Modelocked cavity--enhanced absorption spectroscopy
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Updated: Jun 23, 2026

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
Published on: April 28, 2023
Abstract:
We demonstrate the principle of cavity enhanced absorption with femtosecond modelocked lasers. The wide spectral coverage allowed by these sources makes this a promising high-sensitivity linear absorption technique. The uniformity of the modelocked frequency comb is the feature allowing effective injection of a high finesse cavity. The smooth and stable laser spectral profile guarantees a good background for the intracavity sample absorption spectrum, recorded by a spectrograph and a linear detector array. With a modelocked Ti:Sa laser and a cavity of finesse F 420 (F/pi is the enhancement factor) we obtain a 4nm section of a weak overtone band in 40 ms with 0.2 cm-1resolution,a nd a detection limit of 2x10-7/cm/ radicalHz.
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