Abstract

It is of much difficulty to provide efficient lasing on YAG:Er³⁺ crystal at the shorter wavelength transition (2.69 µm) of the 3µm-lasing spectrum of Er³⁺ due to high value of ${\text{I}}_{13/2}^4$ level lifetime and because of cross-relaxation. Codoping the crystal with Cr³⁺ ions as sensitizers and Tm³⁺ ions disactivating ⁴I_13/2 level, situation changes. However the tendency of Cr: Tm:Er:YAG (CTE-YAG) laser spectrum to longer wave shifting still remains. In this work, the possibilities of stabilizing the STE-YAG lasing spectrum have been studied by the experimental and calculating methods. The method of evaluating the excitation energy transfer efficiency is suggested.

© 1994 IEEE