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Opt Express. 2009 Aug 17;17(17):14665-75.

Ti:sapphire, broadband vibrational sum-frequency generation spectrometer with a counter-propagating geometry.

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Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA.


We report the development of a counter-propagating, broadband vibrational sum-frequency generation spectrometer based on a Ti:sapphire regenerative amplifier. We present simple procedures for aligning the spectrometer and for setting the timing of the IR and visible pulses. We demonstrate that the use of this geometry offers a number of important advantages over a co-propagating geometry, including a high dynamic range, reduced nonresonant background signal at buried interfaces, and minimal beam deviation upon changing samples.

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