Bandwidth optimization of femtosecond pure-rotational coherent anti-Stokes Raman scattering by pump/Stokes spectral focusing

被引:20
|
作者
Kearney, Sean P. [1 ]
机构
[1] Sandia Natl Labs, Engn Sci Ctr, Albuquerque, NM 87185 USA
基金
美国能源部;
关键词
GAS-PHASE THERMOMETRY; SINGLE-LASER-SHOT; INTERFERENCE-FREE; RESOLUTION SPECTROSCOPY; CARS; TEMPERATURE; PROBE; FLAME; PULSES; SUPPRESSION;
D O I
10.1364/AO.53.006579
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A simple spectral focusing scheme for bandwidth optimization of gas-phase rotational coherent anti-Stokes Raman scattering (CARS) spectra is presented. The method is useful when femtosecond pump/Stokes preparation of the Raman coherence is utilized. The approach is of practical utility when working with laser pulses that are not strictly transform limited or when windows or other sources of pulse chirp may be present in the experiment. A delay between the femtosecond preparation pulses is introduced to shift the maximum Raman preparation away from zero frequency and toward the Stokes or anti-Stokes side of the spectrum with no loss in total preparation bandwidth. Shifts of 100 cm(-1) or more are attainable and allow for enhanced detection of high-energy (150-300 cm(-1)) rotational Raman transitions at near-transform-limited optimum sensitivity. A simple theoretical treatment for the case of identical pump and Stokes pulses with linear frequency chirp is presented. The approach is then demonstrated experimentally for typical levels of transform-limited laser performance obtained in our laboratory with nonresonant CARS in argon and Raman-resonant spectra from a lean H-2/air flat flame. (C) 2014 Optical Society of America
引用
收藏
页码:6579 / 6585
页数:7
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