Dynamic Laser Parallel Fabrication Based on Multifocal Array

Zhiyong, 史志勇 Shi; Liqiang, 周立强 Zhou; Lichun, 张立春 Zhang; Zhigang, 李志刚 Li; Qiang, 史强 Shi; Linwei, 朱林伟 Zhu

doi:10.3788/aos202040.1014004

Cited by 3 publications

(1 citation statement)

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“…In actual femtosecond processing, there is a high requirement for the energy consistency of each focal point of the focal plane. In order to better evaluate the energy uniformity of the focal spots in each focal plane [15] , formula ( 4) is used to express :…”

Section: Proposed Methodsmentioning

confidence: 99%

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

Zhang

Chen

Duan

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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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.

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Section: Proposed Methodsmentioning

confidence: 99%

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

Zhang

Chen

Duan

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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Generation and Modulation of Controllable Multi-Focus Array Based on Phase Segmentation

et al. 2022

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A Circular-Sectorial Phase Segmentation (CSPS) noniterative method for effectively generating and manipulating muti-focus array (MFA) was proposed in this work. The theoretical model of the CSPS was built up based on vectorial diffraction integral and the phase modulation factor was deduced with inverse fast Fourier transform. By segmenting the entrance pupil into specified regions, which were sequentially assigned with the values carried out by phase modulation factor, the methodology could generate flexible MFAs with desired position and morphology. Subsequently, the CSPS was investigated in parallelized fabrication with a laser direct writing system. The positioning accuracy was greater than 96% and the morphologic consistency of the parallelly fabricated results was greater than 92%.

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基于混合算法的高均匀度超快激光分束及精密加工研究

Yang Lei,

Xu Xinyu,

Wang Jianlei

et al. 2023

中国激光

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Objective Ultrafast lasers possess desirable advantages in the field of precision processing owing to their short pulse widths and highenergy peak densities. However, singlefocus ultrafast laser processing technology suffers from low processing efficiencies.Parallel processing by beam splitting using a spatial light modulator (SLM) is a solution for improving the efficiency of ultrafast laser precision processing. Improving the multibeam uniformity after beam splitting is a key issue in ultrafast laser parallel processing. Two factors deteriorate the quality of multiple beams: the approximations in beamsplitting algorithms, which leads to poor calculation accuracy, and the poor beam quality of the laser in optical paths. To address these issues, a feedback GS -GA algorithm based on realtime feedback is proposed in this study.Methods A spatial light modulator is used for phaseonly modulation by loading computergenerated holograms (CGHs). The algorithms for beam splitting and shaping are dominated by the Gerchberg -Saxton (GS) algorithm and its derivatives. The GS

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Dynamic Laser Parallel Fabrication Based on Multifocal Array

Cited by 3 publications

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

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

Generation and Modulation of Controllable Multi-Focus Array Based on Phase Segmentation

基于混合算法的高均匀度超快激光分束及精密加工研究

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