CN104184036A - Multifunctional light beam reverser - Google Patents
Multifunctional light beam reverser Download PDFInfo
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- CN104184036A CN104184036A CN201410464536.9A CN201410464536A CN104184036A CN 104184036 A CN104184036 A CN 104184036A CN 201410464536 A CN201410464536 A CN 201410464536A CN 104184036 A CN104184036 A CN 104184036A
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Abstract
The invention provides a multifunctional light beam reverser. According to the multifunctional light beam reverser, a laser beam emitted out by a laser enters a lens III through a reflector I and a reflector II and is converted into parallel light, and a large-diameter light beam in a main magnifier is converted into a medium-diameter light beam so that the light beam can be conveniently transmitted in the multifunctional light beam reverser; parallel beams enter a 90-degree angle turning body formed by a reflector III, a reflector IV and an emitting lens V after passing through an electro-optical switch which is conductive to main laser pulses and isolative to self-oscillation and anti-lasers; the 90-degree angle turning body carries out 90-degree rotation on a near field and the polarization state of the parallel beams; the parallel beams are converged through a lens IV, and then are guided out through a reflector IV and a reflector VII. When the multifunctional light beam reverser is adopted, the energy output characteristic of a system is improved; astigmatism is converted into out-of-focus, and the far-field quality of output light beams of the system can be obviously improved further through lens focusing compensation.
Description
Technical field
The invention belongs to high power laser light technical field, be specifically related to a kind of multifunctional light beam inversion device for multi pass amplifier system.
Background technology
At present, multiple countries are building the device of high power laser for inertial confinement fusion (Inertial Confinement Fusion, ICF) research in the world, and have adopted one after another the general technical route of " square beam of light+multipass amplifies "." square beam of light " refers to that changing laser aid into multi beam array by the single beam design in past designs, to further improve disk amplifier xenon flash lamp pumping efficiency, thereby improve system stored energy efficiency, corresponding unit block or module (as spatial filter, the electrooptical switching etc.) combining structures that adopt more; Meanwhile, adopt combined structure design can reduce system bulk, be conducive to dwindle installing space; In addition, change the circular light beam in past into square beam of light, can maximally utilise the clear field of Combined sheet amplifier, be conducive to improve system capacity conversion efficiency." multipass amplifying technique " refers to laser pulse Multiple through then out laser amplification medium in system, thereby more effectively improves the extraction efficiency of amplifier energy storage.Theoretical and experimental study result all shows for identical output flow, multi-pass amplifier and traditional main oscillations add boosting and amplify (Master Oscillator and Power Amplifier, MOPA) system is compared, can effectively reduce prime driving pulse energy, thereby reduce driving stage scale, reduce apparatus cost.At present, the multipass that device of high power laser adopts amplifies configuration and mainly contains two kinds:
(1). igniter (the National Ignition Facility of class country, NIF) quadruple pass amplifies configuration: U.S. Lao Lunsilifu mole of lab design the quadruple pass that is applied to NIF amplify configuration, see Americana " American National igniter laser activity state " (Appl. Opt., vol. 46, p. 3278,2007).Its basic characteristics are to utilize a pair of chamber mirror to form enlarged cavity to realize the quadruple pass of laser pulse and amplify, and the orthogonal polarizer of utilization and neodymium glass realizes internal system and isolate, and utilize heavy caliber electrooptical switching control laser polarization state to realize effective extraction of high energy pulse.
(2). class megajoule laser aid (Laser M é gajoules, LMJ) quadruple pass amplifies configuration: in France, Mel lab design the quadruple pass that is applied to LMJ amplify configuration, see document " Mir ó: the complete model and the software that amplify and transmit for calculating high power laser system pulse " (Opt. Eng., vol. 42, p. 1538,2003).Its basic characteristics are to utilize a heavy caliber chamber mirror and the small-bore Beam reverser of L-type (L-turn) (Beam Reverser, BR) to form multipass transmission cavity, and the quadruple pass of realizing laser pulse amplifies; And realize internal system isolation based on heavy caliber or small-bore electrooptical switching.
Analyze two kinds of configurations known: first, class LMJ configuration structurally can replace technical sophistication and the higher heavy caliber plasma electrode electrooptical switching of loss with small-bore electrooptical switching; Secondly, class LMJ configuration makes system have better gain characteristic, and for identical system output energy, the required injected pulse energy of class LMJ configuration is little approximately 10 times compared with class NIF configuration; Or keep input constant in energy, and can reduce the sheet number of main amplifying stage, these two kinds of selections can reduce system cost.Trace it to its cause and be, class LMJ configuration is to identical neodymium glass number, and its effective sheet number is greater than class NIF configuration.
