Abstract

We report what we believe to be the first demonstration of a room-temperature, continuous-wave ${\mathrm{Cr}}^{4+}:{\mathrm{Y}}_3{\mathrm{Al}}_5{\mathrm{O}}_{12}$ $({\mathrm{Cr}}^{4+}:\mathrm{YAG})$ double-clad crystal fiber laser grown by the codrawing laser heated pedestal growth method. The threshold is below $100\mathrm{mW}$, which is a factor of 4 lower than previously reported ${\mathrm{Cr}}^{4+}$-doped lasers. A slope efficiency of 6.9% was obtained, and is in good agreement with the numerical simulation. In additional to small core diameter, the low-threshold lasing is made possible by the low propagation loss of $0.08\mathrm{dB}∕\mathrm{cm}$ and the high crystallinity of the core.

© 2008 Optical Society of America

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