High-energy laser beam expanding and absorbing device

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 [0001] The invention relates to a high-energy laser energy absorption cavity used for a laser calorimeter, in particular to a high-energy laser beam expansion absorption device. Background technique [0002] High-energy lasers refer to lasers with an average power greater than 10,000 watts, a duration of several seconds, and an output energy of more than tens of thousands of joules. They have important industrial and military application prospects. The output energy of a high-energy laser is an important parameter to characterize the laser efficacy, and the total energy output by a high-energy laser is usually measured absolutely by calorimetry. The principle is that after the incident laser energy is absorbed by the absorber, the light energy is converted into heat energy, and the total energy of the incident laser is calculated by measuring the rise of the absorber body temperature. [0003] The high-energy laser has a large spot area, very high light ener...

AI Technical Summary

Problems solved by technology

[0003] The high-energy laser has a large spot area, and the output energy and power density are very high, which is destructive to the measurement device and brings great difficulties to the absolute measurement of energy.

In order to realize the absolute measurement of the total output energy of the high-energy laser, many domestic units have developed a full-absorption laser energy measurement device, in which the laser beam expansion absorption part is the key component of the energy measurement device, and the invention patent No. 200810231820 was published in October 2008 , discloses a laser reflective beam expander cone and a manufacturing method thereof, which includes at least two hollow conical reflective sections and at least one hollow cylindrical conical connecting section for connecting two adjacent conical reflective sections, The conical reflective section includes a conical conical reflective section and at least one conical conical reflective section arranged in sequence in the incident direction of the laser incident beam. The angles are all equal, and the outer surface of the conical reflection section is coated with a high-reflection film. This invention solves the technical problems of existing laser reflection beam expansion processing difficulties, poor reliability, and poor scalability, but the laser reflection surface of this device is non-arc. On the surface, the incident laser light is not expanded in the cavity length direction, and the energy absorption cavity design is not combined to form a complete beam expansion absorption device

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