching using intracavity electro-optic devices
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- Optics & Photonics (AREA)
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Abstract
The invention relates to the technical field of laser, in particular to a volume Bragg grating (VBG) high-energy pisosecond laser. The laser disclosed by the invention comprises a box, wherein two parallel VBG end mirrors are separately arranged at the two ends of the interior of the box to form an optical resonant cavity, an electro-optical switch, a polarizing film, a saturable absorber, a gain pumping module and a concave lens are sequentially arranged in the optical resonant cavity, the gain pumping module is used for strong pumping on a laser crystal to generate oscillation light, the oscillation light is gradually compressed to a short pulse under the effect of the saturable absorber, and meanwhile, the pulse with is further compressed under the effect of the VBG end mirrors. At the maximum pulse energy moment, high voltage is applied to the electro-optical switch, high-energy pisosecond pulse is output through the polarizing film and a full-reflection mirror by a cavity dumping technology to obtain high-energy pisosecond pulse laser, and thus, the problems of large size, device complexity and low stability of the high-energy pisosecond laser at the current stage are solved.
Description
Technical field
The present invention relates to laser technology field, in particular to a kind of big energy picosecond laser of Volume Bragg grating.
Background technology
Picosecond laser is in industrial processes, surface modification treatment, and the application of the field such as satellite ranging, life sciences is more and more extensive.The various metabolism times of life entity are about 10-12S, adopts picopulse light can affect the metabolism of this time period, and thus, in life sciences is respectively studied, picosecond laser is widely used, its research to mammalian cell DAN, and favourable has promoted mankind's understanding to oneself.Ps Laser Pulse is narrow, and the intensity of light is big, and range accuracy is high, and far measuring distance, in satellite ranging, its precision is up to 3mm.In the psec course of processing, producing heat few, machining accuracy is high, and material does not have selectivity, and impact strength is big, is widely used in micro-nano technology and material surface modifying.Meanwhile, picosecond laser is also effective pumping source of laser frequency conversion.
Under normal circumstances, the picopulse of big energy, generally first being produced repetition rate by locked mode is hundred megahertzs, pulse, for receiving burnt magnitude picopulse seed light, then carries out regenerative amplification, it is thus achieved that the picopulse of single pulse energy MJ level, traveling wave is adopted to amplify again, it is thus achieved that the picopulse of higher energy.Mode-Locking Cavity length is more long, and pattern count is more many, more easily realizes locked mode, under the loss considering chamber, general stable mode-locking chamber length is about 1.5m, and in regenerative amplification chamber, by the electrooptical switching restriction that switch time, (about 5ns) acted on, general chamber is up to about 1.2m.Thus, locked mode adds regenerative amplification and obtains the picopulse of big energy, and laser instrument volume is big, and device is complicated, and stability also declines therewith.
Summary of the invention
It is an object of the invention to a kind of big energy picosecond laser of Volume Bragg grating, to solve the problem that laser instrument volume is big, device is complicated, stability is low of the picopulse of the big energy of present stage acquisition.
The invention provides a kind of big energy picosecond laser of Volume Bragg grating, comprising:
Casing, two parallel Volume Bragg grating end mirror VBG are separately positioned on the two ends of described box house, constitute optical resonator, are disposed with electrooptical switching, polaroid, saturated absorbing body and gain pump module at described optical resonance intracavity；Being provided with total reflective mirror on the reflected light path of described polaroid, described total reflective mirror is for exporting the laser that described laser instrument produces by laser output, and described laser output is arranged on described casing；
Described casing is additionally provided with more than one electric connection terminal interface, described electrooptical switching and gain pump module and is connected to electric supply installation respectively through terminals interface.
In certain embodiments, it is preferred to, described Volume Bragg grating end mirror VBG, saturated absorbing body and gain pump module be placed on heat sink in.Described heat sink for miniature fin, it is logical supercooled water or cools down gas-cooled device, described casing is provided with cool cycles interface.
Described gain pump module is continuous pumping or quasi-cw pumping.When described gain pump module is quasi-cw pumping, the alive frequency of described electrooptical switching institute is consistent with quasi-cw pumping frequency.
Further, described optical resonance intracavity is additionally provided with quarter-wave plate, and described gain pump module, concavees lens and described quarter-wave plate set gradually.Described Volume Bragg grating end mirror VBG, polaroid, saturated absorbing body, concavees lens, quarter-wave plate, total reflective mirror are plated with the anti-reflection film consistent with the wave band of oscillation light or highly reflecting films with the laser crystal in pumping gain module.
Described optical resonance intracavity is additionally provided with aperture, and described aperture is arranged between described voltage device and described polaroid；Described aperture aperture, less than the size of described gain pump module inner laser crystal, is used for suppressing high-order mode to vibrate, and improves beam quality.
