Thermal effect study of grazing-incidence amplifier chain

The theoretical experimental studies on thermal effect of LD side-pumped grazing-incidence slab chain were carried out. The thermodynamic model of amplifier grazing-incidence slab amplifier was built up. The temperature distribution, thermal distortion and thermal lensing effect were analyzed in detail. Also, the temperature distribution, thermal stress and thermal strain were simulated by finite element analysis. The influence of different incidence angle, pumping region and slab thickness on the thermal focal length and the optical path difference was discussed. The simulation results provided a basis for predicting the thermal effect, compensating thermal effect and designing amplifier chain.