On the basis of comprehensive analysis, comparing class NIF configuration and class LMJ configuration, in conjunction with physics requirement of experiment and domestic correlative study working foundation, the present invention proposes a kind of multifunctional light beam inversion device.After employing, can evade the use of heavy caliber electrooptical switching and polarizer; By the optimization of overall configuration, can reduce system loss simultaneously.
Summary of the invention
Isolation of system and the pulse output problem of amplifying for effectively solving device of high power laser quadruple pass, the invention provides a kind of multifunctional light beam inversion device.
Multifunctional light beam inversion device of the present invention, comprises speculum I and speculum II, lens III, electrooptical switching, speculum III, speculum IV, speculum V, lens IV, speculum VI and speculum VII; The laser beam that laser sends enters lens III by speculum I and speculum II and is converted into directional light, thereby makes the heavy caliber light beam in main putting be converted into medium caliber light beam, is convenient to transmit in multifunctional light beam inversion device; Collimated light beam is through playing conducting effect and to entering 90 ° of corner bodies of speculum III, speculum IV and transmitting mirror V composition after the electrooptical switching of self-oscillation and backward-reflected laser isolation to laser pulse; 90 ° of corner bodies near field and polarization state to collimated light beam carried out 90 ° of rotations; Then collimated light beam converges through lens IV, then derives through speculum VI and speculum VII successively.
Lens I in lens III in multifunctional light beam inversion device of the present invention and lens IV and main putting and spatial filter pinhole array composition two-stage spatial filter, play the effect of picture transmission and control device beam quality.
In multifunctional light beam inversion device of the present invention, organize speculum III, speculum IV and the transmitting mirror V of corner body in 90 ° and under off-line state, carry out precision adjustment, after adjusting, lock, overall attitude regulation is only carried out at scene; When assembling, need ensure that incident beam is parallel with outgoing beam.
Multifunctional light beam inversion device of the present invention has adopted " the U-shaped light path+corner of external body " structure, and the L-type Beam reverser adopting from French LMJ is obviously different, and its maximum feature is that light beam passes through after inversion device, by half-twist, to comprise plane of polarization.
Amplify in configuration at existing multipass, due to the restriction of disk amplifier fabricated structure, its transmitted light polarization direction of neodymium glass that is Brewster's angle installation is level, only allows the burst transmissions of horizontal polarization to amplify.In the present invention, light beam is half-twist after inversion device, means under static conditions, and when electrooptical switching is not worked, laser pulse its polarization state after inversion device that one, two journeys transmission are amplified becomes vertically, will deflect away from main optical path three, in quadruple pass transmission amplification.Owing to inserting Beam reverser, the polarization state of one, two Cheng Guanglu will be with three, quadruple pass is orthogonal, thereby play the effect of system-level isolation.Therefore, adopt laser aid after multifunctional light beam inversion device of the present invention to realize system-level main equivalence " mutually orthogonal " effect by one, two journeys and three, quadruple pass neodymium glass of isolation, and between NIF and LMJ system-level, the orthogonal of neodymium glass and heavy caliber polarizer mainly leaned in isolation.
In the present invention, the major function that in Beam reverser, plasma electrode electric light opens the light is the control of pulse polarization state, and the laser pulse half-twist that is about to one, two journey horizontal polarizations becomes vertical polarization; Be horizontal polarization through 90 ° of corner body revolutions again, realize the system-wide transmission of laser pulse and amplify.These characteristics had both met the basic demand of system-level isolation, simultaneously because pulse single transmission is by small-bore electrooptical switching and without polarizer, therefore significantly reduced the quiescent dissipation that inversion device is introduced, improve static system transmitance, improve the Energy Output of system.
Brief description of the drawings
Fig. 1 is the index path of the application examples of multifunctional light beam inversion device of the present invention;
Fig. 2 is the index path of multifunctional light beam inversion device of the present invention;
In figure: amplifier 106. chamber mirror 107. multifunctional light beam inversion device 108. lens II 109. boosting amplifier 110. spatial filter 111. target range 201. speculum I 202. speculum II 203. lens III 204. electrooptical switching 205. speculum III 206. speculum IV 207. speculum V 208. lens IV 209. speculum VI 210. speculum VII in 101. optical pulse generation system 102. prime amplifier 103. spatial filter pinhole array 104. lens I 105. chambeies.
