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.

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