Pinhole Design of Spatial Filter in High Energy Solid-State Laser System

Xin, 张鑫 Zhang; Hongjie, 刘红婕 Liu; Junpu, 赵军普 Zhao; Qiang, 袁强 Yuan; Wanjun, 代万俊 Dai; Wei, 周维 Zhou; Dongxia, 胡东霞 Hu; Xuejun, 蒋学君 Jiang

doi:10.3788/lop47.111402

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(2 citation statements)

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“…To improve the gain-uniformity of the plate amplifier and suppress the wavefront coherent addition, the MLS of SG-III takes the methods of off-axis beam propagation, beam size alteration and 90° spatial rotation [3]. The pinhole sizes in the spatial filters of SG-III are optimized to improve beam quality and operation reliability [14,15]. On the basis that the low-frequency modulation of the near-field beam caused by the undersized pinholes is avoided, the pinholes are expected to be small enough.…”

Section: Laser Physics Lettersmentioning

confidence: 99%

“…Besides, the intensity inhomogeneity is not expected because it may degrade the laser beam quality and cause serious optical damage [10][11][12]. The pinholes located at the focus of the spatial filters can strip out the high-frequency spatial components of the propagating beams, and thus are essential for improving the output beam quality [13][14][15]. A small pinhole is often used to filter out the unwanted spatial frequencies; however, the intensity of the laser may ablate the edge of the pinhole and result in pinhole closure due to the laser-ablated plasma.…”

Section: Introductionmentioning

confidence: 99%

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Object-oriented wavefront correction in an asymmetric amplifying high-power laser system

et al. 2018

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An object-oriented wavefront control method is proposed aiming for excellent near-field homogenization and far-field distribution in an asymmetric amplifying high-power laser system. By averaging the residual errors of the propagating beam, smaller pinholes could be employed on the spatial filters to improve the beam quality. With this wavefront correction system, the laser performance of the main amplifier system in the Shen Guang-III laser facility has been improved. The residual wavefront aberration at the position of each pinhole is below 2 µm (peak-to-valley). For each pinhole, 95% of the total laser energy is enclosed within a circle whose diameter is no more than six times the diffraction limit. At the output of the main laser system, the near-field modulation and contrast are 1.29% and 7.5%, respectively, and 95% of the 1ω (1053 nm) beam energy is contained within a 39.8 µrad circle (6.81 times the diffraction limit) under a laser fluence of 5.8 J cm−2. The measured 1ω focal spot size and near-field contrast are better than the design values of the Shen Guang-III laser facility.

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Section: Laser Physics Lettersmentioning

confidence: 99%