Q-switched laser with self-mode-filtering interferometric vortex output coupler
Q-switched laser with self-mode-filtering interferometric vortex output coupler
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DOI：
10.1364/osac.384837
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
J. W. T. Geberbauer;W. Kerridge-Johns;M. Damzen
中科院分区：
文献类型：
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作者：
J. W. T. Geberbauer;W. Kerridge-Johns;M. Damzen
涡旋激光器是一个有吸引力的前景，有效地产生高质量的光束在紧凑的，环境鲁棒性，和交钥匙系统。我们演示了Q开关，二极管泵浦的Nd：YVO4，TEM 00高斯激光器转换成涡旋激光源的输出耦合镜取代的涡旋输出耦合器（VOC）的基础上的不平衡Sagnac干涉仪。调Q VOC激光器产生了平均功率为5.1 W的涡旋输出，在150 kHz脉冲重复率下斜率效率为46%，仅略低于平面镜激光器的5.4 W和49%斜率效率。涡旋旋向性可通过单一VOC控制进行切换，而不会损失涡旋功率。在两种旋向性情况下，通过详细分析涡流相位分布和传播特性并与理想涡流进行比较，涡流模式质量被评估为优异。进一步的研究验证了VOC激光器自模式过滤内腔模式的能力，当等效平面镜激光器变成多模时，即使在引入故意模式以泵尺寸失配之后，也显示出高TEM 00质量的保持。这项工作突出了VOC作为高功率结构光源的简单途径的潜力，仅使用标准的高功率处理镜组件及其自模式滤波特性来补偿功率缩放时的腔内空间模式退化。
Vortex lasers are an attractive prospect for efficient generation of high-quality beams in compact, environmentally robust, and turnkey systems. We demonstrate conversion of a Q-switched, diode-pumped Nd:YVO4, TEM00 Gaussian laser into a vortex laser source by replacing the output coupling mirror by a vortex output coupler (VOC) based on an imbalanced Sagnac interferometer. The Q-switched VOC laser generated a vortex output with 5.1 W average power, slope efficiency of 46% at 150 kHz pulse repetition rate, only marginally lower than the 5.4W and 49% slope efficiency of the plane mirror laser. Vortex handedness was switchable with a single VOC control without loss of vortex power. In both handedness cases, the vortex mode quality was assessed to be excellent by detailed analysis of the vortex phase profile and propagation characteristics and comparison to an ideal vortex. Further investigation verified the ability for the VOC laser to self-mode-filter the intracavity mode, showing maintenance of high TEM00 quality even after introducing deliberate mode to pump size mismatch, when the equivalent plane mirror laser becomes multimode. This work highlights the potential of the VOC as a simple route to high powered structured light sources using just standard high-power handling mirror components and its self-mode-filtering property to compensate intra-cavity spatial mode degradation when power-scaling.