Ms. Jiamei Li Profile

Jiamei Li

at Shanghai Institute of Optics & Fine Mechanics CAS

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Proceedings Article | 11 August 2022 Paper

Improvement of MRAF algorithm based on high energy efficiency for beam shaping

Hui Yu, Jiamei Li, Dawei Li, Qiong Zhou, Fengnian Lv, Xingqiang Lu

Proceedings Volume 12307, 1230705 (2022) https://doi.org/10.1117/12.2643562

KEYWORDS: Energy efficiency, Beam shaping, Laser applications, Fourier transforms

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To meet the specific needs or improve the system’s energy efficiency, it is necessary to integrate the beam into a specific intensity distribution beam. This paper establishes a set of rules based on the mixed-region amplitude freedom (MRAF) algorithm, and a beam shaping algorithm is proposed to calculate the intensity distribution by setting the energy efficiency. Simulation results show that compared with the traditional Gerchberg–Saxton (GS) algorithm, the convergence effect improved by one to two orders of magnitude after abandoning controlling a small part of the energy; compared with the MRAF algorithm, the energy efficiency converged to the preset target value, in addition, the energy efficiency is higher under the same convergence intensity. This algorithm provides a new path for shaping in femtosecond laser processing technology.

Proceedings Article | 6 June 2021 Paper

Optimization of disposable debris shield in high-energy PW laser focusing system

Jiamei Li, Hui Yu, Dawei Li, Qiong Zhou, Xingqiang Lu

Proceedings Volume 11849, 1184903 (2021) https://doi.org/10.1117/12.2599130

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In inertial confinement fusion laser device, the disposable debris shield is necessary to protect expensive optical elements from the contaminations of target debris when high-energy PW laser was focused in the terminal focusing system. While the shield plate will have a very important impact on the focusing quality. In this paper, the design of debris shield, in high-energy PW focusing system, is studied by optical transmission theory, and the design parameters, such as PV value of wavefront, thickness and installation position of shield plate, are optimized. If 95% of the focal spot energy is concentrated within 10DL, the B-integral introduced by the debris shield should not exceed 8.5 rad when the plate is placed at 0.1f from the parabolic mirror. When the laser power is 1PW, the installation position of 3mm shield cannot exceed 0.29f. The influence of wavefront PV value on energy concentration of focal spot is little. A 3mm shield plate has good damage resistance on light field modulation when its size over 350μm. And the thinner the thickness is, the better the resistance is. This work is important for the arrangement and optimization of disposable debris shield in high-power PW laser focusing system.

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