Described total reflective mirror is 45 ° of total reflective mirrors.
The big energy picosecond laser of Volume Bragg grating that the embodiment of the present invention provides, compared with prior art, the Volume Bragg grating end mirror VBG that two ends in casing be arranged in parallel forms optical resonator, is disposed with electrooptical switching, polaroid, saturated absorbing body and gain pump module at optical resonance intracavity.Utilizing gain pump module that laser crystal carries out heavy pumping and produce oscillation light, oscillation light gradually reduces under the effect of saturated absorbing body and rushes into short pulse.And, this laser instrument is additionally provided with concavees lens, the thermal lens that concavees lens compensating gain pump module is quoted by heat effect, it is ensured that the size of vibration hot spot in resonator cavity, it is to avoid hot spot is too small, device failure during big energy.Meanwhile, under the effect of the Volume Bragg grating end mirror VBG be arrangeding in parallel at two ends, pulsewidth is compressed further.When pulse energy is maximum, electrooptical switching adds high pressure, namely by cavity dumping technology, by big energy picopulse by polaroid and light microscopic output of being all-trans.Therefore, the problem that laser instrument volume is big, device is complicated, stability is low of the picopulse of the big energy of present stage acquisition is effectively solved.
Accompanying drawing explanation
Fig. 1 is the big energy picosecond laser structural representation of Volume Bragg grating in one embodiment of the invention；
Fig. 2 is Volume Bragg grating big energy picosecond laser case-side view in one embodiment of the invention；
Fig. 3 is Volume Bragg grating big energy picosecond laser case-side view in one embodiment of the invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
Obtain the problem that laser instrument volume is big, device is complicated, stability is low of the picopulse of big energy for present stage, the present invention proposes a kind of big energy picosecond laser of Volume Bragg grating.As shown in Figure 1, Figure 2, Figure 3 shows, it specifically includes:
Casing, two parallel Volume Bragg grating end mirror VBG are separately positioned on the two ends of box house, constitute optical resonator, are disposed with electrooptical switching 2, polaroid 4, saturated absorbing body 5 and gain pump module 6, concavees lens 7 at optical resonance intracavity.The thermal lens that concavees lens 7 are quoted for compensating gain pump module heat effect, it is ensured that the size of vibration hot spot in resonator cavity, it is to avoid hot spot is too small, device failure during big energy.Being provided with total reflective mirror 10 on the reflected light path of polaroid 4, total reflective mirror 10 is exported by laser output 14 for the laser produced by laser instrument, and laser output 14 is arranged on casing.Casing is additionally provided with more than one electric connection terminal interface 12, electrooptical switching and gain pump module and is connected to electric supply installation by electric connection terminal interface 12.
For laser instrument, Q-value is more high, and its loss is more little, and efficiency is more high.And when gain pump module starts pumping laser work, resonator cavity is constantly in high loss state, laser cannot set up vibration in resonator cavity, until when upper level inversion population reaches maximum, switch Guan Bi, plus high pressure, then cavity loss is become low-loss from high loss rapidly, and laser is in intracavity starting of oscillation.Although adjusting Q to obtain short pulse rush device simply, volume is little, but generally can only obtain the short pulse punching of nanosecond or subnanosecond level, thereby tends to limit short cavity and adjusts the application in picopulse production process of the Q process.Volume Bragg grating (VBG) is widely used in the broadening and compression of pulsewidth, particularly in picopulse.Active and passive Q-adjusted cavity dumping is combined by patent of the present invention cleverly with Volume Bragg grating (VBG), using the VBG two end mirrors as resonator cavity, to pulse produced by saturated absorbing body at the many second compression of intracavity, exports through cavity dumping after.
