Nanosecond double-pulse fiber laser with arbitrary sub-pulse combined based on a spectral beam combining system. (1st May 2017)

• Record Type: Journal Article
• Authors: Hu, Man; Zheng, Ye; Yang, Yifeng; Chen, Xiaolong; Liu, Kai; Zhao, Chun; Wang, Jianhua; Qi, Yunfeng; He, Bing; Zhou, Jun
• Is Part Of: Optics & laser technology. Volume 90(2017)
• Page Start: 22
• Page End: 26
• Publication Date: 2017-05-01
• Subjects: Double-pulse technique -- Tunable pulse amplifier -- Spectral beam combining -- Laser processing; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2016.10.017
• Languages: English
• ISSNs: 0030-3992

Abstract

Abstract: In order to improve the processing efficiency and quality of nanosecond pulse laser drilling, a new double-pulse technique is put forward. Two single pulse lasers with different pulse duration or different repetition rate are spectrally combined by a home-made polarization-independent multilayer dielectric reflective diffraction grating. The pulse energy of single lasers and the inter-pulse separation can both be set at one's option. Then, double-pulse lasers represent two closely conjoint pulses with tunable pulse duration and tunable repetition rate and tunable pulse energy and tunable inter-pulse separation are obtained. Highlights: A spectral beam combining system based on a MLD diffraction grating is established. Three typical double-pulse lasers with arbitrary sub-pulse shapes are obtained. The inter-pulse separation of each double-pulse laser can be set at random. Several-pulse laser with more sub-pulses can be realized in this system.