Regulatory method of 3D multi-focus controllable distribution based on computer generated holography

Ruidi Zhang; Xiaoyi Chen; Yaxuan Duan; Pu Wang; Zhengshang Da

doi:10.1117/12.2668871

21 March 2023 Regulatory method of 3D multi-focus controllable distribution based on computer generated holography

Ruidi Zhang, Xiaoyi Chen, Yaxuan Duan, Pu Wang, Zhengshang Da

Proceedings Volume 12595, Advanced Fiber Laser Conference (AFL2022); 125951U (2023) https://doi.org/10.1117/12.2668871
Event: Advanced Fiber Laser Conference (AFL2022), 2022, Changsha, China

Abstract

Traditional analytical algorithm needs to combine the transmission functions of grating and lens to generate a Computer Generated Hologram (CGH), so as to realize the distribution of three-dimensional (3D) multi-focal points in space, but the grating phase will inevitably produce high-order diffraction focus, resulting in energy loss, and the traditional analytic algorithm is more suitable for generating array multi-focal distribution with equal spacing. To solve this problem, this paper simplifies the traditional analytical algorithm, and proposes a method that only uses multi-lens phase and random phase superposition to generate the CGH required by the target light location, by changing the focal length of the lens phase, the multi-focus distribution along the z-axial direction of multiple independent focal planes is realized. Then the phase of these different focal planes is superimposed, and a 0~2π random phase modulation is added, which can quickly generate 3D multi-focus distribution with controllable number and position. The simulation results show that the energy uniformity of focal spot on each focal plane is between 89.45% and 98.08%. The experimental results show that the energy uniformity of focal spots on each focal plane is between 88.40% and 96.13%, which is consistent with the simulation results. Compared with traditional analytical algorithm, the proposed method is more universal for multi-focus distribution in 3D space without special requirements of array distribution with equal spacing, and has potential application value in laser processing, holographic optical tweezers, optical communication and other fields.

Citation Download Citation

Ruidi Zhang, Xiaoyi Chen, Yaxuan Duan, Pu Wang, and Zhengshang Da "Regulatory method of 3D multi-focus controllable distribution based on computer generated holography", Proc. SPIE 12595, Advanced Fiber Laser Conference (AFL2022), 125951U (21 March 2023); https://doi.org/10.1117/12.2668871

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KEYWORDS

Computer generated holography

3D acquisition

Modulation

Diffraction

Laser processing

Phase modulation

Liquid crystals

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