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Proceedings Paper

High-spectral-resolution multiplex CARS spectroscopy using chirped pulses
Author(s): Kelly P. Knutsen; Justin C. Johnson; Abigail E. Miller; Poul B. Petersen; Richard James Saykally
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Paper 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 (ωP) and probe (ωp) pulse for the CARS experiment. When overlapped in time with the 1050 nm, 90 fs transform-limited Stokes (ωS) pulse, only a fraction of the chirped ωp 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 ωS wavelength and ωp delay relative to the ωS pulse.

Paper Details

Date Published: 21 June 2004
PDF: 10 pages
Proc. SPIE 5323, Multiphoton Microscopy in the Biomedical Sciences IV, (21 June 2004); doi: 10.1117/12.527830
Show Author Affiliations
Kelly P. Knutsen, Univ. of California/Berkeley (United States)
Justin C. Johnson, Univ. of California/Berkeley (United States)
Abigail E. Miller, Univ. of California/Berkeley (United States)
Poul B. Petersen, Univ. of California/Berkeley (United States)
Richard James Saykally, Univ. of California/Berkeley (United States)

Published in SPIE Proceedings Vol. 5323:
Multiphoton Microscopy in the Biomedical Sciences IV
Ammasi Periasamy; Peter T. C. So, Editor(s)

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