Journal
OPTICS LETTERS
Volume 29, Issue 8, Pages 884-886Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.29.000884
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We have developed a two-dimensional (M) Fourier-transform femtosecond spectroscopy technique for the visible spectral region. Three-pulse photon echo signals are generated in a phase-matched noncollinear four-wave mixing box geometry that employs a 3-kHz repetition-rate laser system and optical parametric amplification. Nonlinear signals are fully characterized in amplitude and phase by spectral interferometry. Unlike for previous setups, we achieve long-term phase stability by employing diffractive optics and interferometric accuracy of excitation-pulse time delays by using movable glass wedges. As an example of this technique, 2D correlation and relaxation spectra at 600 nm are shown for a solution of Nile Blue dye in acetonitrile. (C) 2004 Optical Society of America.
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