CN103389157B - High-energy laser beam expanding and absorbing device - Google Patents
High-energy laser beam expanding and absorbing device Download PDFInfo
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- CN103389157B CN103389157B CN201310320917.5A CN201310320917A CN103389157B CN 103389157 B CN103389157 B CN 103389157B CN 201310320917 A CN201310320917 A CN 201310320917A CN 103389157 B CN103389157 B CN 103389157B
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Abstract
The invention discloses a high-energy laser beam expanding and absorbing device which comprises a laser beam expanding cone, an energy absorption cavity, a front panel and a fixing plate, wherein the energy absorption cavity adopts a hollow cylinder; the front panel is arranged at a laser incident end of the energy absorption cavity, and the fixing plate is arranged at the rear end of the energy absorption cavity and used for fixing the laser beam expanding cone; and the laser beam expanding cone comprises a pointed beam expanding cone, at least two spherical beam expanding cones and cylinder transition sections which are arranged in the laser incident direction sequentially, and radii of cylinders of the cylinder transition sections are increased gradually in the laser incident direction. The laser beam expanding cone simultaneously realizes beam expanding of incident laser beams in the length direction and the circumference direction of the absorption cavity, and effectively reduces the power density of laser shot to a heat absorption cylinder by the laser beam expanding cone; and by means of the high-energy laser beam expanding and absorbing device, absorption and conduction of hundred thousand joules to a megajoule of high-power laser energy of continuous waves are realized, the measuring accuracy of an energy meter is improved greatly, and the device has wide applicability.
Description
Technical field
The present invention relates to a kind of energy measurement of high energy laser for Laser calorimeter and absorb cavity, what particularly relate to a kind of superlaser expands absorption plant.
Background technology
High-energy laser refers to that average power is greater than myriawatt, several seconds duration, exports the laser instrument of energy more than tens thousand of joule, has important industry and Military Application prospect.The output energy of high-energy laser is the important parameter characterizing laser capability, usually adopts calorimetry to carry out absolute measurement to the gross energy that high-energy laser exports.Its principle is that after incident laser energy is absorbed by absorber, luminous energy is converted to heat energy, calculates the gross energy of incident laser by measuring absorber temperature rise.
Superlaser facula area is large, go out luminous energy and power density is very high, has certain destructiveness, bring very large difficulty to energy absolute measurement to measurement mechanism.The absolute measurement of gross energy is exported for realizing superlaser, domestic Duo Jia unit have developed hypersorption formula measurement of laser energy device, wherein laser beam expanding absorption piece is the critical component in energy measuring apparatus, in October, 2008 No. 200810231820, invention disclosed patent, disclose a kind of laser reflection expanding cone and manufacture method thereof, it comprises at least two hollow conical surface reflecting segments and at least one the hollow cylindrical conical surface linkage section for connecting two adjacent conical reflecting sections, the pyramid type conical reflecting section that the incident direction that conical reflecting section is included in laser beam incident bundle sets gradually and at least one circular platform type conical reflecting section, the conical surface of each conical reflecting section is all equal with the angle of the incident direction of laser beam incident bundle, the outside surface of conical reflecting section is coated with high-reflecting film, this invention addresses existing laser reflection and expand processing difficulties, poor reliability, the technical matters of poor expandability, but the laser reflection face of this device is non-cambered surface, incident laser is not launched at cavity length direction, and not in conjunction with energy absorption cavity design, form one and complete expand absorption plant.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Continuous high-energy laser energy and expands absorption plant, reduce the laser power density arriving thermal absorption unit as far as possible, and guarantee to improve further under the prerequisite to laser energy safety and uniform pickup to measure range.
Technical solution of the present invention is:
A kind of superlaser expands absorption plant, comprise laser beam expanding cone, energy absorption chamber, front panel and fixed head, wherein energy absorption chamber is hollow cylinder, and front panel is arranged on the laser incidence end in energy absorption chamber, centre has laser entrance aperture, and laser entrance aperture is just to expanding cone; Fixed head is arranged on the rear end in energy absorption chamber, for fixed laser expanding cone;
Laser beam expanding cone comprise of setting gradually along laser incident direction expand pointed cone, at least two expand ball cone and cylinder transition section, and increase step by step along the circular cylinder radius of the cylinder transition sections at different levels of laser incident direction; Expand pointed cone and expand ball cone and be hollow-core construction, laser beam expanding poppet surface is coated with highly reflecting films.
