瞬态SBS光纤相位共轭镜的低重复频率运转特性

Operating Characteristic of Instantaneous SBS Fiber Phase Conjugation Mirror at Lower Repetition Rate

由于光纤中的声子寿命极短,已有的工作大都采用连续波或长脉冲激光作为泵浦源,所激发的受激布里渊散射(SBS)工作在稳态区。实验研究了采用光纤中的瞬态受激布里渊散射作为位相共轭镜的MOPA(master oscillator power amplifier)系统在低重复频率和不同泵浦能量下的输出特性,并与纯丙酮相位共轭镜进行了对比。结果显示:光纤相位共轭镜对重复运转频率(≤15Hz)的变化不敏感,保真度较高;同时,光纤中的瞬态SBS也能实现有效的脉宽压缩。这意味着光纤共轭镜在短脉冲区也有着潜在的应用前景,并有望成为短脉冲区液体、气体共轭镜的更好的替代品。

In most earlier experimental, CW or long pulse laser was served as pumping radiation, and it resulted in a steady-state excitement of stimulated Brillouin scattering (SBS) in fiber since the life of phonon in fiber was very short. The output characteristic of MOPA (master-oscillator-power-amplifier) system with fiber phase-conjugation mirror operating at lower repetition rate and pumped with different pump energy, was experimentally investigated and compared with that of acetone phase-conjugation mirror. It was showed that the fiber phase-conjugation mirror was not sensitive to the change of repetition rate (&le15 Hz) and its fidelity was better than that of acetone; meanwhile, the pulse-width could be compressed effectively under instantaneous conditions. This means that fiber phase-conjugation mirror in the range of short pulse has also potential and applied outlook, and one can hope it become a better replacer of liquids and gases mirror when they were pumped by short pulses.