A Total Absorption High Energy Laser Energy Meter

Abstract

The invention disclose a total absorption superlaser energy meter which comprises a reflection cone and an absorption cavity, wherein the generatrix of the reflection cone is arc-shaped, the absorption cavity is formed by sealed connection of a base plate, an inner lateral plate, an absorption cylinder and a cover plate, the whole structure of the absorption cavity is concave, the wall of the absorption cylinder is arranged on the light path of a superlaser beam after the superlaser beam is reflected through the reflection cone, and the absorption cylinder is located behind the reflection cone in the front and back direction. According to the total absorption superlaser energy meter, the incident collimated light beam is reflected onto the wall of the absorption cylinder in an axial and circumferential two-dimensional beam expansion mode, the power density of laser irradiating on the wall of the absorption cylinder is reduced greatly, the light receiving area of the reflection cone is increased at the same time, and the laser irradiation bearing capacity of the reflection cone is improved; furthermore, due to the adoption of the cavity structure, the probability that the reflection cone is polluted by dust is effectively reduced, and meanwhile, the exit escape rate of laser is reduced and measurement accuracy of the energy meter is improved.

Description

technical field [0001] The invention belongs to the field of high-energy laser parameter measurement, and relates to a total absorption energy meter used for high-energy laser energy measurement. 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, high light energy ...

AI Technical Summary

Problems solved by technology

[0005] (1) High energy escape rate: Part of the high-energy laser is reflected by the beam expander cone to the circumferential wall of the absorption cavity and then directly emitted from the entrance, so the laser escape rate is high, which will affect the measurement results; if you want to reduce the light escape rate , it is necessary to increase the absorption coefficient of the absorption cavity, which will cause the temperature of the absorption cavity to be too high, causing damage and surface oxidation

[0006] (2) The absorption cavity is made of metal or graphite. When the high-energy laser is emitted, the absorption cavity absorbs heat and causes surface oxidation, which will produce dust-like particles that fall on the reflective beam expander cone that is closer to the absorption cavity. One measurement will have an impact, and even cause the beam expander cone to be polluted and damaged

[0007] (3) The beam expander cone adopts a multi-stage hollow structure with cooling water in the middle, but experiments show that the beam expander cone is the weak link of the measurement system, and the flowing cooling water can theoretically take away more heat, but there are The problem of poor thermal conductivity makes the heat incident on the metal reflector cone cannot be dissipated as soon as possible, resulting in damage to the reflector cone

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