Abstract
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 ( p ) and probe ( p' ) pulse for the CARS experiment. When overlapped in time with the 1050 nm, 90 fs transform-limited Stokes ( S ) pulse, only a fraction of the chirped 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 S wavelength and p delay relative to the S pulse. Keywords: Coherent Anti-Stokes Raman Scattering (CARS), chirp, multiplex
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