华东师范大学物理与材料科学学院精密光谱科学与技术国家重点实验室, 上海 200062
提出一种利用干涉实现涡旋光束轨道角动量简易检测的新方法。使用空间光调制器产生涡旋光束时,仅由调制的涡旋光束和未能完全调制的入射高斯光束即可直接发生同轴干涉,产生完美的花瓣状干涉图案,且干涉花瓣数量与涡旋光束携带的轨道角动量值一致,因此,检测由空间光调制器产生的涡旋光束轨道角动量时不需要额外使用参考干涉光。利用该干涉分析了Bessel-Gaussian光束和Laguerre-Gaussian光束的干涉图案,所得结果不仅能反映光束的轨道角动量值——角向因子,还能反映轨道角动量的正负以及Laguerre-Gaussian光束的径向因子,且干涉模式清晰,稳定性高。
光栅 涡旋光束 轨道角动量 干涉 空间光调制器 激光与光电子学进展
2019, 56(14): 140502
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China
We demonstrate a scheme to use a Littman configuration external cavity diode laser (ECDL) as a stable-frequency light source to stabilize two cw single-mode Ti:sapphire lasers for laser cooling of magnesium fluoride molecules. An ECDL based on the Littman configuration is constructed and stabilized by a digital signal processor system. We stabilize the frequency of our ECDL to ±0.77 MHz precision over 10 h and the Allan standard deviation reaches 2.6×10 11 at an integration time of 10 s. We lock two Ti:sapphire lasers through a transfer cavity, and either laser has a long-term frequency stability of ±2.5 MHz.
140.3425 Laser stabilization 140.2020 Diode lasers 020.3320 Laser cooling Chinese Optics Letters
2016, 14(7): 071403
