Snelling D R, Sawchuk R A, Mueller R E
Defence Research Establishment Ottawa, Energy Conversion Division, Ottawa, Ontario KlA 0Z4.
Appl Opt. 1985 Sep 1;24(17):2771-8. doi: 10.1364/ao.24.002771.
An investigation of single pulse coherent anti-Stokes Raman spectroscopy (CARS) noise, determined by the analysis of broadband nonresonant spectra, is described. It is shown that the use of a single-mode rather than a multimode pump laser leads to a significant reduction of CARS noise (40%), down to the level exhibited by the Stokes spectral profile itself. This reduction in noise is attributed to the minimization of the effects due to random variations in the laser temporal profiles by using temporally smooth single-mode laser pumps. A measurement of detector shot noise is presented and its effect on CARS noise is described. The advantages of using a single-mode pump laser in CARS spectroscopy are discussed.
本文描述了通过对宽带非共振光谱进行分析来研究单脉冲相干反斯托克斯拉曼光谱（CARS）噪声的情况。结果表明，使用单模泵浦激光器而非多模泵浦激光器可使CARS噪声显著降低（40%），降至斯托克斯光谱轮廓本身所呈现的水平。噪声的这种降低归因于通过使用时间上平滑的单模激光泵浦，将激光时间轮廓随机变化所产生的影响降至最低。文中给出了探测器散粒噪声的测量结果，并描述了其对CARS噪声的影响。还讨论了在CARS光谱学中使用单模泵浦激光器的优势。
