High-spectral-resolution multiplex CARS spectroscopy using chirped pulses

Kelly P. Knutsen; Justin C. Johnson; Abigail E. Miller; Poul B. Petersen; Richard James Saykally

doi:10.1117/12.527830

21 June 2004 High-spectral-resolution multiplex CARS spectroscopy using chirped pulses

Kelly P. Knutsen, Justin C. Johnson, Abigail E. Miller, Poul B. Petersen, Richard James Saykally

Proceedings Volume 5323, Multiphoton Microscopy in the Biomedical Sciences IV; (2004) https://doi.org/10.1117/12.527830
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

Abstract

A novel technique for achieving high spectral resolution with a femtosecond laser system is presented. Transform-limited 800 nm, 90 femtosecond (fs) pulses pass off two gratings, stretching the pulse in time to a pulse width of several picoseconds due to an induced linear temporal chirp directly proportional to the grating separation. This chirped pulse is the degenerate pump (ω_P) and probe (ω_p) pulse for the CARS experiment. When overlapped in time with the 1050 nm, 90 fs transform-limited Stokes (ω_S) pulse, only a fraction of the chirped ω_p pulse generates the CARS signal, thereby creating a temporal slit that defines the spectral resolution of the technique. Spectra for liquid methanol and liquid isooctane are presented, with ~6 cm^-1 spectral resolution achieved for isooctane. Resonance enhancement and the mechanism of achieving high spectral resolution are shown by adjusting the ω_S wavelength and ω_p delay relative to the ω_S pulse.

Citation Download Citation

Kelly P. Knutsen, Justin C. Johnson, Abigail E. Miller, Poul B. Petersen, and Richard James Saykally "High-spectral-resolution multiplex CARS spectroscopy using chirped pulses", Proc. SPIE 5323, Multiphoton Microscopy in the Biomedical Sciences IV, (21 June 2004); https://doi.org/10.1117/12.527830

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