Temperature control method of laser medium of disk laser and device thereof

Abstract

The invention relates to a temperature control method of laser medium of a disk laser and a device thereof. The method comprises the steps that temperature control is performed on laser medium in different regions through a semiconductor refrigerating chip array; firstly reference temperature is set, laser medium subregions, the temperature of which is higher than the reference temperature, are refrigerated, and laser medium subregions, the temperature of which is lower than the reference temperature, are heated; the device comprises the laser medium, a heat sink connected with the laser medium, heat-conducting glue, a temperature sensor on the heat-conducting glue, the semiconductor refrigerating chip array, a closed-loop circuit control system and a computer system; the temperature sensor detects the practical temperature of the laser medium subregions in real time, sends the practical temperature to the computer system, and sends temperature control signals after the practical temperature is compared to the reference temperature; and a closed-loop circuit feeds back the temperature control signals to semiconductor refrigerating chips in real time, so as to realize the real-time control to the laser medium subregions, and to realize the bulk temperature control to the laser medium. The method can dynamically control the temperature of the laser medium to be evenly distributed, and effectively restrain the problem of the thermal effect of the laser medium.

Description

technical field [0001] The invention relates to a temperature control technology of a laser medium, in particular to a method and a device for controlling the temperature of a laser medium of a sheet laser, and belongs to the technical field of solid-state lasers. Background technique [0002] In the development of high average power all-solid-state lasers, improving the output power and brightness of diode-pumped all-solid-state laser systems has always been the main task and goal of laser researchers. However, in an all-solid-state laser system, the laser medium absorbs the pump light energy, causing the population inversion of the activated particles to generate laser oscillations. At the same time, only a part of the pump light energy is converted into laser radiation, while the rest of the energy is converted from non-radiative transitions. And it is absorbed by the crystal and converted into heat energy and deposited inside the laser medium, which makes the inside of t...

AI Technical Summary

Problems solved by technology

However, in the actual working process of thin-sheet lasers, it is difficult to achieve uniform pumping of the entire aperture, and the cooling conditions on each surface of the thin-sheet laser are different, and non-uniform temperature gradient distribution will also occur in the thin-sheet laser medium, which is inevitable when working at high power The serious thermal effect is caused, which also leads to the problem that the laser output power is difficult to be further improved and the beam quality is reduced.

Images