Abstract

A comparison between the use of the fringe-side and the frequency-modulation methods to frequency stabilize diode-pumped Tm-Ho:YAG lasers against linear absorption lines of CO2 near 2.1 µm is reported. Frequency stability was evaluated by monitoring of the beat signal between two independently stabilized Tm-Ho:YAG systems. Frequency instability levels of 20 and 400 kHz for 1-s integration time were achieved by the frequency-modulation and fringe-side methods, respectively.

© 2003 Optical Society of America

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