Abstract

We report on an efficient diode-end-pumped polycrystalline $\mathrm{Yb}:{\mathrm{Y}}_2{\mathrm{O}}_3$ ceramic laser. Continuous-wave output power of 4.2 W at 1078 nm was obtained under pump power of 19.5 W. The corresponding slope efficiency was 29%. The beam quality factor $\left(M^2\right)$ at full pump power was measured to be 1.63. The threshold wavelengths of the laser at various output couplings were also investigated. It was found that the threshold wavelengths shifted $\sim 5 \mathrm{nm}$ when the reflectivity of the output coupler changed from 90% to 99.9%, as caused by the strong reabsorption effect in the ceramic sample.

© 2004 Optical Society of America

Random-wavelength solid-state laser

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