We propose a method that utilizes optimized probe time delays of 10–35 ps in hybrid femtosecond/picosecond (fs/ps) vibrational coherent anti-Stokes Raman scattering thermometry and obtains maximum temperature sensitivity from 300 to 2500 K. The relationship between temperature sensitivity and the optimal probe time delay can be approximated by a power function. Sensitive measurements at flame temperatures (1700–2100 K) using optimal time delays are performed in further experiments where the Raman coherence of nitrogen molecules is excited by 35-fs pump and Stokes pulses and probed with a spectrally narrow pulse generated from a 4-f pulse shaper. Temperature results at optimal time delays exhibit state-of-the-art accuracy and superior uncertainty, demonstrating its capability to achieve sensitive measurements.

中文翻译：

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使用优化的探针时间延迟的灵敏混合飞秒/皮秒振动相干反斯托克斯拉曼散射测温

我们提出了一种方法，该方法在混合飞秒/皮秒 (fs/ps) 振动相干反斯托克斯拉曼散射测温中利用 10–35 ps 的优化探针时间延迟，并在 300 到 2500 K 范围内获得最大温度灵敏度。最佳探测时间延迟可以通过幂函数近似。在进一步的实验中使用最佳时间延迟在火焰温度 (1700–2100 K) 下进行灵敏测量，其中氮分子的拉曼相干性由 35-fs 泵浦和斯托克斯脉冲激发，并用由 4-f 产生的光谱窄脉冲探测脉冲整形器。最佳时间延迟下的温度结果显示出最先进的精度和卓越的不确定性，证明了其实现灵敏测量的能力。