期刊
OPTICS EXPRESS
卷 19, 期 16, 页码 15627-15640出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.015627
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资金
- National Science Foundation [CBET-1056006]
- Air Force Office of Scientific Research
- Air Force Research Laboratory (AFRL) [FA8650-09-C-2918, FA8650-10-C-2008]
- National Defense Science and Engineering Graduate Fellowship Programs
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1056006] Funding Source: National Science Foundation
High-repetition-rate, single-laser-shot measurements are important for the investigation of unsteady flows where temperature and species concentrations can vary significantly. Here, we demonstrate single-shot, pure-rotational, hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps RCARS) thermometry based on a kHz-rate fs laser source. Interferences that can affect nanosecond (ns) and ps CARS, such as nonresonant background and collisional dephasing, are eliminated by selecting an appropriate time delay between the 100-fs pump/Stokes pulses and the pulse-shaped 8.4-ps probe. A time-and frequency-domain theoretical model is introduced to account for rotational-level dependent collisional dephasing and indicates that the optimal probe-pulse time delay is 13.5 ps to 30 ps. This time delay allows for uncorrected best-fit N-2-RCARS temperature measurements with similar to 1% accuracy. Hence, the hybrid fs/ps RCARS approach can be performed with kHz-rate laser sources while avoiding corrections that can be difficult to predict in unsteady flows. (c) 2011 Optical Society of America
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