16 August 2010 Spatial filter with volume gratings for high-peak-power multistage laser amplifiers
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Abstract
The regular spatial filters comprised of lens and pinhole are essential component in high power laser systems, such as lasers for inertial confinement fusion, nonlinear optical technology and directed-energy weapon. On the other hand the pinhole is treated as a bottleneck of high power laser due to harmful plasma created by the focusing beam. In this paper we present a spatial filter based on angular selectivity of Bragg diffraction grating to avoid the harmful focusing effect in the traditional pinhole filter. A spatial filter consisted of volume phase gratings in two-pass amplifier cavity were reported. Two-dimensional filter was proposed by using single Pi-phase-shifted Bragg grating, numerical simulation results shown that its angular spectrum bandwidth can be less than 160urad. The angular selectivity of photo-thermorefractive glass and RUGATE film filters, construction stability, thermal stability and the effects of misalignments of gratings on the diffraction efficiencies under high-pulse-energy laser operating condition are discussed.
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Yi-zhou Tan, Yi-zhou Tan, Yi-sheng Yang, Yi-sheng Yang, Guang-wei Zheng, Guang-wei Zheng, Ben-jian Shen, Ben-jian Shen, Heng-yue Pan, Heng-yue Pan, Li Liu, Li Liu, } "Spatial filter with volume gratings for high-peak-power multistage laser amplifiers", Proc. SPIE 7789, Laser Beam Shaping XI, 77890P (16 August 2010); doi: 10.1117/12.861099; https://doi.org/10.1117/12.861099
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