Abstract
We have constructed a multiplex infrared-visible sum-frequency (SF) spectrometer. Picosecond narrow-bandwidth visible laser light (full width at half-maximum (FWHM) ∼8 cm−1, 400 nm) was obtained by sum-frequency mixing of a pair of phase-conjugated broad-bandwidth pulses generated from femtosecond laser light (∼110 fs, 800 nm). Femtosecond broad-band infrared laser light (FWHM ∼280 cm−1, 3.4 μm) was obtained as a difference frequency mixing output of the signal and idler lights of an optical parametric amplifier pumped by the femtosecond laser light. Broad-bandwidth sum-frequency signal light (FWHM ∼280 cm−1) was generated by focusing the broad-bandwidth femtosecond infrared laser light and the narrow-bandwidth picosecond visible laser light onto a sample surface. The generated light was dispersed by a spectrograph and analyzed with a multichannel detector. An SF spectrum with a high signal-to-noise ratio over a 400 cm−1 spectral region with an ∼8 cm−1 resolution was obtained from an octadecanethiol self-assembled monolayer with a 60 s exposure time.
Published Version
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