Generation and application of high power femtosecond pulses in the vibrational fingerprint region |
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Authors: | AB Sugiharto CM Johnson HB de Aguiar L Alloatti S Roke |
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Institution: | (1) Max Planck Institute for Metals Research, Heisenbergstrasse 3, 70569 Stuttgart, Germany |
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Abstract: | 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.
PACS 42.65.-k; 68.35.-Ja; 82.35.Ps |
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