Optical Properties and Lasing of YAG Ceramics with Losses

We report on optical properties and lasing of YAG ceramics synthesized at IREE (Fryazino) and IEP (Ekaterinburg). On the best samples of ceramics lasing with the maximum slope efficiency of 40% was received. Specific losses in the ceramics are estimated. An analytical solution of the rate equations on one-pass optical amplification for laser ceramics with losses was obtained.