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Directly Determining Orbital Angular Momentum of Ultrashort Laguerre–Gauss Pulses via Spatially-Resolved Autocorrelation Measurement
Laser & Photonics Reviews ( IF 11.0 ) Pub Date : 2022-08-03 , DOI: 10.1002/lpor.202200260
Bing‐Shi Yu 1 , Chun‐Yu Li 1 , Yuanjie Yang 2 , Carmelo Rosales‐Guzmán 1, 3 , Zhi‐Han Zhu 1
Affiliation  

Autocorrelation measurement based on second-harmonic generation (SHG), the best-known technique for measuring the temporal duration of ultrashort pulses, dates back to the birth of ultrafast lasers. Here, it is proposed and experimentally demonstrated that such well-established technique can be used to measure the orbital angular momentum of ultrashort Laguerre–Gauss (LG) pulses. By analyzing the spatial spectrum (i.e., the far-field pattern) of the SHG signal with a spatially-resolved detector, the full spatial structure of ultrashort LG pulses, including both azimuthal and radial indices, are unambiguously determined. The results provide an important advancement for the well-established autocorrelation technique by extending it to reach its full potential in laser characterization, especially for structured ultrashort pulses.

中文翻译:

通过空间分辨自相关测量直接确定超短拉盖尔-高斯脉冲的轨道角动量

基于二次谐波产生 (SHG) 的自相关测量是用于测量超短脉冲时间持续时间的最著名技术,可追溯到超快激光器的诞生。在这里,提出并通过实验证明,这种成熟的技术可用于测量超短拉盖尔-高斯 (LG) 脉冲的轨道角动量。通过使用空间分辨探测器分析 SHG 信号的空间谱(即远场模式),可以明确确定超短 LG 脉冲的完整空间结构,包括方位角和径向指数。该结果通过扩展自相关技术以充分发挥其在激光表征中的潜力,特别是对于结构化超短脉冲,为成熟的自相关技术提供了重要的进步。
更新日期:2022-08-03
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