Above-mentioned superlaser expands in absorption plant, and the cylinder inwall in energy absorption chamber is processed with energy absorption groove, energy absorption rooved face through chemical treatment to improve laser energy absorption rate.
Above-mentioned superlaser expands in absorption plant, and the radius-of-curvature expanding ball cone at different levels along laser incident direction increase step by step.
Above-mentioned superlaser expands in absorption plant, and laser beam expanding cone is for split-type structural, and realize adjacently expanding pointed cone and expanding the connection between ball cone by the screw thread that arranges in cylinder transition section and seal groove, seal groove is provided with zero RunddichtringO.
Above-mentioned superlaser expands in absorption plant, and in the cavity of laser beam expanding cone and the periphery in energy absorption chamber has cooling liquid to flow through.
Above-mentioned superlaser expands in absorption plant, and front panel is coated with high reverse--bias silverskin towards the surface in energy absorption chamber.
Above-mentioned superlaser expands in absorption plant, and fixed head cylinder has serrate energy absorption groove towards the surface working in energy absorption chamber, energy absorption rooved face through chemical treatment to improve laser energy absorption rate.
Above-mentioned superlaser expands in absorption plant, and the material of laser beam expanding cone is copper or aluminium.
Above-mentioned superlaser expands in absorption plant, and the material in energy absorption chamber is copper, aluminium or graphite.
Above-mentioned superlaser expands in absorption plant, and the surface of laser beam expanding cone is coated with golden film.
The present invention has following beneficial effect:
1, present invention achieves absorption and the conduction of 100,000 joules ~ megajoule level continuous wave height energy laser energy, substantially increase the measuring accuracy of energy meter, and there is applicability widely.
2, laser beam expanding of the present invention cone comprise expand pointed cone and transition layer by layer expand ball cone, laser beam expanding cone is coated with highly reflecting films, reduce the power density being incident to laser beam expanding poppet surface on the one hand, achieve incoming laser beam in the length of absorbing cavity and expanding of circumference both direction simultaneously, effectively reduce the laser power density being incident to thermal absorption cylindrical shell through laser beam expanding cone.
3, laser beam expanding cone of the present invention adopts split-type structural, and facilitate the processing of centrum, conical surface is coated with reflectance coating simultaneously, improves the ability of tolerance laser irradiation.
4, front panel surface of the present invention is coated with high reverse--bias silverskin, can again reflex to energy absorption chamber and fixed head absorption, improve laser absorption rate, thus enhance energy measurement precision parasitic light in energy absorption chamber.
5, the surface working of energy absorption chamber of the present invention and fixed head has energy absorption groove, and energy absorption rooved face further increases laser energy absorption rate through chemical treatment.
Accompanying drawing explanation
Accompanying drawing 1 is laser beam expanding absorption plant structural representation of the present invention;
Accompanying drawing 2 is the structural representation of energy absorption groove in energy absorption chamber of the present invention;
Accompanying drawing 3 expands the structural representation of pointed cone for the present invention;
Accompanying drawing 4 for the first order of the present invention expand ball cone structural representation;
Accompanying drawing 5 for the second level of the present invention expand ball cone structural representation.
1-laser beam expanding is bored; 2-energy absorption chamber; 3-fixed head; 4-front panel; 5-energy absorption groove; 6-incoming laser beam; 7-laser entrance port; 8-reflection lasering beam; 9-cylinder transition section; 10-expand pointed cone; 11-first order expands ball cone; 12-second level expands ball cone.
Embodiment
Conventional High Energy Laser Energy Meter is based on hypersorption measuring principle, when arriving the photothermal measurement unit such as absorbing cavity when incident superlaser, photothermal measurement unit absorbs incident laser energy and transforms self temperature rise, array of temperature sensor is utilized to measure in real time the change of photothermal measurement cell temperature, finally by data acquisition process unit, the temperature signal that array of temperature sensor measurement obtains is recorded and processed, finally obtain the gross energy of incident superlaser.
