CN103644967B - A kind of superlaser homogenize chamber attenuator - Google Patents
A kind of superlaser homogenize chamber attenuator Download PDFInfo
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- CN103644967B CN103644967B CN201310633652.4A CN201310633652A CN103644967B CN 103644967 B CN103644967 B CN 103644967B CN 201310633652 A CN201310633652 A CN 201310633652A CN 103644967 B CN103644967 B CN 103644967B
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Abstract
The invention discloses a kind of superlaser homogenize chamber attenuator, comprise front panel, aperture sampling plate, attenuating plate, output slab and some scatter attenuation unit, attenuation units comprises the wide-angle sampling taper hole be arranged on aperture sampling plate, be arranged on homogenize chamber on attenuating plate and light transmission passage, be arranged on homogenize chamber on output slab and Laser output hole; Wherein light transmission passage adopts circle symmetrical structure, makes the angular characteristics of attenuator have circular symmetry.Attenuator has Multilayer Structure, effectively can weaken the high temperature of superlaser Long-Duration Exposure front panel generation to the impact of follow-up measuring unit.In attenuator of the present invention, laser is exported by delivery outlet after homogenize repeatedly, achieves the significantly decay of laser power density, and has angular characteristics of preferably decaying.
Description
Technical field
The present invention relates to a kind of attenuator of High energy laser beam, especially a kind of array attenuator measured for High energy laser beam.
Background technology
In superlaser parameter measurement, need the light intensity spatial and temporal distributions obtaining laser, because the laser power density at test position place is general all higher, need rationally to decay, the photodetector array of face battle array could be become to detect with cloth.
Optical attenuator method conventional at present mainly contains optical filter damped method and integrating sphere damped method, namely before every detector, increases an optical attenuator, by the power attenuation of laser in the detectable range of detector.Because optical filter its attenuation coefficient when large multiple is decayed is difficult to accurate calibration, requires higher to the power meter demarcated, and when the incident angle of laser changes, attenuation coefficient is inconsistent, adds demarcation difficulty, therefore applies less in superlaser is measured.
Disclose a kind of graphite integrating sphere array that utilizes in China Engineering Physics Research Institute's master thesis in 2000 " theoretical analysis that strong fast target is measured and experiment " and realize the method that the large multiple of large area superlaser power density is decayed, its ultimate principle enters in an integrating sphere by laser beam through entrance aperture, again through perforation hole outgoing, wherein laser entrance aperture and perforation hole are distributed in the both sides of integrating sphere.Also a kind of high-energy laser semi-integrating-sphere array attenuator is reported in granted patent ZL201110231864.0, wide-angle sampling taper hole is adopted to realize laser attenuation in conjunction with the method for semi-integral ball, laser absorbs through semi-integral ball chamber and is penetrated by laser emitting hole after diffuse reflection, achieves the significantly decay of laser power density.The weak point of above-mentioned integrating sphere structural damping device is, because integrating sphere attenuator is unsymmetric structure, entrance aperture and perforation hole are positioned at integrating sphere both sides, when laser oblique incidence, only have and could realize wide-angle laser decay when attenuator and laser direction are in specific position angle, and the laser incident angle that can decay is limited; In addition in order to realize the light intensity attenuation of larger multiple, integrating sphere is difficult to accomplish less size, limits the application of array attenuator in high-space resolution laser beam parameter measuring.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of superlaser homogenize chamber attenuator of compact conformation, the large multiple decay of superlaser power density can be realized, and when laser is in certain incident angle range during oblique incidence, to the putting position of attenuator and angle insensitive.
Technical scheme of the present invention is as follows:
A kind of superlaser homogenize chamber attenuator, comprises the front panel, aperture sampling plate, attenuating plate and the output slab that set gradually along incident laser direction;
Front panel and aperture sampling plate are processed with wide-angle sampling taper hole, the openend of wide-angle sampling taper hole is arranged on front panel, and in face of laser incident direction, the tail end of wide-angle taper hole arranges the inside of aperture sampling plate, and communicate with the logical light straight hole that aperture sampling plate rear end is coaxially arranged;
The front end of attenuating plate is provided with homogenize chamber, is provided with light transmission passage between homogenize chamber and the rear end face of attenuating plate, and light transmission passage is parallel to the axis of wide-angle sampling taper hole, and with it for axis of symmetry is symmetrical in circle;
The front end of output slab is provided with homogenize chamber, is provided with delivery outlet between homogenize chamber and rear end face, and described delivery outlet and wide-angle sample taper hole and coaxially arrange; The cavity of to be inside surface be in homogenize chamber diffuse surface.
