Generation and application of high power femtosecond pulses in the vibrational fingerprint region

We present a novel high power femtosecond infrared laser source, based on a three-stage chirped-pulse amplification scheme. Owing to the high power output of the Ti:sapphire amplifiers, it becomes routinely possible to produce femtosecond infrared laser pulses in the wavelength region of 2.6-20 μm with minimum pulse energies of 15 μJ, to our knowledge roughly an improvement of an order of magnitude. With such pulses we have performed femtosecond second-order nonlinear optical surface spectroscopy in the fingerprint region. We have probed the skeletal modes of the first few monolayers of a polymer/air interface in a femtosecond vibrational sum frequency generation experiment. This development opens up new possibilities to investigate surface structures and dynamics of, e.g., organo-metallic compounds, proteins, and peptides.

Published in:
Applied Physics B: Lasers and Optics, 91, 2, 315-318
Other identifiers:
Scopus: 2-s2.0-42649134494

 Record created 2013-02-08, last modified 2018-03-17

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