• Chinese Optics Letters
  • Vol. 17, Issue 4, 040501 (2019)
Baoxing Xiong1,2,3, Fan Gao1,2,3, Xiang Zhang1,2,3,*, and Xiao Yuan1,2,3
Author Affiliations
  • 1School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
  • 2Jiangsu Provincial Key Laboratory of Advanced Optical Manufacturing Technologies and Key Laboratory of Modern Optical Technologies of the Ministry of Education, Suzhou 215006, China
  • 3Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
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    DOI: 10.3788/COL201917.040501 Cite this Article Set citation alerts
    Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan, "Angular filtering by volume Bragg grating in photothermorefractive glass for nanosecond laser pulse," Chin. Opt. Lett. 17, 040501 (2019) Copy Citation Text show less

    Abstract

    The two-dimensional angular filter based on volume Bragg gratings in photothermorefractive glass for a nanosecond (ns) laser pulse is demonstrated. The experimental results show that the near-field beam quality of the laser pulse was effectively improved. The near-field modulation and contrast ratio were improved by 1.75 and 4.48 times, respectively. The power spectral density curves showed that the spatial frequencies more than 0.9 mm 1 in the x direction and 1.2 mm 1 in the y direction were effectively suppressed.
    η=sin2ν2+ξ21+ξ2/ν2,(1)

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    ν=πΔndλcosθrcosθs,(2)

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    ξ=πΔθsin(ϕθ0)dΛcosθs=πΔλd2n0Λ2cosθs.(3)

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    M=Imax/Iavg,(4)

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    C=1Iavgi=1N(IiIavg)2/N,(5)

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    Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan, "Angular filtering by volume Bragg grating in photothermorefractive glass for nanosecond laser pulse," Chin. Opt. Lett. 17, 040501 (2019)
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