Arbitrary pattern projection through long and unfixed multimode fiber with wavefront shaping

Shengfu Cheng; Tianting Zhong; Chi Man Woo; Puxiang Lai

doi:10.1117/12.2650845

27 March 2023 Arbitrary pattern projection through long and unfixed multimode fiber with wavefront shaping

Shengfu Cheng, Tianting Zhong, Chi Man Woo, Puxiang Lai

Proceedings Volume PC12379, Photons Plus Ultrasound: Imaging and Sensing 2023; PC1237920 (2023) https://doi.org/10.1117/12.2650845
Event: SPIE BiOS, 2023, San Francisco, California, United States

Conference Poster

Abstract

Focusing light into an arbitrary pattern through multimode fiber is highly desired in energy delivery-related biomedical applications and has been demonstrated feasible with wavefront shaping. Here, the strategy relying on natural gradient ascent-based parameter optimization is shown to search the optimal wavefront rapidly towards high-quality pattern projection through a multimode fiber. Meanwhile, a new fitness function based on cosine similarity is adopted to replace the commonly used Pearson correlation coefficient, which leads to higher pattern contrast without sacrificing the fidelity with the target. With the proposed scheme, long-distance projection of arbitrary pattern was demonstrated through a 15-meter unfixed multimode fiber, showing fast convergence and better anti-interference ability. The superior performance of our approach for generating arbitrary pattern may gains special interest in multimode fiber based deep-tissue photon therapy and optogenetics.

Citation Download Citation

Shengfu Cheng, Tianting Zhong, Chi Man Woo, and Puxiang Lai "Arbitrary pattern projection through long and unfixed multimode fiber with wavefront shaping", Proc. SPIE PC12379, Photons Plus Ultrasound: Imaging and Sensing 2023, PC1237920 (27 March 2023); https://doi.org/10.1117/12.2650845

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