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17 August 2023 Generation, verification, and imaging of ultrafast rotating optical field based on a pure optical method
Ruiwei Ye, Wenkai Wang, Jianhua Zhu, Xuanke Zeng, Yi Cai, Shixiang Xu
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Proceedings Volume 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023); 127573I (2023) https://doi.org/10.1117/12.2690199
Event: 3rd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2023), 2023, Kunming, China
Abstract
By coherently superimposing two chirped vortex pulses with frequency differences and conjugate topological charges, a tunable ultrafast rotating optical field is generated. The interfering device is an asymmetric Michelson interferometer. There are three parameters to regulate the ultrafast rotating optical field: the topological charge difference ∆l; the chirp constant C; the optical path difference of the two interference pulses Δt. The experiment obtained the dynamic image of the rotating optical field by the nonlinear sampling ultrafast imaging, the rotational angular velocity measured in the experiment is 2.368 Trad/s, which are in good agreement with the theoretical calculations. Two nonlinear imaging mechanisms, sum-frequency generation (SFG) and optical parametric amplification (OPA), are applied for ultrafast nonlinear sampling. The results show that at the same rotational angular velocity of the rotating optical field, the image quality of OPA imaging is better than that of SFG imaging. These rotation optical fields at Trad/s level have important potential applications in particle acceleration, vortex THz wave generation, laser fine machine, etc.
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Ruiwei Ye, Wenkai Wang, Jianhua Zhu, Xuanke Zeng, Yi Cai, and Shixiang Xu "Generation, verification, and imaging of ultrafast rotating optical field based on a pure optical method", Proc. SPIE 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023), 127573I (17 August 2023); https://doi.org/10.1117/12.2690199
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KEYWORDS
Angular velocity
Ultrafast imaging
Optical parametric amplifiers
Sum frequency generation
Nonlinear optics
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