PHOTOLUMINESCENCE OF LASING COLOR-CENTERS IN MIXED-CRYSTALS KCL-KBR-O-2

Up to now more than ten color center systems in various host lattices of alkali halides have been successfully developed in tunable lasers; among them are the oxygen stabilized F-2(+) centers. In this work we h ave studied the optical properties of these laser-active centers in mi xed KCl:KBr crystals doped with oxygen, having in mind an extended ran ge of tunability with only one laser crystal. We have observed the emi ssion band shifting from 1.7 to 2.0 mu m depending on the mixing ratio of the two halides, and also other luminescences due to more complex centers related to Na impurity.