Abstract

An external-cavity diamond Raman laser generating up to $2.0\mathrm{W}$ at $1240\mathrm{nm}$ from $3.3\mathrm{W}$ of $1064\mathrm{nm}$ pump power is investigated as a function of pump polarization direction. The maximum conversion efficiency was 61%, and the slope efficiency of 84% closely approaches the quantum limit of 85.8%. The lowest threshold for Raman lasing is achieved for pump polarization parallel to the $〈111〉$ axis, which we show is consistent with theory.

© 2010 Optical Society of America

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