Simultaneous detection of resonant and non-resonant femtosecond/picosecond coherent anti-Stokes Raman spectroscopy (CARS) signals has been developed as a viable technique to provide in-situ referencing of the impulsive excitation efficiency for temperature assessments in flames. In the framework of CARS thermometry, the occurrence of both a resonant and a non-resonant contribution to the third-order susceptibility is well known. While the resonant part conceives the useful spectral information for deriving temperature and species concentrations in the probed volume, the non-resonant part is often disregarded. It nonetheless serves the CARS technique as an essential reference to map the finite bandwidth of the laser excitation fields and the transmission characteristics of the signal along the detection path. Hence, the standard protocols for CARS flame measurements include the time-averaged recording of the non-resonant signal, to be performed sequentially to the experiment. In the present work we present the successful single-shot recordings of both the resonant and non-resonant CARS signals, split on the same detector frame, realizing the in-situ referencing of the impulsive excitation efficiency. We demonstrate the use of this technique on one-dimensional CARS imaging spectra, acquired across the flame front of a laminar premixed methane/air flame. The effect of pulse dispersion on the laser excitation fields, while propagating in the participating medium, is proved to result, if not accounted for, in an ∼1.3% systematic bias of the CARS-evaluated temperature in the oxidation region of the flame.

同时检测共振和非共振飞秒/皮秒相干反斯托克斯拉曼光谱（CARS）信号是一种可行的技术，可提供原位参考脉冲激励效率来评估火焰中的温度。在CARS测温的框架中，众所周知的是，对三阶磁化率的共振和非共振均会发生。尽管谐振部分会考虑到有用的光谱信息，以得出所探测体积中的温度和物质浓度，但非谐振部分通常被忽略。尽管如此，它仍将CARS技术用作绘制激光激发场的有限带宽和信号沿检测路径的传输特性的必要参考。因此，用于CARS火焰测量的标准协议包括非共振信号的时间平均记录，将在实验后顺序执行。脉冲激励效率的现场参考。我们展示了在层状预混合甲烷/空气火焰的火焰前沿采集的一维CARS成像光谱中使用此技术的情况。脉冲色散对激光激发场的影响，尽管在未考虑的情况下在参与介质中传播，但事实证明，如果不考虑这些因素，火焰氧化区域中CARS评估温度的系统偏差约为1.3％。