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首页> 外文期刊>Applied optics >High-resolution broadband N_(2) coherent anti-Stokes Raman spectroscopy: comparison of measurements for conventional and modeless broadband dye lasers
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High-resolution broadband N_(2) coherent anti-Stokes Raman spectroscopy: comparison of measurements for conventional and modeless broadband dye lasers

机译：高分辨率宽带N_（2）相干反斯托克斯拉曼光谱：常规和无模宽带染料激光器的测量比较

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摘要

We have performed high-resolution N_(2) coherent anti-Stokes Raman spectroscopy (CARS) measurements using a modeless dye laser (MDL) as the Stokes beam source to determine the effects of a reduction in mode noise on the accuracy and precision of the method. These results are compared with previous research that employed a conventional broadband dye laser (CBDL) as the Stokes beam source. A new spectral-fitting procedure was developed to avoid starting-point bias in the least-squares fitting results, which possibly had altered the previous measurements. Single-shot measurements of pressure were performed in a static-pressure vessel over the range of 0.1-4.0 atm to examine the pressure sensitivity of the technique. The precision of these measurements is a measure of the baseline noise level of the system, which sets the detection limit for flow-field pressure fluctuations. Centerline measurements of pressure and temperature in an underexpanded jet (M_(j)=1.85) were also used to determine the performance of the technique in a compressible flow field. Our study represents the first known application, to our knowledge, of a MDL CARS system in a low-temperature, low-pressure supersonic environment. Improvements in accuracy for mean single-shot measurements and increased precision were found for pressure vessel conditions above 1.0 atm. For subatmospheric pressure vessel conditions (0.1-1.0 atm) and the underexpanded jet measurements, there was a decrease in accuracy and precision compared with the CBDL results. A comparison with the CBDL study is included, along with a discussion of the MDL system behavior.
机译：我们已经使用无模式染料激光（MDL）作为斯托克斯束源进行了高分辨率N_（2）相干反斯托克斯拉曼光谱（CARS）测量，以确定模式噪声降低对噪声的准确性和精度的影响。方法。将这些结果与采用传统宽带染料激光器（CBDL）作为斯托克斯束源的先前研究进行了比较。开发了一种新的光谱拟合程序，以避免最小二乘拟合结果中的起始点偏差，这可能会改变以前的测量结果。在静压容器中在0.1-4.0 atm的压力范围内进行单次压力测量，以检查该技术的压力敏感性。这些测量的精度是对系统基线噪声水平的一种度量，它确定了流场压力波动的检测极限。扩径射流（M_（j）= 1.85）中压力和温度的中心线测量也用于确定该技术在可压缩流场中的性能。就我们所知，我们的研究代表了MDL CARS系统在低温，低压超声环境中的第一个已知应用。对于高于1.0 atm的压力容器条件，发现平均单次测量的精度有所提高，并且精度有所提高。对于低于大气压的容器条件（0.1-1.0 atm）和喷射量不足的情况，与CBDL结果相比，准确性和精密度都有所下降。包括与CBDL研究的比较，以及对MDL系统行为的讨论。

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