摘要
受激布里渊散射（ＳＢＳ）转换效率及相位共轭保真度的稳定性与泵浦脉冲的前沿上升时间有关，对前沿上升时间与介质声学声子寿命接近的泵浦脉冲，在泵浦能量超过受激布里渊散射阈值较多时，会造成严重的相位共轭保真度不稳定。本文针对上升前沿时间为２ｎｓ的泵浦脉冲及声学声子寿命约１ｎｓ的ＣＣｌ４介质，在泵浦脉冲前沿根部引人缓慢上升的小信号后，采用振放双池受激布里渊散射相位共轭镜，在泵浦激光能量达到５００倍受激布里渊散射阈值时，仍获得了稳定的受激布里渊散射，其转换效率起伏在４％以内。
The stability of stimulated Brillouin scattering (SBS) conversion efficiency and phase conjugation (PC) fidelity are mainly depend on the leading edge of pump pulse. If the rise time of the leading edge of the pump pulse is near to the acoustic phonon lifetime of SBS medium and pump energy is well over the SBS threshold, the SBS PC fidelity will become very unstable. For pump pulse with 2 ns leading edge and CCl 4 medium with about 1 ns acoustic phonon lifetime, when introduced a small slow rising signal at the front foot of the pump pulse′s leading edge , a stable SBS produced by two cell SBS PC mirror is obtained even for pump pulse energy exceeding 500 times SBS threshold. The fluctuation of the SBS conversion efficiency is within 4%, and that of the PC fidelity is within 5%.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1996年第10期1431-1436,共6页
Acta Optica Sinica
基金
国家高技术惯性约束聚变主题
国家自然科学基金
关键词
受激布里渊散射
相位共轭镜
相位共轭保真度
stimulated Brillouin scattering, phase conjugation mirror, phase conjugation fidelity.
