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Simultaneous observation of CO isotopomer absorption by broadband difference-frequency generation using a direct-bonded quasi-phase-matched Li Nb O 3 waveguide

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Abstract

Rovibration absorption lines both of C12O and C13O are observed simultaneously with the output of a 2μm broadband difference frequency generated in a direct-bonded quasi-phase-matched LiNbO3 waveguide, which is a 50 mm device with a single quasi-phase-matching period that is operated at a constant temperature. The wavelength conversion efficiency and the difference-frequency generation bandwidth reach 100%W and 100 nm, respectively. The idler output bandwidth in the 2μm region is obtained by group-velocity matching or phase-mismatch minimization when a 0.94μm pump laser diode and a 1.55μm tunable signal source are used.

© 2006 Optical Society of America

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