Thermal durability of YAG:Ce ceramic with containing Al2O3 and its Raman analysis

The thermal durability of Y3Al5O12:Ce3+ ceramic was investigated with according to the content of Al2O3 under high-power laser diode (LD) as well as Raman analysis. The spreading of heat generated in the samples increased with increasing the content of Al2O3, consequently, the temperature of hot zone of the samples without, 20, 40, 60 and 80% Al2O3 reached 170.15, 121.53, 97.47, 70.18 and 40.81 °C, respectively, at the LD power of 4.5 W/mm2. In terms of microscopic analysis, the Raman spectra of the samples were monitored at various temperatures. The results presented that the population of phonon significantly increased in the samples with insufficient Al2O3 due to the stagnant heat at local site, which decreased the performance of the samples at the high-power LD.