Abstract
We report spatiotemporal pure-rotational coherent anti-Stokes Raman spectroscopy (CARS) in a one-dimensional imaging arrangement obtained with a single ultrafast regenerative amplifier system. The femtosecond pump/Stokes photon pairs, used for impulsive excitation, are delivered by an external compressor operating on a ${\sim}{35}\%$ beam split of the uncompressed amplifier output (2.5 mJ/pulse). The picosecond 1.2 mJ probe pulse is produced via the second-harmonic bandwidth compression (SHBC) of the ${\sim}{65}\%$ remainder of the amplifier output (4.5 mJ/pulse), which originates from the internal compressor. The two pump/Stokes and probe pulses are spatially, temporally, and repetition-wise correlated at the measurement, and the signal generation plane is relayed by a wide-field coherent imaging spectrometer onto the detector plane, which is refreshed at the same repetition rate as the ultrafast regenerative amplifier system. We demonstrate 1 kHz cinematographic 1D-CARS gas-phase thermometry across an unstable premixed methane/air flame-front, achieved with a single-shot precision ${\lt}{1}\%$ and accuracy ${\lt}{3}\%$, 1.4 mm field of view, and an excellent ${\lt}{20}\;{\unicode{x00B5}{\rm m}}$ line-spread function.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Timothy Y. Chen, Ning Liu, Christopher J. Kliewer, Arthur Dogariu, Egemen Kolemen, and Yiguang Ju
Opt. Lett. 47(6) 1351-1354 (2022)
Timothy Y. Chen, Benjamin M. Goldberg, Brian D. Patterson, Egemen Kolemen, Yiguang Ju, and Christopher J. Kliewer
Opt. Lett. 45(15) 4252-4255 (2020)
David Escofet-Martin, Anthony O. Ojo, Joshua Collins, Nils Torge Mecker, Mark Linne, and Brian Peterson
Opt. Lett. 45(17) 4758-4761 (2020)