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We report a continuous-wave average output power of 2.65 kW from a single Yb:YAG laser rod pumped with 9000 W from 940 nm InGaAs laser diodes. To the best of our knowledge, this is the highest average output power ever reported from a single Yb:YAG gain element. The optical-to-optical efficiency (i.e., output power to raw laser diode optical power) was 28%. We also obtained 860 W with an M2 of 2.1 when pumping with 6000 W, obtaining 14% optical-to-optical efficiency.
Selected Topics in Quantum Electronics, IEEE Journal of (Volume:11 , Issue: 3 )
Date of Publication: May-June 2005