Charakterisierung von Ho- und Tm-Granat-Laserkristallen

Cr,Tm:YAG and Cr,Tm,Ho:YAG crystals were prepared by the Czochralski crystallization method. Spectroscopic properties and laser characteristics of the crystals were studied with special regard to the influence of dope concentration and pumping parameters on the laser efficiency and to the characterization of the starting behaviour of 2 #mu#m lasers and the time response of the pulses. Within the Cr,Tm system best slope efficiency (1.8%) was obtained with a Cr(2%), Tm(7%):YAG laser rod. A substantially improved slope efficiency (3.8%) was found with a Cr(2%), Tm (5.77%), Ho(0.36%):YAG laser rod at the optimal parameters (2123 nm, 15% mirror transmission, 650 #mu#sec pumping, 3 J power output, 130 J pumping energy). Interaction between the Tm "3H_4 - and the Ho "5J_7 levels leads to an attenuation of the oscillation of the Ho-laser. The different dynamical behaviour of TM- and Ho-lasers has to be considered for medical application. (WEN)SIGLEAvailable from TIB Hannover: F93B1394+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman