Thermal effects in quasi-continuous-wave Nd3+:Y3Al5O12 nanocrystalline-powder random laser

We report an experimental investigation on the thermal effects in a ${\mathrm{Nd}}^{\text{3+}}:{\mathrm{Y}}_3{\mathrm{Al}}_5{\mathrm{O}}_{12}$ nanocrystalline-powder random laser with a one-mirror structure by quasi-continuous-wave laser diode pumping. Extremely low thermal conductivity in powder and significant temperature dependence of the narrow emission spectrum of ${\mathrm{Nd}}^{\text{3+}}:{\mathrm{Y}}_3{\mathrm{Al}}_5{\mathrm{O}}_{12}$ leads to a laser line redshift and gain reduction with a higher heat deposit. Mode drifting induced by the temperature dependence of the refractive index is also discussed.