Temperature effect of Yb~(3+):YAGslab laser and diamond windowcooling design*
The temperature-related laser performances of the Yb3 +:YAGslablaser have beeninvestigatedbased on quasi-three level rate equation model,whichinclude the energy storage and extraction efficiency.Theresults showthat the extractable energy storage efficiency decreases significantly from43 %to 26 % with the in-crease of the temperature in the lasing slab from 300 to 400 K.We also have demonstrated the feasibility ofdouble-face cooling of lasing slab with a diamond window whose thermal conductivityis so high that a very thinplate suffices to efficiently remove the heat generated in the lasing slab.Si mulation results show that with apump intensity of 15 kW/cm2and repetition rate of 10 Hz,to keep the maxi mumtemperature of the lasing slabbelowa reasonable value,e.g.,less than 320 K,the heat exchange coefficient of water should not be less than2 000 W/(m2.K).The results also showthat under the same cooling condition reducing the thickness of thelasing slab and si multaneously increasing the number of pump passes can effectively reduce the temperature oflasing slab.