高功率准连续波腔内和频全固态黄光激光器

报道了高功率准连续波腔内和频全固态黄光激光器的研究结果.为获得高功率的黄光输出，首先，激光器采用准连续方式运转，在保持抽运水平的条件下降低热效应，从而提高光束质量和光光转换效率；第二，采用热近非稳腔腔型设计，双棒串接补偿热致双折射技术，获得大基模体积高光束质量的基频光；第三，通过优化腔型，采用L型共折叠臂平-凹对称腔，使两束基频光达到空间重合且满足功率配比.通过这些方法，得到了输出功率7.6W，重复频率1.1kHz的准连续波黄光输出.据我们所知，这是目前腔内和频方案所获得的最高功率全固态黄光输出. 关键词： 黄光激光 腔内和频 Nd：YAG激光 全固态激光器

A high power quasi-continuous-wave yellow laser based on intracavity sum-frequency generation

This paper reports a high-power all-solid-state yellow laser based on intracavity KTP crystal sum-frequency generation. In order to achieve high output power，three key techniques are used：Firstly，the system is designed to operate in a pulsed mode to increase the beam quality and optical-to-optical conversion efficiency under the same pump level. Secondly，thermal near-unstable resonator design and two-rod birefringence compensation is used to acquire large fundamental mode size in Nd：YAG rod. Thirdly，by optimizing an L-shaped co-folding-arm plane-concave symmetrical cavity，the two fundamentals have a high spatial overlap in the sum-frequency crystal and satisfy the power ratio requirement. As a result of the applications of these techniques，a quasi-continuous-wave yellow laser with output power of 7.6W and repitition frequency of 1.1kHz is obtained. To the best of our knowledge，this is the highest yellow laser output power produced by an intracavity sum-frequency Nd：YAG laser.