Vortex laser by transforming Gaussian mode with an interferometric output coupler.
Vortex laser by transforming Gaussian mode with an interferometric output coupler.
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DOI：
10.1364/oe.27.011642
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发表时间：
2019-04
期刊：
影响因子：
3.8
通讯作者：
W. Kerridge-Johns;J. W. T. Geberbauer;M. Damzen
中科院分区：
文献类型：
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作者：
W. Kerridge-Johns;J. W. T. Geberbauer;M. Damzen
直接从激光源产生涡旋光束在功率和效率上受到限制，或者受到特定泵浦源和增益介质的限制。在这里，我们提出了一种新的高功率和高效率的涡旋激光方法，干涉模式变换作为输出耦合，它使用高功率处理和低损耗的光学器件，具有波长通用性。在二极管泵浦Nd:YVO4激光器中进行了实验演示，使用不平衡Sagnac干干仪作为输出耦合器，产生高质量的涡旋输出光束（M2 = 2.07），具有完全可选择的手性控制，同时保持腔内模式为基本高斯模式。与等效的TEM00激光器相比，产生涡旋输出功率bbbb3w的效率只有很小的降低。实验研究了涡流输出耦合传输和涡流质量的连续变化，结果与理论吻合较好。这项工作揭示了一种通过干涉空间模式变换直接从光源获得高功率结构激光辐射的新方法。
Generation of vortex beams directly from the laser source can be limited in power and efficiency, or to specific pump sources and gain media. Here, we propose a new high power and high efficiency vortex laser methodology with interferometric mode transformation as output coupling, which uses high power handling and low loss optics that have wavelength versatility. Experimental demonstration is made in a diode-pumped Nd:YVO4 laser using an imbalanced Sagnac interferometer as output coupler producing high quality vortex output beams (M2 = 2.07) with fully selectable control of handedness whilst the intracavity mode is maintained as a fundamental Gaussian. Vortex output power >3W is produced with only small reduction in efficiency compared to the equivalent TEM00 laser. Continuous variation of vortex output coupling transmission and the quality of the vortex is investigated experimentally showing good agreement with theory. This work reveals a new approach to high power structured laser radiation direct from the source through interferometric spatial mode transformations.