When being applied to high power, going out photo measure for a long time, the tolerance laser irradiation ability of energy absorbing device is very crucial, the present invention proposes a kind of energy measurement of high energy laser be applied in energy measurement of high energy laser measurement mechanism and expand absorption plant, comprise laser beam expanding cone 1, energy absorption chamber 2, front panel 4 and fixed head 3.
Front panel 4 is arranged on the laser incidence end in energy absorption chamber 2, and centre has just to the laser entrance aperture 7 of expanding cone 1; Fixed head 3 is arranged on the rear end in energy absorption chamber, and laser beam expanding cone 1 is fixed on fixed head 3, and fixed head 3 is carved with seal groove, is provided with zero RunddichtringO in seal groove, in fastening middle generation deformation, makes to expand cone and fixed head is tightly connected.
Laser beam expanding cone 1 comprises of setting gradually along laser incident direction and expands pointed cone 10, at least two and expand ball cone 11,12 and cylinder transition section 9, and increases step by step along the circular cylinder radius of the cylinder transition sections 9 at different levels of laser incident direction; Expand pointed cone 10 and expand ball cone 11,12 and be hollow-core construction, whole laser beam expanding is bored 1 surface and is coated with highly reflecting films.When laser is incident from laser entrance aperture 7, expand length that cone makes laser in energy absorption chamber and circumferencial direction launch after irradiation on the wall of energy absorption chamber, reach the object of Attenuated laser power density.
Energy absorption chamber 2 is hollow cylinder, effectively can absorb the laser of irradiation on it, and the heat of deposition is transmitted outside the wall of chamber, front panel makes scattering that it fully be absorbed by energy absorption chamber 2 and fixed head 3 etc. in laser return cavity, energy absorption chamber 2 adopts copper, aluminium or graphite to make, the cylinder inwall in energy absorption chamber 2 is processed with energy absorption groove 5, to increase laser energy absorption rate, energy absorption groove 5 is serrate, surface is through chemical treatments such as blackouts to improve laser energy absorption rate, and its structure as shown in Figure 2.
Laser beam expanding cone 1 is the critical component of this device, use oxygen-free copper makes, according to testing requirement, simultaneously for convenience of machining and installation, expand cone to be made up of multistage, expand the cone first order and be transitioned into sphere by pinnacle, expanding cone subsequent stages is the spherical surface body gradually increased, the structural representation that Fig. 3 to Fig. 5 gives and expands pointed cone 10, the first order expands ball cone 11, the second level expands ball cone 12.Connecting thread, sealed groove and zero RunddichtringO compact siro spinning technology is utilized, the current of salable certain pressure between at different levels.Expand the surface of cone, particularly pinnacle and land portions, after polishing, use vapour deposition method to be coated with high reverse--bias gold film, to the reflectivity of incident laser higher than 95%, the 12kW/cm of resistance to laser-damaged threshold value
2above.
Further, as a kind of optimal way, fixed head 3 uses duralumin to make, be designed with energy absorption groove 5 towards the one side in chamber, absorption cell is zigzag structure, and its shape is consistent with Fig. 2, the surperficial melanism of fixed head 3, Absorbable rod scattered beam while fixed laser Reflecting pyramid; Front panel 4 adopts duralumin to make, and towards the mirror polish in chamber, surface is coated with high reverse--bias silverskin, can return in chamber by the laser reflection of scattering on it, laser energy is fully absorbed, to improve measuring accuracy.
The present invention is not limited to above-mentioned embodiment, and such as different hot spot, cavity and laser beam expanding cone shape, large I make suitable change; Expanding cone also can be that otherwise close-connected at least two-stage expands sphere, and make material and can select oxygen-free copper, import brass or rafifinal, surperficial high reflecting metal rete can take evaporation coating method or chemical method to be coated with golden film or silverskin; The object of design energy absorption cell 5 increases S. E. A., and grooved can have different angle changes; More than change is all in protection scope of the present invention.
