Liu Zhaohong, Wang Yulei, Wang Yirui, Li Sensen, Bai Zhenxu, Lin Dianyang, He Weiming, Lu Zhiwei
Opt Express. 2018 Mar 5;26(5):5701-5710. doi: 10.1364/OE.26.005701.
A new approach to sub-phonon lifetime pulse compression by stimulated Brillouin scattering (SBS) is presented. Triangular and step pulse pumps are both used as a pump source in a single-cell SBS compression setup. Compared with a Gaussian pump (shortest compressed pulse is the phonon lifetime with the highest energy conversion, approximately 60% under the same conditions), the compression ratio is significantly improved in the case of triangular and step pulse pumps, and there is some improvement in the energy conversion when a step pulse pump is used. A pulse as short as a quarter of a phonon lifetime is produced by a triangular pulse pump, with an energy conversion above 30%. The pump pulse shape is identified as the key parameter in achieving sub-phonon lifetime pulse compression. By using a step pulse shape, a 4.5 ns pump pulses with a 60mJ at 1064-nm are compressed down to 292 ps (below semi-phonon-lifetime) in 3M Fluorinert Electronic Liquid FC-770 with an energy conversion above 65%. This work presents a route to reliable generation of sub-semi-phonon-lifetime pulses by SBS compression.
提出了一种通过受激布里渊散射（SBS）实现亚声子寿命脉冲压缩的新方法。在单池SBS压缩装置中，三角脉冲泵浦和阶跃脉冲泵浦均用作泵浦源。与高斯泵浦（最短压缩脉冲为具有最高能量转换的声子寿命，在相同条件下约为60%）相比，三角脉冲泵浦和阶跃脉冲泵浦的压缩比显著提高，使用阶跃脉冲泵浦时能量转换也有一定改善。三角脉冲泵浦产生了短至四分之一声子寿命的脉冲，能量转换高于30%。泵浦脉冲形状被确定为实现亚声子寿命脉冲压缩的关键参数。通过使用阶跃脉冲形状，在3M氟化物电子液体FC - 770中，将1064 nm处能量为60 mJ的4.5 ns泵浦脉冲压缩至292 ps（低于半声子寿命），能量转换高于65%。这项工作为通过SBS压缩可靠地产生亚半声子寿命脉冲提供了一条途径。
