Open AccessResearch of coherence between driven-laser beams and its influence on backscatter
Author(s) -
Meng Xiang-Fu,
Wang Chen,
An Hong-Hai,
Jia Guo,
Fang Zhi-Heng,
Zhou Hua-zhen,
Jihong Sun,
Wei Wang,
Fu Si-Zu
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.185202
Subject(s) - laser , optics , backscatter (email) , brillouin scattering , coherence (philosophical gambling strategy) , coherent backscattering , physics , beam (structure) , laser beams , plasma , scattering , raman scattering , raman spectroscopy , materials science , nuclear physics , telecommunications , quantum mechanics , computer science , wireless
Previous studies have shown that the technology of beam smoothing may effectively control parameter instabilities within the laser-plasma interaction, and greatly reduce stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS). However, the recent experimental results on NIF revealed a much higher SBS and SRS than expected, one possible reason is due to the coherence between incident laser beams. In our research, two laser beams from Shenguang II facility are employed to irradiate an Au plate target, the energy and spectra of the backscattered light are measured in different coherent conditions. The results show that the driven-laser beams strongly interfere with each other, and usually the backscatter becomes strong gradually with the increase of coherent degree between the incident beams.