Very high-order pure Laguerre-Gaussian mode selection in a passive Q-switched Nd:YAG laser.
Very high-order pure Laguerre-Gaussian mode selection in a passive Q-switched Nd:YAG laser.
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DOI：
10.1364/opex.13.004952
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发表时间：
2005-06
期刊：
影响因子：
3.8
通讯作者：
A. Ishaaya;N. Davidson;A. Friesem
中科院分区：
文献类型：
--
作者：
A. Ishaaya;N. Davidson;A. Friesem
腔内相位元件与无源Q开关可饱和吸收器和合适的腔内孔径相结合，可以提供极高的模式辨别力，从而获得单一、纯、甚高阶拉盖尔高斯模式的激光操作。利用 Nd:YAG 激光器装置，在简并拉盖尔高斯 TEM04、TEM14、TEM24、TEM34 和 TEM44 模式下获得了良好控制和极其稳定的调Q 操作。测得的每种模式的每脉冲输出能量分别为 5.2mJ、7.5mJ、10mJ、12.5mJ 和 13.7mJ，而没有相位元件的高斯模式为 2.5mJ（输出能量增加了五倍以上）。校正这些模式的相位，使所有横向波瓣具有均匀的相位，从而在远场强度分布中产生非常明亮且狭窄的中心波瓣，理论上可以包含超过 90% 的输出能量。
An intra-cavity phase element, combined with a passive Q-switch saturable absorber and a suitable intra-cavity aperture, can provide extremely high mode discrimination, so as to obtain laser operation with single, pure, very high order Laguerre-Gaussian mode. With a Nd:YAG laser setup, well controlled and extremely stable Q-switched operation in the degenerate Laguerre-Gaussian TEM04, TEM14, TEM24, TEM34, and TEM44 modes was obtained. The measured output energy per pulse for each of these modes was 5.2mJ, 7.5mJ, 10mJ, 12.5mJ, and 13.7mJ respectively, compared to 2.5mJ for the Gaussian mode without the phase element (more than a five fold increase in output energy). Correcting the phase for these modes, so that all transverse lobes have uniform phase, results in a very bright and narrow central lobe in the far field intensity distribution that can theoretically contain more than 90% of the output energy.