High-energy laser energy measurement device based on rotating absorber

Abstract

The invention discloses a rotary absorber-based high-energy laser energy measuring device. The rotary absorber-based high-energy laser energy measuring device comprises a heat absorber, a temperature sensor and a temperature acquisition and processing unit, wherein the temperature sensor is embedded in the heat absorber and is electrically connected with the temperature acquisition and processing unit; a rotating shaft is arranged in the center of the heat absorber, so that the heat absorber and the temperature acquisition and processing unit can rotate around the rotating shaft; an incident surface of the heat absorber is provided with an annular V-shaped groove; the inner surface of the annular V-shaped groove is a diffuse reflection surface; the annular V-shaped groove has a sectional shape of two V-shaped groove structures along the rotating shaft; openings of the V-shaped groove structures face the high-energy laser incidence direction; and the aperture of the high-energy laser beam is less than the size of the openings of the V-shaped groove structures. According to the rotary absorber-based high-energy laser energy measuring device, a partial surface of the absorber is prevented from being irradiated by strong laser continuously by a mode of cyclic scanning of the laser beam to the surface of the heat absorber, the average laser power density irradiated to the surface of the heat absorber is reduced, and the anti-laser-damage threshold value of the measuring system is improved.

Description

Technical field [0001] The invention relates to a photothermal high-energy laser energy measuring device, in particular to an absolute measuring device suitable for long-term, high-energy, high-power density high-energy lasers. Background technique [0002] In the measurement of high-energy laser parameters, the total laser energy is one of the most basic and most important index parameters. It is often measured by photothermal method. For example, the laser is incident on a conical absorber made of graphite and other materials, and the absorber absorbs the incident laser. The energy is converted into its own temperature rise, and the total energy of the high-energy laser is calculated by measuring the temperature rise. With the development of high-energy laser technology, high-power, long-time lasers have become the direction of active development in various countries. How to achieve accurate measurement of its parameters has become a restrictive factor in the development of the...

AI Technical Summary

Problems solved by technology

[0003] In the measurement of high-energy laser energy in the existing total absorption energy meter, the light-receiving surface of the absorber has to bear all the long-term laser irradiation, and its ability to resist laser damage and destruction will become its technical bottleneck. Currently, the commonly used methods are: 1. , Water circulation conducts heat, and transfers heat to the outlet as soon as possible. This solution can reduce the temperature rise of the absorber after thermal equilibrium, but it cannot solve the damage to the absorber surface when the laser is irradiated to the absorber, and it is necessary to increase the circulation in the energy measurement device. The waterway will inevitably increase the structural complexity and affect the accuracy of the energy inversion results; Second, the anti-laser radiation film such as silicon carbide is sprayed on the surface of the absorber. The ability of this solution to increase the damage threshold is also very limited, and it increases system complexity

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