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首页> 外文期刊>Optics Letters >Dual-pump vibrational/rotational femtosecond/picosecond coherent anti-Stokes Raman scattering temperature and species measurements
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Dual-pump vibrational/rotational femtosecond/picosecond coherent anti-Stokes Raman scattering temperature and species measurements

机译：双泵振动/旋转飞秒/皮秒相干反斯托克斯拉曼散射温度和物质测量

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摘要

A method for simultaneous ro-vibrational and pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) is presented for multi-species detection and improved temperature sensitivity from room temperature to flame conditions. N-2/CH4 vibrational and N-2/O-2/H-2 rotational Raman coherences are excited simultaneously using fs pump pulses at 660 and 798 nm, respectively, and a common fs Stokes pulse at 798 nm. A fourth narrowband 798 nm ps pulse probes all coherence states at a time delay that minimizes nonresonant background and the effects of collisions. The transition strength is concentration dependent, while the distribution among observed transitions is related to temperature through the Boltzmann distribution. The broadband excitation pulses and multiplexed signal are demonstrated for accurate thermometry from 298 to 2400 K and concentration measurements of four key combustion species. (C) 2014 Optical Society of America
机译：提出了一种同时进行旋转振动和纯旋转混合飞秒/皮秒相干反斯托克斯拉曼散射（fs/ps CARS）的方法，用于多物种检测和提高室温到火焰条件下的温度灵敏度。N-2/CH4振动和N-2/O-2/H-2旋转拉曼相干性分别使用660和798 nm处的fs泵浦脉冲和798 nm处的公共fs Stokes脉冲同时激发。第四个窄带 798 nm ps 脉冲以时间延迟探测所有相干状态，从而最大限度地减少非谐振背景和碰撞的影响。转变强度与浓度有关，而观测到的转变之间的分布通过玻尔兹曼分布与温度相关。演示了宽带激励脉冲和多路复用信号，用于 298 至 2400 K 的精确温度测量和四种关键燃烧物质的浓度测量。（C） 2014年美国光学学会

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