CN104019891B - For the decay sampler of large angle incidence superlaser - Google Patents
For the decay sampler of large angle incidence superlaser Download PDFInfo
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- CN104019891B CN104019891B CN201410279528.7A CN201410279528A CN104019891B CN 104019891 B CN104019891 B CN 104019891B CN 201410279528 A CN201410279528 A CN 201410279528A CN 104019891 B CN104019891 B CN 104019891B
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Abstract
The invention discloses a kind of decay sampler for large angle incidence superlaser, comprise front panel, attenuation units and rear panel, front panel is provided with the sampling straight hole of laser incidence, rear panel is provided with laser emitting hole, attenuation units comprise front transmission window, rear transmission window and and cylindrical cavity, cylindrical cavity is coaxially arranged with sampling straight hole, laser emitting hole, is filled with granular optical body scattering material in cylindrical cavity.Laser is coupled into attenuation units through thief hole, absorb through inwall and material and penetrated by laser emitting hole after volume scattering, can redistribute in the space of beam energy in a big way, and there is homogenize effect, realize wide-angle decay sampling during laser oblique incidence simultaneously, and the significantly decay of laser power density can be met, and can be used for the light intensity detection of high-space resolution.
Description
Technical field
The present invention relates to a kind of method that superlaser wide-angle is measured, especially a kind of device utilizing volume scattering material to carry out superlaser wide-angle decay sampling.
Background technology
In superlaser parameter measurement, photodetector array sampling method is often adopted to obtain laser spot power density spatial and temporal distributions information.Because the laser power density at test position place is general all higher, directly utilize photodetector array to carry out measurement and there is larger difficulty, therefore need to carry out reasonably decay with the range ability meeting photodetector to tested laser power density in reality test.
Far-field laser after propagation in atmosphere, usual incident photodetector array at a certain angle, due to the uncertainty of propagation in atmosphere and the diversity of superlaser use-pattern, therefore must ensure in larger ranges of incidence angles, photodetector can normally work simultaneously.
For ensureing that detector array has larger field angle, method conventional at present for carry out chamfering on metal detector front panel, form the taper hole with certain angle, increase the field angle of detector sampling passage, as the Chinese patent " a kind of high-energy laser semi-integrating-sphere array attenuator " (see Fig. 1) that application number is 201110231864.0, field angle becomes certain linear relationship with chamfer angle, is increased the sampling angle of whole sniffer by the angle increasing sampling plate surface chamfering.This processing mode Problems existing is the taper hole emptying a wide-angle on the front panel needing to bear Irradiation of High, especially for the detection of face battle array structure, mean that the quality of front panel reduces, the ability of heat absorption reduces, therefore weaken the resisting laser damage ability of front panel, detector array is easily damaged for during high power laser light energy measurement, and chamfer angle is larger, resisting laser damage ability is poorer, therefore laser intensity decay and parameter measurement when being difficult to use in oblique incidence.In addition, the existence of chamfering increases the distance between detector array, reduces detector array spatial resolution, limits the range of application of this method.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of wide-angle detection method of superlaser, can realize the wide-angle detection of superlaser power density, and have stronger resisting laser damage ability.
For solving the problems of the technologies described above, basic conception of the present invention is:
For the decay sampler of large angle incidence superlaser, comprise the front panel, attenuation units and the rear panel that set gradually along laser incident direction, front panel is provided with the sampling straight hole of laser incidence, rear panel is provided with laser emitting hole, attenuation units comprise front transmission window, rear transmission window and and cylindrical cavity, front transmission window is close to sampling straight hole and is arranged, rear transmission window is close to laser emitting hole and is arranged, cylindrical cavity is coaxially arranged with sampling straight hole, laser emitting hole, is filled with granular optical body scattering material in cylindrical cavity.
Above-mentioned in the decay sampler of large angle incidence superlaser, the material of front transmission window and rear transmission window is quartz, silicon or silit.
Above-mentioned in the decay sampler of large angle incidence superlaser, optical body scattering material is silica sand or glass microballoon.
Above-mentioned in the decay sampler of large angle incidence superlaser, the material of front panel and rear panel is graphite, aluminium or copper.
Above-mentioned in the decay sampler of large angle incidence superlaser, the side to light of front panel is diffuse surface.
