Abstract
This paper describes an instrument capable of studying diffuse reflection of mid-infrared (mid-IR) photons on ultrafast time scales. Femtosecond mid-IR pulses are generated by difference frequency mixing the output of an optical parametric amplifier that is pumped using a regeneratively amplified Ti:Sapphire laser. Time resolution is achieved by up-converting the diffusely reflected photons with pulses from the Ti:Sapphire oscillator. Experiments were performed on a series of powdered KBr samples containing varying amounts of carbon black. The results suggest that diffusely reflected mid-IR photons fall into two distinct categories. A small fraction of the photons travel relatively long effective path lengths (1.3–2.3 mm), while the majority traverse a much shorter distance (0.2–0.05 mm).
Keywords
InfraredUltrashort pulseDiffuse reflectionReflection (computer programming)OpticsDiffuse reflectance infrared fourier transformMaterials scienceChemistryPhysicsComputer scienceLaser
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Publication Info
- Year
- 2014
- Type
- article
- Volume
- 68
- Issue
- 1
- Pages
- 1-4
- Citations
- 7
- Access
- Closed
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Cite This
Eric B. Brauns
(2014).
Mid-Infrared Diffuse Reflection on Ultrafast Time Scales.
Applied Spectroscopy
, 68
(1)
, 1-4.
https://doi.org/10.1366/13-07258
Identifiers
- DOI
- 10.1366/13-07258