A full-path phasing technique based on the far-field interference fringe for tiled-aperture coherent beam combining. (31st August 2018)

• Record Type: Journal Article
• Authors: Peng, Chun; Liu, Renqi; Wu, Weishu; Li, Wenqi; Liang, Xiaoyan; Li, Ruxin
• Is Part Of: Laser physics letters. Volume 15:Number 10(2018:Oct.)
• Publication Date: 2018-08-31
• Subjects: ultrafast lasers -- coherent beam combining -- active or adaptive optics; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aadaaf
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We propose a new phase error measurement and control technique based on the far-field interference fringe (FFIF) for a coherent beam combined with a tiled-aperture design. By using this method, the phase error can be directly measured at the focal plane, enabling a visual monitor of full-path measurement without introducing extra optical elements before focusing. The analytical expression of the relation between far-field distributions and phase errors is derived, which gives a theory guidance by the phase extraction from the FFIF. A proof of the principle experiment is demonstrated and a residual phase jitter of 0.157 rad (approximately 1/40 λ ) is achieved, which is adequate for a coherent beam combined with femtosecond pulses.