Embodiment
Fig. 2 is the index path of multifunctional light beam inversion device of the present invention, as shown in Figure 2, multifunctional light beam inversion device of the present invention, comprises speculum I 201 and speculum II 202, lens III 203, electrooptical switching 204, speculum III 205, speculum IV 206, speculum V 207, lens IV 208, speculum VI 209 and speculum VII 210; The laser beam that laser sends enters lens III 203 by speculum I 201 and speculum II 202 and is converted into directional light, thereby makes the heavy caliber light beam in main putting be converted into medium caliber light beam, is convenient to transmit in multifunctional light beam inversion device; Collimated light beam is through playing conducting effect and to entering 90 ° of corner bodies that speculum III 205, speculum IV 206 and transmitting mirror V 207 form after the electrooptical switching 204 of self-oscillation and backward-reflected laser isolation to laser pulse; 90 ° of corner bodies near field and polarization state to collimated light beam carried out 90 ° of rotations; Then collimated light beam converges through lens IV 208, then derives through speculum VI 209 and speculum VII 210 successively.
Multifunctional light beam inversion device of the present invention has carried out experimental verification in SG-Ⅲ prototype, is further described below in conjunction with accompanying drawing and application examples.
Fig. 1 is the index path of the application examples of multifunctional light beam inversion device of the present invention, as shown in Figure 1, SG-Ⅲ prototype has adopted " in quadruple pass chamber, 90 ° of U-shaped Beam reverser+one way boostings of upset of the amplification+calibre-changeable are amplified " configuration based on multipass amplifying technique, system adopts U-shaped multifunctional light beam inversion device and from shaft type open loop light path, to avoid forming self-oscillation.Optical pulse generation system 101 produces receives burnt level precision truing laser pulse, after prime amplifier 102 amplifies, injects main place system.Laser pulse amplifies entering amplifier 105 in chamber through lens 104 behind 1 hole of spatial filter pinhole array 103.After returning, chamber mirror 106 enters multifunctional light beam inversion device 107 of the present invention through 2 holes of spatial filter pinhole array 103.Back light enters through 3 holes of spatial filter pinhole array 103 in chamber that amplifier 105 carries out three, quadruple pass amplifies, and enters boosting amplifier 109 afterwards amplify through 4 holes of spatial filter pinhole array 103 and lens 108.Through spatial filter 110, high-frequency noise is being carried out after filtering and picture transmit entering target range 111.
The Main Function of multifunctional light beam inversion device of the present invention in SG-Ⅲ prototype is:
1. make in the light beam return cavity after amplifier in chamber 105 1, two Cheng Fang great that amplifier 105 carries out three, quadruple pass amplifies;
2. the electrooptical switching 204 of multifunctional light beam inversion device 107 inside plays isolation of system effect, for suppressing chamber endoparasitism vibration and reverse laser;
3. the lens 203 at electrooptical switching 204 two ends and lens 208 form two-stage spatial filter with lens 104 and spatial filter pinhole array 103 in main putting, play the effect of picture transmission and control system beam quality;
4. the diagnosis that multifunctional light beam inversion device can be the second journey laser parameter provides sample beam;
5. multifunctional light beam inversion device can be automatic-aligning system sampling window and sample beam is provided, thereby realizes the autocollimation control of quadruple pass amplification light path.
By with the comparative analysis of domestic and international multi-pass amplifier Beam reverser, multifunctional light beam inversion device of the present invention mainly contains the characteristic of the following aspects:
1. the inter-stage isolation structure of " electrooptical switching+corner body+neodymium glass group "
Multiple neodymium glass horizontal polarization transmission features of utilizing Brewster angle to place, in conjunction with the beam reversal function of multifunctional light beam inversion device of the present invention, form the inter-stage isolation between one, two Cheng Fang great and three, quadruple pass amplification with " electrooptical switching+corner body+neodymium glass ", the static state isolation and the self-oscillation that have realized system suppress, and can tackle backward-reflected laser.Adopt multifunctional light beam inversion device of the present invention both effectively to evade and use the development great heavy caliber electrooptical switching of difficulty and heavy caliber polarizer, effectively reduce again system loss, improved system output characteristic.In the first bundle of SG-Ⅲ prototype bright dipping integrated experimentation, adopt after multifunctional light beam inversion device of the present invention, experiment test system static transmission is 57%; And adopt in the multipass amplification test system of L-type Beam reverser in early stage, because light beam passes through electrooptical switching for twice, static transmission is only 30% left and right.