In the attenuator of above-mentioned superlaser homogenize chamber, the xsect of light transmission passage is the circular hole of some symmetry arrangement.
In the attenuator of above-mentioned superlaser homogenize chamber, the xsect of light transmission passage is the crescent hole of some symmetry arrangement.
In the attenuator of above-mentioned superlaser homogenize chamber, be also included in the diffuse transmission sheet inserted in the middle part of wide-angle sampling taper hole, diffuse transmission sheet and wide-angle sample the axes normal of taper hole.
In the attenuator of above-mentioned superlaser homogenize chamber, diffuse transmission sheet material is quartz, silicon or alundum (Al2O3).
In the attenuator of above-mentioned superlaser homogenize chamber, the rear end of output slab is provided with detector spacing hole, and delivery outlet is just to the photosurface of detector.
In the attenuator of above-mentioned superlaser homogenize chamber, in homogenize chamber, be provided with diffuse transmission sheet.
In the attenuator of above-mentioned superlaser homogenize chamber, diffuse transmission sheet material is quartz, silicon or alundum (Al2O3).
In the attenuator of above-mentioned superlaser homogenize chamber, the material of front panel, aperture sampling plate, attenuating plate and output slab is graphite, aluminium, copper or copper aluminum composite material.
In the attenuator of above-mentioned superlaser homogenize chamber, the side to light of front panel is diffuse surface or mirror reflection surface.
The beneficial effect that the present invention has has:
1, in attenuator of the present invention, laser is coupled into composite design homogenize chamber and light hole through wide-angle sampling taper hole, make light beam output detector after diffuse reflection repeatedly and scattering, therefore the light intensity attenuation of large multiple can be realized, in homogenize chamber, add diffuse transmission sheet simultaneously, to the further homogenize of light beam, and improve the angle incidence characteristic of attenuator.
2, in attenuator of the present invention, in the middle part of wide-angle sampling taper hole, diffuse transmission optical window is provided with, can effective homogenize incident laser, improve the angular characteristics of attenuator.
3, in attenuator of the present invention, each unit adopts symmetrical structure design, can make attenuator to the direction of laser oblique incidence and putting position insensitive, reduce request for utilization, only need the different incidence angles at demarcation direction place and the relation of attenuation coefficient simultaneously, just can apply all incident directions, effectively reduce the demarcation difficulty of attenuator.
4, attenuator of the present invention adopts sandwich construction lamination to make, and has larger thermal contact resistance between each layer, during laser irradiation, effectively can reduce the heat affecting of front panel temperature rise to measuring system below.
5, attenuator of the present invention is by changing the parameter of differential declines unit, effectively regulates attenuation coefficient, meets different testing requirements.
Accompanying drawing explanation
Fig. 1 is homogenize chamber of the present invention attenuator unit structural representation;
Fig. 2 is light transmission passage structural representation on attenuation of the first kind plate of the present invention (the A-A section in Fig. 1);
Fig. 3 is light transmission passage structural representation on attenuation of the second kind plate of the present invention (the A-A section in Fig. 1);
Fig. 4 is light transmission passage structural representation on the third attenuating plate of the present invention (the A-A section in Fig. 1);
Fig. 5 is that attenuator attenuates coefficient of the present invention is with angle variation characteristic curve.
Fig. 6 is the schematic diagram that attenuator cloth of the present invention becomes array structure;
Reference numeral is as follows: 1-front panel; 2-diffuse transmission sheet; 3-aperture sampling plate; 4,6-homogenize chamber; 5-attenuating plate; 7-output slab; 8-logical light straight hole; 9-wide-angle sampling taper hole; 10-light transmission passage; 11-delivery outlet; 12-detector spacing hole.
Embodiment
As shown in Figure 1, superlaser homogenize chamber attenuator comprises the front panel 1, aperture sampling plate 3, attenuating plate 5 and the output slab 7 that set gradually along incident laser direction.Front panel 1 and aperture sampling plate 3 lamination after, it is processed with wide-angle sampling taper hole 9, the openend of wide-angle sampling taper hole 9 is arranged on front panel 2, and in face of laser incident direction, tail end arranges the inside of aperture sampling plate 3, and communicates with the logical light straight hole 8 that aperture sampling plate 3 rear end is coaxially arranged; The front end of attenuating plate 5 arranges homogenize chamber 4, and cavity thickness is about 1mm, and diameter is about 5mm, is processed as diffuse surface in the cavity in homogenize chamber; Be provided with light transmission passage 10 between homogenize chamber 4 and the rear end face of attenuating plate, described light transmission passage 10 is parallel to the axis of wide-angle sampling taper hole 9, and with it for axis of symmetry is symmetrical in circle; The front end of output slab 7 is provided with homogenize chamber 6, is provided with delivery outlet 11 between homogenize chamber 6 and rear end face, and described delivery outlet 11 samples taper hole 9 with wide-angle and coaxially arranges.In order to ensure the consistent shape of attenuator and reliability, can in each deck panels Design Orientation pin, its relative position is fixed, keep parameter constant.
