基于失调量的光学折叠腔稳定性研究及应用

In order to optimize the deisgning of laser resonant cavity, analytical solutions concerning Gaussian beam were derived in a three-mirror folded cavity by using the theory of optical propagation matrix. The cavity stability of the folded cavity laser is investigated with a simplified model. The influence of resonator parameters, such as folded mirror focus, cavity length and curvature radius, on the stability of Q-switched lasers is studied. According to theoretical analysis, we selected a mechanical Q-switched CO2 pulse laser as an application example. It was found that in a special case the folded cavity can work with two stability zones, instead of only one stability zone under general circumstances. Adopting maladjusted amount instead of factor g as parameter, the maladjusted error is derived directly, which is convenience for the application. The conclusion we have gained has important guiding significance for the designing of the laser.