Characteristics of 1, 1',3,3,3',3'-hexamethylindotricarbocyanine iodide as a tunable dye laser in the near infrared.

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 approximately 36 nm with a lifetime of 1.