Characteristics of plasma in spatial filter pinhole of high power laser system

Xin, 张鑫 Zhang; Qiang, 袁强 Yuan; Junpu, 赵军普 Zhao; Dongxia, 胡东霞 Hu; Wanjun, 代万俊 Dai; Wei, 周维 Zhou; Xuejun, 蒋学君 Jiang; Wu, 邓武 Deng; Kun, 张崑 Zhang

doi:10.3788/hplpb20102212.2921

强激光与粒子束

2010

DOI: 10.3788/hplpb20102212.2921

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Characteristics of plasma in spatial filter pinhole of high power laser system

张鑫 Zhang Xin¹,

袁强 Yuan Qiang²,

赵军普 Zhao Junpu³

et al.

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2014

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“…The combined device is composed of long-wave-pass and short-wave-pass cutoff filters, which is designed using the steep side of the minus filters. The long-wavepass and short-wave-pass cutoff filters are, respectively, designed with the following starting layer structure: glass/(0.7598H0.7638L0.32345H) 1 (0.32345H0.6635L0.413 5H) 1 0.97(0.3655H0.73L0.3655H) 3 (0.3655H0.73L0.3655H) 60 0.99(0.3655H0.73L0.3655H) 7 (0.7925H0.8713L0.2796H) 1 (0.2796 H0.2999L0.37925H) 1 (0.37925H0.8850L0.8245H) 1 /air and glass/(0.8309H0.9003L0.4155H) 1 (0.4155H0.9002L0.8333H) 1 (0.5HL0.5H) 1 (0.5HL0.5H) 50 1.02(0.5HL0.5H) 3 (0.6429H0.9041L 0.4237H) 1 (0.4237H2.1188L) 1 /air.…”

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confidence: 99%

Design and fabrication of thin-film spatial filter

Zhang¹,

Huang²,

Yao³

et al. 2014

中国光学快报

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In the high-power laser system, the pinhole spatial filter is widely used for beam cleanup, its requisite focusing of the laser beam presents poor functionality [1]. The energy intensity at the focal plane of the pinhole filter is more than 10 12 W/cm 2. So the plasma closure may be probably caused and the material of the pinhole plate is easily burned [2,3]. As a hard-edge diaphragm, the low-frequency diffractive rings are likely to appear [4,5]. The spatial filter has the advantages of filtering out the rapid growing non-linear components of spatial frequency, and effectively improving the beam quality and so on [6-15]. Spatial filter is an important optical application of the thin-film technology. Non-focusing spatial filtering technique bases on multilayer dielectric film. By the matrix transfer method, the diffraction efficiencies, angular spectrum bandwidths, and the light spectrum bandwidths of multilayer dielectric film are analyzed. The combination thin-film has better spatial filtering performance than that of the combination of lens and pinhole. We design the spatial filtering is using three different methods and analyze their advantages and disadvantages. Finally, we find out the best optimized method and the film is deposited by ion-beam sputtering technique. The microstructure, composition, and optical properties have been investigated by scanning electron microscopy (SEM) and spectrophotometer. The result shows that the film has optically flat and uniform surface and the structure of the film is compact. The result also shows that the transmittance can be attenuated by the absorption of materials, thickness errors, and refractive index inhomogeneity in the process of the film depositing. At the same time, the course of manufacturing the film is needed to be controlled accurately in order to gain result which is consistent with the calculated results.

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mentioning

confidence: 99%

Design and fabrication of thin-film spatial filter

Zhang¹,

Huang²,

Yao³

et al. 2014

中国光学快报

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Characteristics of plasma in spatial filter pinhole of high power laser system

Cited by 1 publication

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Design and fabrication of thin-film spatial filter

Design and fabrication of thin-film spatial filter

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