The principle of work of superlaser homogenize chamber attenuator is, homogenize chamber 6 and delivery outlet 11 on the homogenize chamber 4 of input laser successively on wide-angle sampling taper hole 9, logical light straight hole 8, attenuating plate 5, output board, finally be coupled on detector, because laser is through diffuse reflection repeatedly in two homogenize chambeies 4,6, diffuse transmission and after absorbing, fraction light is finally only had to export through delivery outlet 11, finally realize the large multiple decay of light laser, and by different designs collocation, meet the attenuation requirement of different multiples.
In order to improve the incident angle characteristic of attenuator further, in the middle part of wide-angle sampling taper hole 9, being provided with diffuse transmission optical device 2, making laser through diffuse transmission device 2 to multiple directions scattering, weakening the space directivity of incident laser; Place diffuse transmission optical device 2 in homogenize chamber 4,6 simultaneously, repeatedly diffuse transmission is carried out to the laser of cavity wall reflection, plays homogenize laser action.Diffuse transmission device 2 is selected and is made high saturating material such as pure quartz, the alundum (Al2O3) etc. of measurement wavelength laser, and diffuse transmission optical device 2 all surface all carries out wharf's pavement quality, all can realize diffuse scattering to the laser of all processes.This mode effectively can improve the incident angle characteristic of attenuator, that is when the axis normal incidence that incident laser is no longer along wide-angle sampling taper hole, but when there is certain angle with axis, the attenuation coefficient of attenuator can remain unchanged or change less in a larger scope, thus within the scope of wide-angle variations, still can keep basically identical attenuation coefficient, for the decay of different attitude laser power.
As shown in Fig. 2-4, attenuating plate 5 is processed with round symmetric figure light transmission passage 10, light transmission passage 10 can have multiple version, such as circumference array round straight hole, symmetrical crescent hole or other draw together other shapes, owing to adopting the symmetrical light transmission passage design of circle, the attenuation characteristic of attenuator is made also to have circular symmetry, namely when incident laser is incident with inclination angle, regardless of the initial position of attenuator and laser, only need the different incidence angles at demarcation direction place and the relation of attenuation coefficient, just can apply all incident directions, effectively reduce the demarcation difficulty of attenuator, add the design freedom in attenuator application.
In addition in order to be applied to the Long-Duration Exposure of high energy and high power laser light, increase the anti-laser irradiation ability of front panel 1, mirror-reflection process or high diffuse reflection process have been carried out to the laser incidence surface of front panel 1, adopt the mode that this plurality of plates superposes simultaneously, between each layer, there is larger thermal contact resistance, during laser irradiation, effectively can reduce the heat affecting of front panel temperature rise to measuring system below.
Above-mentioned homogenize chamber attenuator is succeeded application in superlaser power density spatial and temporal distributions measurement mechanism, Fig. 5 is that this attenuator attenuates coefficient is with angle variation characteristic curve, can find out, be within the scope of 40 ° in oblique incidence angle, its attenuation coefficient amplitude of variation is little, prove when incident laser carries out angle change within the scope of this, its power all can effectively be decayed, and because attenuator is for justifying symmetrical structure, therefore other positions can be extended to after the attenuation coefficient incident angle characteristic of some positions is demarcated.
Fig. 6 gives array attenuator measures target spot instrument structural representation for light laser, a target spot instrument panel is evenly equipped with attenuator and the sensor of some arrays, attenuator adopts duralumin 7075 material to make, and may be used for the measurement of the High energy laser beam distribution parameter of different wave length by changing different types of detector.Attenuator due to this structure has compact conformation, breadth wise dimension is little, angular range is wide and insensitive to position, can realize the laser parameter measurement of high spatial resolution.
