Investigation of temperature distribution and 2.79 μm laser performance on the Er:YSGG single crystal fiber

We demonstrate the temperature distribution and 2.79 mu m laser performance in a high-quality Er:YSGG single crystal fiber (SCF) with size of Phi 0.85x8 mm(3) for the first time. Compared with 2x2x8 mm(3) Er:YSGG bulk crystal, the simulation results show that the center maximum temperature of Er:YSGG SCF is much lower, and the temperature rising and total thermal deformation are evidently reduced, indicating that the SCF possesses more efficient thermal dissipation. Under 970 nm laser diode pumping, a maximum output power of 636 mW with slope efficiency of 20.2% is realized. More importantly, a high beam quality factors M-x(2)/M-y(2) of 1.28/1.29 is obtained, which is close to the fundamental TEM00 mode, suggesting that the Er:YSGG SCF can act as a promising candidate for mid-infrared laser seed source.