Angular filtering by volume Bragg grating in photothermorefractive glass for nanosecond laser pulse
Angular filtering by volume Bragg grating in photothermorefractive glass for nanosecond laser pulse
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用于纳秒激光脉冲的光热折射玻璃中体布拉格光栅的角度过滤
DOI：
10.3788/col201917.040501
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发表时间：
2019
影响因子：
3.5
通讯作者：
Yuan Xiao
中科院分区：
文献类型：
--
作者：
Xiong Baoxing;Gao Fan;Zhang Xiang;Yuan Xiao
研究了基于体积布拉格光栅的光热折光玻璃二维角滤波器对纳秒激光脉冲的影响。实验结果表明，该方法有效地改善了激光脉冲的近场光束质量。近场调制和对比度分别提高了1.75倍和4.48倍。功率谱密度曲线表明，在x方向上大于0.9 mm−1的空间频率和在y方向上大于1.2 mm−1的空间频率被有效抑制。
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.