Abstract

A significant advancement of cw lasing in ${\mathrm{Cr}}^{4+}\text{:}{\mathrm{Y}}_3{\mathrm{Al}}_5{\mathrm{O}}_{12}$ (${\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}$) double-clad crystal fiber grown by the codrawing laser-heated pedestal growth technique was demonstrated at RT. The optical-to-optical slope efficiency of 33.9% is the highest, to the best of our knowledge, among all ${\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}$ lasers, whether they are in bulk or fiber forms. The low-threshold lasing of $78.2\mathrm{mW}$ and high efficiency are in good agreement with the simulation. The keys to the high laser efficiency are twofold: one is the improved ${\mathrm{Cr}}^{4+}$ emission cross section and fluorescence lifetime due to release of the strain on the distorted ${\mathrm{Cr}}^{4+}$ tetrahedron, which also mitigates photobleaching in ${\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}$; the other is the improved core uniformity at long fiber lengths. In addition, because of the low threshold, the impact of excited state absorption of the pump light is significantly reduced. The effects of crystal-orientation, self-selected, and pump-dependent linear polarization states were also addressed.

© 2011 Optical Society of America

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