Ti : Sapphire-Based Picosecond Visible-Infrared Sum-Frequency Spectroscopy
from 900–3100 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
Abstract:
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 900–3100 cm-1 (11–3.2 m) region using an
amplified Ti : sapphire oscillator with a home-built OPG/OPA, and (2) continuous
tuning over either 900–2700 cm-1 (11–3.7 m) or 1800–3100 cm-1 (5.5–3.2 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.
Keywords: MID-INFRARED; TI : SAPPHIRE; PICOSECOND; SUM-FREQUENCY SPECTROSCOPY
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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