2. the Laser beam quality control process of " calibre-changeable+90 degree upset "
Adopt multifunctional light beam inversion device of the present invention, the output beam quality that improves multi-pass amplifier is had to larger benefit.Face shape characteristic analysis to heavy caliber neodymium glass is known, and the wavefront distortion of sheet edge and four jiaos is serious, and central area face shape is better.Therefore, in quadruple pass amplification process, inject the lens parameter of lens and multifunctional light beam inversion device by adjustment, beam size when one, two journeys and three, quadruple pass are amplified increases step by step, can make light beam in amplification process can evade the wavefront distortion that optical elements of large caliber edge is larger, improve output beam quality.In addition, utilize the corner body of inversion device, by 90 ° of beam reversals, the wavefront that this design brings the distortion of disk amplifier heat has become " sphere ", namely out of focus from " cylinder ".And out of focus only changes focal position, it is the wavefront error that is easy to be corrected of can scioptics focusing.Beam rotation compensation process is analyzed and be can be described as:
(1)
(2)
(3)
Wherein (1) formula represents the heat distortion that light beam brings by neodymium glass four-range multiplication system one, two journeys, is mainly out of focus
and astigmatism
; To be converted into (2) formula by wavefront distortion after 90 ° of rotations; Light beam continuing by three, quadruple pass introduces again the represented wavefront distortion of (1) formula after amplifying, final output can be write as the stack of (1) formula and (2) formula, obtains (3) formula, stack result is
, system output wave front-distortion is mainly out of focus.Visible, light beam is passing through after " 90 degree upset ", and during quadruple pass amplifies, the hot astigmatism bringing that distorts of disk amplifier has obtained compensation, and transforms for out of focus.Adopt after multifunctional light beam inversion device of the present invention, the astigmatism with " tile " distribution of shapes transforms the out of focus for " sphere " distribution of shapes, after easily scioptics focusing compensates, can greatly weaken the impact of disk amplifier heat distortion on laser aid output fundamental frequency light far field encircled energy, thereby promote the far field quality of system output beam.
Claims (1)
1. a multifunctional light beam inversion device, is characterized in that: described multifunctional light beam inversion device comprises speculum I (201) and speculum II (202), lens III (203), electrooptical switching (204), speculum III (205), speculum IV (206), speculum V (207), lens IV (208), speculum VI (209) and speculum VII (210); The laser beam that laser sends enters lens III (203) by speculum I (201) and speculum II (202) and is converted into directional light, thereby makes the heavy caliber light beam in main putting be converted into medium caliber light beam, is convenient to transmit in multifunctional light beam inversion device; Collimated light beam is through playing conducting effect and to entering 90 ° of corner bodies that speculum III (205), speculum IV (206) and transmitting mirror V (207) form after the electrooptical switching (204) of self-oscillation and backward-reflected laser isolation to laser pulse; 90 ° of corner bodies near field and polarization state to collimated light beam carried out 90 ° of rotations; Then collimated light beam converges through lens IV (208), then derives through speculum VI (209) and speculum VII (210) successively.
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| CN201410464536.9A CN104184036A (en) | 2014-09-12 | 2014-09-12 | Multifunctional light beam reverser |
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| CN201410464536.9A CN104184036A (en) | 2014-09-12 | 2014-09-12 | Multifunctional light beam reverser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211476A (en) * | 2020-01-16 | 2020-05-29 | 中国工程物理研究院激光聚变研究中心 | Wavefront control method for four-pass amplifier |
| CN111948871A (en) * | 2020-08-18 | 2020-11-17 | 中国工程物理研究院激光聚变研究中心 | Multi-pass amplification system shared by pump light and signal light |
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| CN102157890A (en) * | 2011-03-21 | 2011-08-17 | 华中科技大学 | Polarization-insensitive space folding laser resonator |
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- 2014-09-12 CN CN201410464536.9A patent/CN104184036A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5596594A (en) * | 1994-01-20 | 1997-01-21 | Fanuc Ltd. | Laser oscillator |
| CN102157890A (en) * | 2011-03-21 | 2011-08-17 | 华中科技大学 | Polarization-insensitive space folding laser resonator |
Non-Patent Citations (4)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211476A (en) * | 2020-01-16 | 2020-05-29 | 中国工程物理研究院激光聚变研究中心 | Wavefront control method for four-pass amplifier |
| CN111211476B (en) * | 2020-01-16 | 2021-06-25 | 中国工程物理研究院激光聚变研究中心 | Wavefront control method for four-pass amplifier |
| CN111948871A (en) * | 2020-08-18 | 2020-11-17 | 中国工程物理研究院激光聚变研究中心 | Multi-pass amplification system shared by pump light and signal light |
| CN111948871B (en) * | 2020-08-18 | 2022-01-28 | 中国工程物理研究院激光聚变研究中心 | Multi-pass amplification system shared by pump light and signal light |
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