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

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 15-18
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201917.040501

摘要

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.