Simplified setup for high-resolution spectroscopy that uses ultrashort pulses
Date
2003
Authors
Kapteyn, H. C., author
Murnane, M. M., author
Tobey, R., author
Fourkas, J. T., author
Bartels, R. A., author
Gershgoren, E., author
Optical Society of America, publisher
Journal Title
Journal ISSN
Volume Title
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.