Claims (10)
1. a superlaser homogenize chamber attenuator, is characterized in that: comprise the front panel (1), aperture sampling plate (3), attenuating plate (5) and the output slab (7) that set gradually along incident laser direction;
Described front panel (1) and aperture sampling plate (3) are processed with wide-angle sampling taper hole (9), the openend of described wide-angle sampling taper hole (9) is arranged on front panel (1), and in face of laser incident direction, the tail end of wide-angle taper hole (9) arranges the inside of aperture sampling plate (3), and communicates with the logical light straight hole (8) that aperture sampling plate (3) rear end is coaxially arranged;
The front end of described attenuating plate (5) is provided with the first homogenize chamber (4), light transmission passage (10) is provided with between the first described homogenize chamber (4) and the rear end face of attenuating plate, described light transmission passage (10) is parallel to the axis of wide-angle sampling taper hole (9), and with it for axis of symmetry is symmetrical in circle;
The front end of described output slab (7) is provided with the second homogenize chamber (6), be provided with delivery outlet (11) between second homogenize chamber (6) and rear end face, described delivery outlet (11) and wide-angle sample taper hole (9) and coaxially arrange;
The first described homogenize chamber (4) and the second homogenize chamber (6) for inside surface be the cavity of diffuse surface.
2. superlaser homogenize chamber according to claim 1 attenuator, is characterized in that: the xsect of described light transmission passage (10) is the circular hole of some symmetry arrangement.
3. superlaser homogenize chamber according to claim 1 attenuator, is characterized in that: the xsect of described light transmission passage (10) is the crescent hole of some symmetry arrangement.
4. according to one of any described superlaser homogenize chamber attenuator of claim 1-3, it is characterized in that: be also included in the diffuse transmission sheet (2) that wide-angle sampling taper hole (9) middle part is inserted, described diffuse transmission sheet (2) and wide-angle sample the axes normal of taper hole (9).
5. superlaser homogenize chamber according to claim 4 attenuator, is characterized in that: described diffuse transmission sheet (2) material is quartz, silicon or alundum (Al2O3).
6. according to one of any described superlaser homogenize chamber attenuator of claim 1-3, it is characterized in that: the rear end of described output slab (7) is provided with detector spacing hole (12), described delivery outlet (11) is just to the photosurface of detector.
7., according to one of any described superlaser homogenize chamber attenuator of claim 1-3, it is characterized in that: in the first described homogenize chamber (4) and the second homogenize chamber (6), be provided with diffuse transmission sheet.
8. superlaser homogenize chamber according to claim 7 attenuator, is characterized in that: described diffuse transmission sheet material is quartz, silicon or alundum (Al2O3).
9., according to one of any described superlaser homogenize chamber attenuator of claim 1-3, it is characterized in that: the material of described front panel (1), aperture sampling plate (3), attenuating plate (5) and output slab (7) is graphite, aluminium, copper or copper aluminum composite material.
10., according to one of any described superlaser homogenize chamber attenuator of claim 1-3, it is characterized in that: the side to light of described front panel (1) is diffuse surface or mirror reflection surface.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019891B (en) * | 2014-06-20 | 2016-04-06 | 西北核技术研究所 | For the decay sampler of large angle incidence superlaser |
| CN104133302B (en) * | 2014-07-24 | 2016-10-05 | 中国工程物理研究院应用电子学研究所 | A kind of light laser sampling attenuator |
| CN104655408A (en) * | 2015-01-29 | 2015-05-27 | 大族激光科技产业集团股份有限公司 | Laser power monitoring device |
| CN106768310B (en) * | 2017-01-22 | 2018-04-10 | 中国工程物理研究院应用电子学研究所 | A kind of superlaser detector array sampling attenuating device |
| CN109579984B (en) * | 2018-12-27 | 2021-04-02 | 西北核技术研究所 | Laser beam homogenization attenuator |
| CN109579983B (en) * | 2018-12-27 | 2021-04-02 | 西北核技术研究所 | Light beam sampler for measuring light intensity distribution parameter of high-energy laser |
| CN113295274B (en) * | 2021-05-11 | 2022-12-16 | 中国科学院合肥物质科学研究院 | Detector array target sampling attenuation device for laser distribution measurement |
| CN114674425A (en) * | 2022-03-25 | 2022-06-28 | 西北核技术研究所 | Cascade attenuation structure based on light pipe sampling, installation method and detection array |
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Patent Citations (4)
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| GB1426096A (en) * | 1972-06-01 | 1976-02-25 | Sperry Rand Corp | Method of and apparatus for measuring the extinction coefficient of an atmospheric scatterin medium |
| JP2008218601A (en) * | 2007-03-02 | 2008-09-18 | Sumitomo Heavy Ind Ltd | Beam irradiation apparatus and method |
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