Li Hongwei, Chang Ning, Zhang Hongying, Wang Bo, Gao Wei, Zhu Zhihan
Appl Opt. 2017 Jul 10;56(20):5745-5750. doi: 10.1364/AO.56.005745.
We propose and demonstrate a modified frequency sweep-free pump-probe technique, called staring pump-probe technique (SPPT) for Brillouin signal measurement based on stimulated Brillouin scattering (SBS). The SPPT retains the advantages of conventional pump-probe technique, and employs a simple device and low-cost measurement system. Moreover, the Brillouin gain/loss spectrum (BGS/BLS) can be reconstructed without frequency-sweep, thus greatly improving the measurement speed. In this paper, an approximate flat-top spectrum broadened probe light is introduced through distributed feedback laser by direct modulation. The BGS/BLS is reconstructed with the enhanced signal-noise ratio of approximately 21 dB/23 dB. This technique has a potential application for some Brillouin scattering involved Brillouin frequency shift measurement.
我们提出并演示了一种改进的无频率扫描泵浦-探测技术，称为凝视泵浦-探测技术（SPPT），用于基于受激布里渊散射（SBS）的布里渊信号测量。SPPT保留了传统泵浦-探测技术的优点，并采用了简单的装置和低成本的测量系统。此外，无需频率扫描即可重建布里渊增益/损耗谱（BGS/BLS），从而大大提高了测量速度。在本文中，通过直接调制分布式反馈激光器引入了近似平顶谱展宽的探测光。以大约21 dB/23 dB的增强信噪比重建了BGS/BLS。该技术在一些涉及布里渊频移测量的布里渊散射方面具有潜在应用。
