Tunable Mercury Cadmium Telluride Infrared Lasers,
HARRY DIAMOND LABS ADELPHI MD
Pagination or Media Count:
We report the development of the first tunable spin-flip Raman laser SFRL using crystals of the semiconductor alloy mercury cadmium telluride Hg1-xCdxTe. In addition, tunable recombination laser emission has also been observed. When optically pumped by a carbon dioxide CO2 laser, the crystals emit laser radiation that is magnetically tunable in the 9 to 11-micrometer wavelength range. Improved crystal technology should permit extension of this tunable range. Potential applications for these lasers are as local oscillators for infrared heterodyne receivers, as high-brightness, high-resolution sources for determining the laser transmission properties of the atmosphere, and as sources for covert, short-range communications links and isotope separation. Experiments were performed with mercury cadmium telluride crystals that were designed to have their absorption edge in near wavelength coincidence with the various lines available from CO2 laser. The crystals were held at near-liquid-helium temperature, and placed in the field of a superconductive or conventional electromagnet. Both pulsed and cw tunable laser radiations were achieved. Thus far, most of the spectral gaps between the lines of a conventional CO2 laser have been filled using these new tunable lasers.
- Lasers and Masers