Band-stop angular filtering with hump volume Bragg gratings. (30th April 2019)

• Record Type: Journal Article
• Authors: Gao, Fan; Wang, Xin; Yu, Tiancheng; Zhang, Xiang; Yuan, Xiao
• Is Part Of: High power laser science and engineering. Volume 7(2019)
• Publication Date: 2019-04-30
• Subjects: holographic optical elements, -- self-focusing, -- spatial filtering, -- volume gratings; High power lasers -- Periodicals; 621.366
• DOI: 10.1017/hpl.2019.12
• Languages: English
• ISSNs: 2095-4719

Abstract

Abstract : A band-stop angular filter (BSF) based on hump volume Bragg gratings (HVBGs) is proposed. Band-stop filtering in a two-stage amplifier laser system is discussed and simulated. Simulation results show that small-scale self-focusing effects in the laser system can be effectively suppressed with the BSF due to the control of fast nonlinear growth in a specific range of spatial frequencies in the laser beam. Near-field modulation of the output beam from the laser system was decreased from 2.69 to 1.37 by controlling the fast nonlinear growth of spatial frequencies ranging from $0.6~\text{mm}^{-1}$ to $1.2~\text{mm}^{-1}$ with the BSF. In addition, the BSF can be used in a plug-and-play scheme and has potential applications in high-power laser systems.