Snelling D R, Smallwood G J, Sawchuk R A, Parameswaran T
Appl Opt. 1987 Jan 1;26(1):99-110. doi: 10.1364/AO.26.000099.
The noise level in single-pulse resonant nitrogen CARS spectra is shown to decrease with increasing pump laser bandwidth. This is the reverse of the trend observed for nonresonant CARS spectra. The precision of single-pulse CARS temperature measurements is shown to be dramatically increased by performing a weighted fit of theoretical and experimental CARS spectra using the measured detector noise coefficients as weighting parameters. The inclusion of collisional narrowing and cross-coherence in the CARS theory calculations and their effect on best fit temperatures are discussed. These temperatures, measured in a flat-flame burner, are compared with those obtained by Na line-reversal.
单脉冲共振氮CARS光谱中的噪声水平显示出随着泵浦激光带宽的增加而降低。这与非共振CARS光谱中观察到的趋势相反。通过使用测量的探测器噪声系数作为加权参数对理论和实验CARS光谱进行加权拟合，单脉冲CARS温度测量的精度显著提高。讨论了在CARS理论计算中包含碰撞变窄和交叉相干及其对最佳拟合温度的影响。将在扁平火焰燃烧器中测量的这些温度与通过钠线反转获得的温度进行比较。
