外文题目: Beam modulation due to thermal deformation of grating in a spectral beam combining system
作者: Li, Linxin; Jin, Yunxia; Kong, Fanyu; Wang, Leilei; Chen, Junming; Shao, Jianda
刊名: Appl. Optics
年: 2017 卷: 56 期: 19 页： 5511--5519
英文关键词:

VOLUME BRAGG GRATINGS; AVERAGE-POWER; HIGH-EFFICIENCY; FIBER LASERS; COMPENSATION; QUALITY; ARRAY; KW
英文摘要:
As the power of a spectral beam combining (SBC) system increases, the temperature of the multilayer dielectric grating (MDG) inevitably rises under the influence of high-power continuous-wave (CW) laser irradiation. Hence, thermal deformation of the MDG occurs, along with degeneration of the combined beam properties. In this study, we experimentally and theoretically investigate the influence of the MDG thermal deformation on the combined beam properties. An experimental setup is first proposed, in which beam quality M-2, beam profile, and MDG wavefront deformation are investigated. The experimental results indicate that the beam quality clearly degrades and the MDG wavefront deformation becomes more significant with increasing pump-CW power density. On this basis, a calculation model for MDG thermal deformation in SBC systems is proposed. The results indicate that MDG wavefront deformation becomes more significant, combined beam profile becomes deformed, and beam quality of the combined beam degrades with increasing power density. Further, thermal expansion of the substrate is a crucial factor that induces MDG wavefront deformation and far-field intensity modulation. .


文献类型: 期刊论文
正文语种: English
收录类别: SCI
DOI: 10.1364/AO.56.005511


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