title: Simplified setup for high-resolution spectroscopy that uses ultrashort pulses.
abstract: Using a broadband femtosecond laser and a simple optical setup, we demonstrate narrow-bandwidth-tunable excitation of vibrational modes in CCl4 and CHBr3 liquids. The resolution obtained is 80 times higher than the laser bandwidth. A pair of time-shifted, linearly chirped pulses is created by use of a high-order dispersion-compensated prism-interferometer setup. We use this pulse pair to selectively excite Raman-active transitions. Our setup represents a significant simplification with improved resolution, of previous approaches to the use of ultrashort pulses for chemically selective spectroscopy.
authors.affiliation: JILA, University of Colorado, Boulder, Colorado 80309-0440, USA.
authors.forename: E
authors.initials: E
authors.lastname: Gershgoren
authors.forename: R A
authors.initials: RA
authors.lastname: Bartels
authors.forename: J T
authors.initials: JT
authors.lastname: Fourkas
authors.forename: R
authors.initials: R
authors.lastname: Tobey
authors.forename: M M
authors.initials: MM
authors.lastname: Murnane
authors.forename: H C
authors.initials: HC
authors.lastname: Kapteyn