When electrooptical switching 2 does not add high pressure, gain pump module 6 adds electric current pumping, then endovenous laser vibration produces oscillation light, and oscillation light gradually reduces under the effect of saturated absorbing body 5 and rushes into short pulse, short pulse is punched in intracavity vibration and amplifies, and pulse width adjusts Q process to shorten gradually with saturated absorbing body 5.In oscillatory process, through the compression of Volume Bragg grating end mirror 1 and Volume Bragg grating end mirror 9, pulsewidth is further narrow as.Then, exporting through electro-optical cavity dumping, it may be assumed that in the pulse energy maximum moment, electrooptical switching 2 is plus high pressure, and big energy Ps Laser Pulse exports from polaroid 4, reflects through total reflective mirror 10, then exports from casing right flank delivery outlet 14.In the present embodiment, total reflective mirror is 45 ° of total reflective mirrors, and pulse, before this through an electrooptical switching 2, becomes circularly polarized light, produces the phase contrast of pi/2.Afterwards through the reflection of Volume Bragg grating end mirror 1, circularly polarized light again passes by electrooptical switching 2, becomes line polarized light, produces again the phase contrast of pi/2.Polarized light twice is through electrooptical switching 2, and the phase contrast of the raw π of common property, its polarization direction has deflected 90 ° altogether, just vertical with the polarization direction of deflection film.The application is in cavity dumping, have employed saturated absorbing body 5 and Volume Bragg grating end mirror simultaneously and pulse is carried out dual many second compression, obtaining pulsewidth can less than the pulsewidth of 2L/C (L is laser cavity length), breach the restriction to pulsewidth in cavity dumping, thus through polaroid and 45 ° of total reflective mirror reflections, exporting the big energy picosecond laser of tens to hundreds of psec from laser output.
Wherein, gain pump module can be continuous pump Pu, it is also possible to be quasi-cw pumping.When gain pump module 6 is continuous pumping, electric voltage frequency added by it determined according to demand by electrooptical switching 2.When gain pump mould 6 pieces is quasi-cw pumping, the alive frequency of electrooptical switching 2 institute is consistent with quasi-cw pumping frequency.
In gain pump module 6, laser crystal is carried out in heavy pumping, the depolarization that in laser crystal, thermally induced birefringence causes is stronger with thermal lens, thus optical resonance intracavity is additionally provided with quarter-wave plate 8, gain pump module, concavees lens and described quarter-wave plate set gradually, and wherein quarter-wave plate is for compensating the hot depolarization that pumping gain module is caused by heat effect.Meanwhile, optical resonance intracavity is additionally provided with aperture, and aperture is arranged between electrooptical switching and polaroid；Aperture aperture, less than the size of gain pump module inner laser crystal, is used for suppressing high-order mode to vibrate, and improves beam quality.
Volume Bragg grating end mirror VBG, saturated absorbing body and gain pump module be placed on heat sink in.Heat sink for miniature fin, it is logical supercooled water or cools down gas-cooled device.Owing to the picosecond laser energy of output is relatively big, power is high, then require higher to the thermal diffusivity of Laser Devices.Particularly to absorb laser many for saturated absorbing body 5, and heat accumulation is big, if dispelling the heat not in time, absorber absorbs heat, and temperature rises too high easy fragmentation.Volume Bragg grating VBG temperature influence is big, if the heat absorbed can not leave in time, affects the effect of Pulse Compression.It is therefore desirable to all above-mentioned device to be carried out cooling radiating treatment.
Volume Bragg grating end mirror VBG, polaroid, saturated absorbing body, concavees lens, quarter-wave plate, total reflective mirror are plated with the anti-reflection film consistent with the wave band of oscillation light or highly reflecting films with the laser crystal in pumping gain module, promote and penetrate or reflecting effect.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (9)
1. the big energy picosecond laser of Volume Bragg grating, it is characterised in that including:
Casing, two parallel Volume Bragg grating end mirror VBG are separately positioned on the two ends of described box house, constitute optical resonator, are disposed with electrooptical switching, polaroid, saturated absorbing body and gain pump module, concavees lens at described optical resonance intracavity；
Being provided with total reflective mirror on the reflected light path of described polaroid, described total reflective mirror is for exporting the laser that described laser instrument produces by laser output, and described laser output is arranged on described casing；
Described casing is additionally provided with more than one electric connection terminal interface, described electrooptical switching and gain pump module and connects electric supply installation respectively through terminals interface.
2. the big energy picosecond laser of Volume Bragg grating as claimed in claim 1, it is characterised in that described Volume Bragg grating end mirror VBG, saturated absorbing body and gain pump module be placed on heat sink in.
3. the big energy picosecond laser of Volume Bragg grating as claimed in claim 2, it is characterised in that described heat sink for miniature fin, is provided with cooling water circulation pipeline or gas cool cycles pipeline, described casing is provided with cool cycles interface in miniature fin.
4. the big energy picosecond laser of Volume Bragg grating as claimed in claim 1, it is characterised in that described gain pump module is continuous pumping or quasi-cw pumping.
5. the big energy picosecond laser of Volume Bragg grating as claimed in claim 4, it is characterised in that described gain pump module is quasi-cw pumping, the alive frequency of described electrooptical switching institute is consistent with quasi-cw pumping frequency.
6. the big energy picosecond laser of Volume Bragg grating as claimed in claim 1, it is characterised in that described optical resonance intracavity is additionally provided with quarter-wave plate, and described gain pump module, concavees lens and described quarter-wave plate set gradually.
