Memoirs of the Faculty of Engineering, Okayama University
Published by Faculty of Enginerring, Okayama University

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Memoirs of the School of Engineering, Okayama University

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Improvement of Etalon-fringe Immunity in Diode-laser Derivative Spectroscopy

Koga, Ryuji Department of Electronics
Kosaka, Megumi Department of Electronics
Sano, Hiroya Department of Electronics
In a sensitive spectrometry with lead-salt diode lasers, etalon-fringe phenomena often intervene in the measured absorption spectrum. Derivative methods are employed for the purpose of high resolution where the pertaining wavelength is modulated. This paper presents results of mathematical examination on a possible improvement of immunity from the etalon-fringes by choosing the profile of the wavelength modulation.