基于键合晶体的径向偏振固体激光器研究进展

Recent Development in Radially Polarized Solid-State Laser with Composite Laser Crystal

径向偏振光束特有的偏振分布特性和聚焦特性使其在许多领域中都有重要应用前景,成为近年来的研究热点之一。采用偏振选择镜(光子晶体光栅镜)为选模器件是获得径向偏振激光的一项热门技术。介绍了以偏振选择镜为选模器件的径向偏振固体激光器的研究进展。针对微片径向偏振激光器热效应影响严重、强抽运作用下出现功率饱和的现象,总结了用键合结构增益介质来改善激光介质导热特性、提升径向偏振固体激光器性能的进展,包括基于键合结构晶体连续输出的瓦级径向偏振固体激光器、基于键合结构晶体的径向偏振主动调Q脉冲激光器和基于键合结构晶体的径向偏振被动调Q脉冲激光器。

Radially polarized beam is one of the present hotspots and has great potential applications in many fields due to its special focus properties and polarization state. It becomes a hot technology to acquire radially polarized beam by use of photonic crystal grating as the mode selector. We summarize the recent research progress on radially polarized solid-state laser. Concerning the previous research on microchip radially polarized laser, in which the output power is limited due to the strong thermal effects of the lasing material at intensive pumping, a bonded crystal is chosen as the lasing material to weaken the temperature gradient in the lasing area and thereafter the thermal lens effect at the presence of intensive pumping. And the recent progress of lasers based on bonded crystal such as continuous wave radially polarized solid-state laser, passively switched radially polarized laser is summarized. Q-switched radially polarized laser and actively Q-