7. the big energy picosecond laser of Volume Bragg grating as claimed in claim 6, it is characterized in that, described Volume Bragg grating end mirror VBG, polaroid, saturated absorbing body, concavees lens, quarter-wave plate, total reflective mirror are plated with the anti-reflection film consistent with the wave band of oscillation light or highly reflecting films with the laser crystal in pumping gain module.
8. the big energy picosecond laser of Volume Bragg grating as claimed in claim 1, it is characterised in that described optical resonance intracavity is additionally provided with aperture, and described aperture is arranged between described electrooptical switching and described polaroid；Described aperture aperture is less than the size of described gain pump module inner laser crystal.
9. the big energy picosecond laser of Volume Bragg grating as claimed in claim 1, it is characterised in that described total reflective mirror is 45 ° of total reflective mirrors.
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| CN201610298126.0A CN105811231B (en) | 2016-05-06 | 2016-05-06 | A kind of big energy picosecond laser of volume Bragg grating |
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| CN201610298126.0A CN105811231B (en) | 2016-05-06 | 2016-05-06 | A kind of big energy picosecond laser of volume Bragg grating |
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| CN105811231B CN105811231B (en) | 2018-06-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046219A (en) * | 2017-04-18 | 2017-08-15 | 中国工程物理研究院激光聚变研究中心 | A kind of chirp Volume Bragg grating cooling system and cooling means |
| CN107900032A (en) * | 2017-11-20 | 2018-04-13 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | A kind of picosecond laser cleaning device |
| CN111313221A (en) * | 2020-03-19 | 2020-06-19 | 长春理工大学 | Laser for directly generating double-path coherent light |
| CN111509550A (en) * | 2020-04-20 | 2020-08-07 | 中国科学院上海光学精密机械研究所 | High-peak power narrow linewidth 1064nm all-solid-state pulse laser |
| CN112448254A (en) * | 2020-11-12 | 2021-03-05 | 中国航空工业集团公司洛阳电光设备研究所 | Bragg body grating coupled output double-rod tandem laser |
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| US20080013586A1 (en) * | 2005-09-06 | 2008-01-17 | Spence David E | Narrow band diode pumping of laser gain materials |
| CN104767108A (en) * | 2015-04-27 | 2015-07-08 | 北京工业大学 | Regenerative amplifier provided with multiplied resonator cavity |
| CN204793601U (en) * | 2015-06-25 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | 1. 75 thulium fiber laser is mixed to mu m narrow linewidth |
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2016
- 2016-05-06 CN CN201610298126.0A patent/CN105811231B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080013586A1 (en) * | 2005-09-06 | 2008-01-17 | Spence David E | Narrow band diode pumping of laser gain materials |
| CN104767108A (en) * | 2015-04-27 | 2015-07-08 | 北京工业大学 | Regenerative amplifier provided with multiplied resonator cavity |
| CN204793601U (en) * | 2015-06-25 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | 1. 75 thulium fiber laser is mixed to mu m narrow linewidth |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046219A (en) * | 2017-04-18 | 2017-08-15 | 中国工程物理研究院激光聚变研究中心 | A kind of chirp Volume Bragg grating cooling system and cooling means |
| CN107046219B (en) * | 2017-04-18 | 2023-10-24 | 中国工程物理研究院激光聚变研究中心 | Cooling system and cooling method for chirped Bragg grating |
| CN107900032A (en) * | 2017-11-20 | 2018-04-13 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | A kind of picosecond laser cleaning device |
| CN107900032B (en) * | 2017-11-20 | 2019-10-01 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | A kind of picosecond laser cleaning device |
| CN111313221A (en) * | 2020-03-19 | 2020-06-19 | 长春理工大学 | Laser for directly generating double-path coherent light |
| CN111509550A (en) * | 2020-04-20 | 2020-08-07 | 中国科学院上海光学精密机械研究所 | High-peak power narrow linewidth 1064nm all-solid-state pulse laser |
| CN112448254A (en) * | 2020-11-12 | 2021-03-05 | 中国航空工业集团公司洛阳电光设备研究所 | Bragg body grating coupled output double-rod tandem laser |
| CN112448254B (en) * | 2020-11-12 | 2022-11-22 | 中国航空工业集团公司洛阳电光设备研究所 | Bragg body grating coupled output double-rod tandem laser |
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Effective date of registration: 20230925 Address after: 100044 109, building 7, No. 28, gaoliangqiaoxie street, Haidian District, Beijing Patentee after: BEIJING YINGKE TECHNOLOGY CO.,LTD. Address before: 100124 No. 100 Chaoyang District Ping Tian Park, Beijing Patentee before: Beijing University of Technology |