Lens Design Based on Ghost Image and Aberration Analysis in High-Power Laser Facility

Hongjie, 刘红婕 Liu; Lanqin, 刘兰琴 Liu; Jingqin, 粟敬钦 Su; Dongxia, 胡东霞 Hu; Wei, 周维 Zhou; Junpu, 赵军普 Zhao; Wenyi, 王文义 Wang; Lei, 莫磊 Mo; Xinying, 蒋新颖 Jiang; Xuejun, 蒋学君 Jiang; Kun, 张崑 Zhang; Qihua, 朱启华 Zhu; Haiwu, 於海武 Yu; Feng, 景峰 Jing

doi:10.3788/aos20082805.0976

Cited by 2 publications

(1 citation statement)

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“…According the energy of the high-power lasers and the residual reflectivity, it is necessary to consider the ghost images from the first order to the fourth order [3]. For simplicity, the lens is divided to three common types to discuss respectively, they are equi-convex (r 1 =-r 2 ), meniscus lens (r 1 :r 2 =1:3) [7] and plano-convex. Since most lens in high-power facilities are large diameter that d<<r, we use the factor of lens parameter ratio d/r (d/r<<1) and the high orders are omitted to simplify each order of ghost images focal spot.…”

Section: Calculation and Analysismentioning

confidence: 99%

Further discussion on ghost images in high-power laser facilities

Zhang

et al. 2009

2009 Conference on Lasers &Amp; Electro Optics &Amp; The Pacific Rim Conference on Lasers and Electro-Optics

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Section: Calculation and Analysismentioning

confidence: 99%

Further discussion on ghost images in high-power laser facilities

Zhang

et al. 2009

2009 Conference on Lasers &Amp; Electro Optics &Amp; The Pacific Rim Conference on Lasers and Electro-Optics

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Total internal reflection orders in transmission grating

Rong¹,

Yu-Ting²,

Zhao³

et al. 2016

Acta Phys. Sin.

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In a current high-power laser system, transmission grating has been used to sample, separate and focus laser beam. Under high power laser irradiation, besides the 0-order shooting beam and target sampling beam, the detrimental influence of other diffraction orders should be taken into consideration seriously. These useless orders may damage other nearby optical elements and mechanical devices, disturb and confuse the measurement of time pulse and near/far-field intensity. Especially the total internal diffraction order will lead to some series diffraction patterns, causing the above problems. First, relevant theoretical calculation and analysis are carried out for transmission grating (including beam sample grating and focusing grating), which can predict and indicate these inconspicuous diffraction orders. These orders appear on four receiving screens regularly and periodically, and the periodic distance between them is determined by ray-tracing draft. Second, the phenomenon of total internal reflection order is observed and measured by combining with anti-reflection film. The measured periodic spacings on three screens are 24 mm, 26 mm and 35 mm, respectively. Moreover, energy intensities of these redundant orders are measured finely, which shows that their contrasts or SNRs to 0-order main laser is in a range of 10-8-10-4). Finally, some appropriate and effective approaches to eliminating or avoiding total internal reflection and other useless orders are proposed and discussed, which include 1) coating by anti-reflection film with pre-deep etching; 2) optimizing the grating design to make redundant orders far from target spot; 3) placing laser scattering or absorbing devices at corresponding position to avoid being damaged by the side-leakage energy and ghost image of total internal reflection and other redundant orders.

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Lens Design Based on Ghost Image and Aberration Analysis in High-Power Laser Facility

Cited by 2 publications

References 0 publications

Further discussion on ghost images in high-power laser facilities

Further discussion on ghost images in high-power laser facilities

Total internal reflection orders in transmission grating

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