Abstract

We describe the lasing characteristics of a 1,1′,3,3,3′,3′-hexamethylindotricarbocyanine iodide infrared dye laser. The absorption spectrum of the dye dissolved in ethanol has a large peak centered at 744 nm. The fluorescence exhibits a Stokes shift of ~36 nm with a lifetime of 1.7 ± 0.3 ns. For dye laser pumping at 587 nm the laser threshold was 0.3 mJ, and the slope efficiency was 22% at the central lasing wavelength of 807 nm. The effect of various loss mechanisms is also discussed.

© 1991 Optical Society of America

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