Angular filtering by volume Bragg grating in photothermorefractive glass for nanosecond laser pulse

Baoxing Xiong; Fan Gao; Xiang Zhang; Xiao Yuan

doi:10.3788/COL201917.040501

Journals >Chinese Optics Letters >Volume 17 >Issue 4 >Page 040501 > Article

Chinese Optics Letters
Vol. 17, Issue 4, 040501 (2019)

Angular filtering by volume Bragg grating in photothermorefractive glass for nanosecond laser pulse

Baoxing Xiong^1、2、3, Fan Gao^1、2、3, Xiang Zhang^{1、2、3、*}, and Xiao Yuan^1、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[J]. Chinese Optics Letters, 2019, 17(4): 040501 Copy Citation Text

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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 mm¹ in the x direction and 1.2 mm¹ in the y direction were effectively suppressed.

η = \frac{\sin^{2} \sqrt{ν^{2} + ξ^{2}}}{1 + ξ^{2} / ν^{2}},

(1)

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ν = \frac{π Δ n d}{λ \sqrt{\cos θ_{r} \cos θ_{s}}},

(2)

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ξ = \frac{π Δ θ \sin (ϕ - θ_{0}) d}{Λ \cos θ_{s}} = - \frac{π Δ λ d}{2 n_{0} Λ^{2} \cos θ_{s}} .

(3)

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M = I_{\max} / I_{avg},

(4)

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C = \frac{1}{I_{avg}} \sqrt{\sum_{i = 1}^{N} {(I_{i} - I_{avg})}^{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[J]. Chinese Optics Letters, 2019, 17(4): 040501

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