热透镜控制激光光束质量技术研究

发布时间：2018-01-23 02:51

本文关键词： 固体激光器热透镜空间分布光束质量　出处：《应用光学》2017年01期 　论文类型：期刊论文

【摘要】：在端面抽运固体激光器中,就如何改善在高抽运功率时输出激光的光束质量,提出一种激光器的设计方法。在激光器谐振腔中放入多根掺杂浓度不同的激光介质,利用激光介质内部产生的热透镜控制抽运光和基模振荡光的空间分布,并且最大限度地使抽运光的分布区和基模振荡光分布区重叠,实现抽运光与基模振荡光在空间上高度匹配,进而提高抽运光能量的利用效率和振荡光的光束质量。实验表明,在不同抽运功率下,抽运光和基模振荡光在晶体内部的光斑的空间分布可通过热透镜加以控制。在端面抽运功率200 W附近时,实现了抽运光与基模振荡光较高程度匹配,光束质量因子M2由14.7改善为4.1。
[Abstract]:In the end pumped solid-state laser, how to improve the laser beam quality at high pump power. A design method of laser is presented in which the laser medium with different doping concentration is added into the resonator and the spatial distribution of the pumped light and the fundamental mode oscillating light is controlled by the thermal lens produced in the laser medium. Moreover, the distribution area of pumping light and the distribution region of fundamental mode oscillating light are overlapped to the maximum extent, so that the pumped light and the fundamental mode oscillating light can be highly matched in space. The efficiency of energy utilization and the beam quality of oscillating light are improved. The spatial distribution of the pumping light and the fundamental mode oscillating light in the crystal can be controlled by the thermal lens. When the end pumped power is around 200W, a high degree matching between the pump light and the fundamental mode oscillation light is realized. The beam quality factor M2 is improved from 14.7 to 4.1.
【作者单位】：西安电子科技大学物理与光电工程学院;
【基金】：国家预研究基金(9140A020105)
【分类号】：TN248.1
【正文快照】： 引言激光二极管(LD)抽运的全固态激光器(DPSSL)以其效率高、寿命长、结构紧凑、光束质量好等优点,被广泛应用于工业、医疗、科研、信息和军事等领域[1-5]。在LD抽运过程中,由于存在量子差损等过程,导致了其输入的总能量中只有部分转化为激光输出,其余能量大部分为热消耗[6]。

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