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Updated: Feb 2, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization
Published on: December 11, 2014
Optical saturation effects in intracavity Faraday modulation spectroscopy (INFAMOS)
Tomás H P Pinto1, Michele Gianella1, Grant A D Ritchie1
1Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom.
Abstract:
We report on the observation of saturation effects in Intracavity Faraday Modulation Spectroscopy (INFAMOS). A quantum cascade laser operating at ∼5.3 μm is used to probe the 2Π3/2 and 2Π1/2 R(3.5) transitions in the fundamental band of nitric oxide. With average intracavity intensities up to 450 W cm-2, the saturation of these molecular transitions is observed up to a total pressure of ∼240 Torr. The experimental data are interpreted by incorporating saturation into a model for the INFAMOS line shape in the homogeneously broadened limit.
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