Del Mar Photonics

Ti : Sapphire-Based Picosecond Visible-Infrared Sum-Frequency Spectroscopy from 9003100 cm-1
Authors: Dennis K. Hore; Jennifer L. King; Fred G. Moore; David S. Alavi; Mathew Y. Hamamoto; Geraldine L. Richmond

Source: Applied Spectroscopy, Volume 58, Number 12, December 2004 , pp. 1377-1384(8)
Publisher: Society for Applied Spectroscopy


Visible-infrared sum-frequency spectroscopy is ideally suited to the study of surfaces and interfaces. This paper introduces new sum-frequency spectroscopy instrumentation that we have developed with two novel features: (1) stable and robust infrared generation in the 9003100 cm-1 (113.2 m) region using an amplified Ti : sapphire oscillator with a home-built OPG/OPA, and (2) continuous tuning over either 9002700 cm-1 (113.7 m) or 18003100 cm-1 (5.53.2 m) in a single experiment. All practical details of baseline correction issues due to the picosecond pulses (including variation in infrared (IR) energy, spatial and temporal overlap, Fresnel co- efficients) are addressed while demonstrating signal throughout this region from an amorphous gold surface. A sum-frequency spectrum from an oriented polymer is shown as a complete example of the data treatment, which reveals the vibrational modes accessible in this wavelength region.



Del Mar Connection: Dennis Hore is Del Mar Photonics customer. His recent order includes variety of special prisms from ZnSe and other materials, such as hemicylindrical ZnSe prisms

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