Double-electro-optic modulation QNdi:YAG laser

Abstract

A dual-photoelectric Q-switched Nd:YAG laser includes a main optical path on a main oscillation axes composed of an output coupling mirror, a Nd:YAG bar, a polariser, a first 1 / 4 wave plate, a first Q-switched crystal and a first back control mirror arranged orderly, in which, said polarizer is in Brewster angle with the opposite direction of emitted laser, which is charactered that a Q-switched branch is along the direction of depolarization lost of the polarizer and is composed of a second 1 / 4 wave plate, a second Q-switched crystal and a second back cavity mirror. This invention adds a Q-switched branch along the depolarization lost output optical path on the basis of the traditional Q-switched polarization cavity, so that, lost component is fed back to the cavity along the original path via the Q-switched switch to form effective laser output.

Description

technical field [0001] The invention relates to a laser, in particular to a double electro-optic Q-switched Nd:YAG laser. Background technique [0002] Solid-state lasers with high average power, high repetition rate, and high beam quality have important application values ​​in the fields of industrial processing, military equipment, space communication, and medical diagnosis and treatment. With the continuous improvement of the output performance of high-power semiconductor laser diode arrays, semiconductor laser-pumped all-solid-state lasers (DPSSL) have rapidly become a hot spot in the development of lasers due to their small size, high efficiency, and long life. [0003] In high-power all-solid-state lasers, the pumping spectrum of the semiconductor laser diode and the absorption spectrum of the solid gain medium can be matched, but due to the significant increase in the power density of the pumping light in the medium, severe thermal effects will occur, causing thermall...

AI Technical Summary

Problems solved by technology

Among them, the thermally induced birefringence of the gain medium significantly degrades the polarization of the laser beam. When there is a polarizer in the cavity, the loss in the cavity increases significantly, which will directly lead to a decrease in laser output power and become an important factor restricting the increase in laser output power.

However, the serious thermal lens effect of the gain medium will reduce the volume of the oscillation mode in the gain activation region, and the effective utilization of the number of activated particles will decrease, which will ultimately limit the improvement of laser efficiency.

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