A tunable coherent infrared source based on a double-difference-frequency-mixing technique in an indium-doped GaSe crystal in the last stage, with a Nd:YAG laser as the basic pump source, is reported. Angular acceptance as well as spectral acceptance has been measured. The energy output of the infrared radiation has been measured. Absorption characteristics of polystyrene and polythene sheets have been measured with the generated radiation; the main peaks correspond to spectrophotometric measurement.
© 2006 Optical Society of America
Original Manuscript: July 11, 2005
Revised Manuscript: August 30, 2005
Manuscript Accepted: September 2, 2005
Subhasis Das, Chittaranjan Ghosh, Sudipta Gangopadhyay, Udit Chatterjee, Gopal C. Bhar, Valeriy G. Voevodin, and Olga G. Voevodina, "Tunable coherent infrared source from 5-16 µm based on difference-frequency mixing in an indium-doped GaSe crystal," J. Opt. Soc. Am. B 23, 282-288 (2006)