Claims (10)
1. a superlaser expands absorption plant, comprise laser beam expanding cone (1), energy absorption chamber (2), front panel (4) and fixed head (3), it is characterized in that: described energy absorption chamber (2) is hollow cylinder, described front panel (4) is arranged on the laser incidence end in energy absorption chamber (2), centre has laser entrance aperture (7), and described laser entrance aperture is just to expanding cone (1); Described fixed head (3) is arranged on the rear end in energy absorption chamber, for fixed laser expanding cone (1);
Described laser beam expanding cone (1) comprise of setting gradually along laser incident direction expand pointed cone (10), at least two expand ball cone (11,12) and at least two respectively with respectively expand ball and bore (11,12) corresponding cylinder transition section (9), and to increase step by step along the circular cylinder radius of the cylinder transition sections (9) at different levels of laser incident direction; Described expanding pointed cone (10) and expand ball cone (11,12) is hollow-core construction, and described laser beam expanding cone (1) surface is coated with highly reflecting films.
2. superlaser according to claim 1 expands absorption plant, it is characterized in that: the cylinder inwall of described energy absorption chamber (2) is processed with zigzag energy absorption groove (5), described energy absorption groove (5) surface through chemical treatment to improve laser energy absorption rate.
3. superlaser according to claim 1 expands absorption plant, it is characterized in that: the described radius-of-curvature expanding ball cone (11) at different levels along laser incident direction increase step by step.
4. superlaser according to claim 1 expands absorption plant, it is characterized in that: described laser beam expanding cone (1) is split-type structural, realize adjacently expanding pointed cone (10) and expanding the connection between ball cone (11,12) by the screw thread that arranges in cylinder transition section and seal groove, described seal groove is provided with O RunddichtringO.
5. superlaser according to claim 1 expands absorption plant, it is characterized in that: in the cavity of described laser beam expanding cone (1) and the periphery of energy absorption chamber (2) has cooling liquid to flow through.
6. superlaser according to claim 1 expands absorption plant, it is characterized in that: described front panel (4) is coated with high reverse--bias silverskin towards the surface of energy absorption chamber (2).
7. superlaser according to claim 1 expands absorption plant, it is characterized in that: described fixed head (3) and cylinder have zigzag energy absorption groove (5) towards the surface working of energy absorption chamber (2), described energy absorption groove (5) surface through chemical treatment to improve laser energy absorption rate.
8. superlaser according to claim 1 expands absorption plant, it is characterized in that: the material of described laser beam expanding cone (1) is copper or aluminium.
9. superlaser according to claim 1 expands absorption plant, it is characterized in that: the material in described energy absorption chamber (2) is copper, aluminium or graphite.
10. superlaser according to claim 1 expands absorption plant, it is characterized in that: the surface of described laser beam expanding cone (1) is coated with golden film.
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| CN201310320917.5A CN103389157B (en) | 2013-07-26 | 2013-07-26 | High-energy laser beam expanding and absorbing device |
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| CN201310320917.5A CN103389157B (en) | 2013-07-26 | 2013-07-26 | High-energy laser beam expanding and absorbing device |
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| CN103389157B true CN103389157B (en) | 2015-05-20 |
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Cited By (1)
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| CN108957767A (en) * | 2018-07-16 | 2018-12-07 | 湖北三江航天红林探控有限公司 | High power light energy choking device |
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| CN104048755B (en) * | 2014-05-21 | 2015-11-18 | 西北核技术研究所 | A kind of hypersorption High Energy Laser Energy Meter |
| CN104133295A (en) * | 2014-08-20 | 2014-11-05 | 南京中科神光科技有限公司 | Laser beam absorption device |
| CN104165690B (en) * | 2014-09-04 | 2016-01-20 | 中国工程物理研究院应用电子学研究所 | A kind of High Energy Laser Energy Meter calibrating installation |
| DE102016009475B4 (en) | 2016-08-05 | 2019-06-19 | Primes GmbH Meßtechnik für die Produktion mit Laserstrahlung | Beam power measurement with expansion |
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| CN111637967B (en) * | 2020-04-30 | 2023-03-28 | 中国工程物理研究院应用电子学研究所 | Universal solid absorption type high-energy laser energy measuring probe |
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| CN114235349A (en) * | 2021-12-07 | 2022-03-25 | 中国科学院合肥物质科学研究院 | Composite absorber structure of full-absorption high-energy laser energy meter |
| CN114566860A (en) * | 2022-04-28 | 2022-05-31 | 中国工程物理研究院应用电子学研究所 | Laser absorption device and laser |
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| CN108957767A (en) * | 2018-07-16 | 2018-12-07 | 湖北三江航天红林探控有限公司 | High power light energy choking device |
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