A passive Q-switched laser based on polarization synthesis laser gain

Abstract

The invention discloses a passive Q-switched laser based on polarization synthesis laser gain. The passive Q-switched laser includes: a pump source, a focusing coupling mirror group, a total reflection mirror, a polarized laser medium, a half-wave plate, a polarizer, a passive Q-switched crystal and output mirror, wherein: the pump source, focusing coupling mirror group, total reflection mirror, polarized laser medium, half-wave plate, polarizer, passive Q-switched crystal and output mirror are arranged optically coaxially in sequence, and the The all-reflective mirror and the output mirror form a resonant cavity; the polarized laser medium and the half-wave plate form a polarization synthesis gain control function module, which controls the gain of the passive Q-switched laser by rotating the half-wave plate, and realizes effective control of the passive Q-switched laser. pulse frequency. The solution of the invention can achieve gain control of the passive Q-switched laser itself without changing the pump power, without affecting the thermal effect of the crystal, and maintaining a stable state of the resonator, thereby achieving the technical effect of effectively adjusting the frequency of the passive Q-switched laser.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a passive Q-switched laser based on polarization synthesis laser gain. Background technique [0002] Passive Q-switched lasers have the advantages of small size, low cost, and compact structure, and have broad market application prospects in laser engraving, display, and stage scenery. [0003] Passive Q-switching is often used in continuous-pumped lasers to obtain high repetition rate pulsed laser output. From the characteristics of passive Q-switching technology, it can be seen that a key point for forming laser pulses is that the laser gain must reach the threshold of the laser. In continuous pumped passive Q-switched lasers, there are often confusions in which the timing and frequency of laser pulses are different. This is because in the multi-mode state, the laser threshold of each mode is different. In order to obtain a stable pulse Q-switched laser output under this condit...

AI Technical Summary

Problems solved by technology

Therefore, conventional methods are used during the operation of the output frequency of passive Q-switched lasers, and the frequency of Q-switched pulses cannot be effectively adjusted, thus limiting the wide application of passive Q-switched lasers.

Images