The beneficial effect that the present invention has has:
1, the present invention decays in sampler, laser is coupled into attenuation units through thief hole, absorb through inwall and material and penetrated by laser emitting hole after volume scattering, can redistribute in the space of beam energy in a big way, and there is homogenize effect, ensure that sampling straight hole has good angular characteristics simultaneously, realize wide-angle decay sampling during laser oblique incidence, and the significantly decay of laser power density can be met; Sample simultaneously straight hole without the need to carrying out on a large scale on front panel, the emptying of wide-angle taper hole, thus improve the anti-laser irradiation ability of front panel, and can be used for the light intensity detection of high-space resolution.
2, the present invention decays in sampler, and thief hole place is provided with diffuse transmission optical window, makes the laser through optical window be coupled into subsequent cell again, and plays homogenization to light beam, further improves the incident angle characteristic of attenuator.
3, the front panel surface that the present invention decays in sampler adopts diffuse reflection process, improves surface reflectivity, prevents other components and parts in the superlaser damage light path of reflection simultaneously;
4, the present invention is at the fixing screw hole of the both sides Design Orientation of front and back panel, ensure that the installation accuracy of wide-angle thief hole and semi-integral ball cavity on two pieces of panels, finally ensure that the consistance of sampling unit attenuation coefficient.
Accompanying drawing explanation
Fig. 1 is existing patent " a kind of high-energy laser semi-integrating-sphere array attenuator " principle schematic.
Fig. 2 is that the present invention decays sampler cellular construction schematic diagram.
Fig. 3 is that the present invention decays sampler unit incident light scattering principle schematic diagram.
Fig. 4 is that the present invention decays sampler unit Proof-Of Principle experimental result.
Fig. 5 is that the present invention decays sampler array structure schematic diagram.
Wherein: 1-front panel; 2-rear panel; 3-front transmission window; 4-cylindrical cavity; 5-volume scattering material; 6-sampling straight hole; 7-laser emitting hole; 8-fixing screw hole; 9-rear transmission window.
Embodiment
As shown in Figure 2, decay sampler of the present invention, comprise the front panel 1 set gradually along laser incident direction, attenuation units and rear panel 2, front panel 1 is processed with sampling straight hole 6, rear panel 2 is provided with laser emitting hole 7, described attenuation units comprises front transmission window 3, rear transmission window 9 and with cylindrical cavity 4, described front transmission window 3 is close to sampling straight hole 6 and is arranged, rear transmission window 9 is close to laser emitting hole 7 and is arranged, described cylindrical cavity 4 and sampling straight hole 6, laser emitting hole 7 is coaxially arranged, granular optical body scattering material 5 is filled with in described cylindrical cavity 4.Front and back panel is respectively arranged with front transmission window 3 and rear transmission window 9, two pieces of panels are superimposed, make sampling attenuation units and laser emitting hole 7 form an entirety.
In application, laser is coupled into decay sampling unit along the direction of arrow in Fig. 3 from sampling straight hole 6, when in cylindrical cavity 4, nothing is filled, different incident ray reflects different number of times at inwall, and inwall can absorb the large energy with scattering, causes thief hole angular characteristics to be difficult to meet the demands.And after filling diffuse-reflective material, meet Lambert cosine law because scattered light intensity distributes in space, i.e. I (θ)=I
0cos (θ), can be redistributed in the space of beam energy in a big way by scattering, and there is homogenize effect, as shown in Figure 3, now the incident ray of different directions is after scatterer effect, disperse in space and continue to propagate, regardless of incident angle, capital is through inwall reflection repeatedly, effectively reduce the difference that the absorption disperse function of inwall to light field changes with angle, ensure that thief hole has good angular characteristics, realize wide-angle decay sampling during laser oblique incidence, and the significantly decay of laser power density can be met.
In Fig. 3, incident laser, through the multiple reflections of volume scattering material 5 and absorption, finally only has fraction light to penetrate from laser emitting hole 7, realizes the decay to light laser power density, only draw several initial light here and be explained.Diffuse transmission window is used for packaging body scattering material and carry out homogenize to incident beam, strengthens angular characteristics further.Due to the scattering properties of window diffuse transmission and obturator scattering material, make the attenuation coefficient change in the larger ranges of incidence angles of laser of whole attenuation units less, as shown in Figure 4, and can be revised by demarcation, make attenuation units can meet the laser oblique incidence within the scope of certain angle, thus realize its decay sampling and light intensity detection.Simultaneously owing to adopting sampling straight hole structure, avoid wide-angle taper hole emptying front panel, thus improve the anti-laser irradiation ability of front panel, and can be used for the light intensity detection of high-space resolution.
Front panel 1 and rear panel 2 material can be graphite, aluminium or copper, in order to increase the anti-laser irradiation ability of front panel 1, prevent other components and parts in the damage of the superlaser after mirror-reflection light path simultaneously, also diffuse reflection process has been carried out to the laser incidence surface of front panel 1; Volume scattering material 5 can be the irregular particle of silica sand, glass microballoon or other material; Transmission window 3,9 is selected and is made the high saturating material of the laser of this wavelength such as quartz, silicon or silit, diffuse transmission process is all carried out in former and later two faces of transmission window, no matter be that the laser of normal incidence or laser multi-angle after transmission window of oblique incidence are coupled into detection light path like this, because device combines the diffuse transmission effect of diffuse transmission optical window and the scattering properties of volume scattering material, can be implemented in the decay sampling in larger ranges of incidence angles.
As shown in Figure 5, large area panel is processed with many above-mentioned wide-angle decay sampling units, then can realize the light intensity detection to large-area laser bundle, in order to ensure the installation accuracy of wide-angle thief hole on two pieces of panels, at the fixing screw hole 8 of the both sides Design Orientation of panel, to guarantee the consistance of positional precision and sampling attenuation coefficient.
Claims (5)
1. the decay sampler for large angle incidence superlaser, it is characterized in that: comprise the front panel (1) set gradually along laser incident direction, attenuation units and rear panel (2), described front panel (1) is provided with the sampling straight hole (6) of laser incidence, rear panel (2) is provided with laser emitting hole (7), described attenuation units comprises front transmission window (3), rear transmission window (9) and cylindrical cavity (4), described front transmission window (3) is close to sampling straight hole (6) and is arranged, rear transmission window (9) is close to laser emitting hole (7) and is arranged, described cylindrical cavity (4) and sampling straight hole (6), laser emitting hole (7) is coaxially arranged, granular optical body scattering material (5) is filled with in described cylindrical cavity (4), described front transmission window (3) and rear transmission window (9) are diffuse transmission window.
2. the decay sampler for large angle incidence superlaser according to claim 1, is characterized in that: the material of described front transmission window (3) and rear transmission window (9) is quartz, silicon or silit.
3. the decay sampler for large angle incidence superlaser according to claim 1, is characterized in that: described optical body scattering material (5) is silica sand or glass microballoon.
4. the decay sampler for large angle incidence superlaser according to claim 1, is characterized in that: the material of described front panel (1) and rear panel (2) is graphite, aluminium or copper.
5. the decay sampler for large angle incidence superlaser according to claim 1, is characterized in that: the side to light of described front panel (1) is diffuse surface.
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| 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 |
| CN112539847B (en) * | 2020-11-04 | 2022-06-28 | 中国科学院上海光学精密机械研究所 | Large-caliber ultrashort pulse sampling device |
| CN113405779A (en) * | 2021-06-24 | 2021-09-17 | 中国科学院合肥物质科学研究院 | Strong light sampling device based on optical fiber sampling and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329350A (en) * | 1992-05-21 | 1994-07-12 | Photon, Inc. | Measuring laser beam parameters using non-distorting attenuation and multiple simultaneous samples |
| CN102706446A (en) * | 2012-05-18 | 2012-10-03 | 中国工程物理研究院应用电子学研究所 | Large-angle used sampling attenuation device of array detector |
| CN103644967A (en) * | 2013-11-29 | 2014-03-19 | 西北核技术研究所 | High-energy laser homogenizing cavity attenuator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| LU86927A1 (en) * | 1987-06-19 | 1988-07-14 | Europ Communities | CONTINUOUSLY VARIABLE LASER BEAM DAMPER |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329350A (en) * | 1992-05-21 | 1994-07-12 | Photon, Inc. | Measuring laser beam parameters using non-distorting attenuation and multiple simultaneous samples |
| CN102706446A (en) * | 2012-05-18 | 2012-10-03 | 中国工程物理研究院应用电子学研究所 | Large-angle used sampling attenuation device of array detector |
| CN103644967A (en) * | 2013-11-29 | 2014-03-19 | 西北核技术研究所 | High-energy laser homogenizing cavity attenuator |
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