Continuous-wave, $15.2\mathrm{W}$ diode-end-pumped $\mathrm{Nd}:\mathrm{YAG}$ laser operating at $946\mathrm{nm}$

Abstract

A high-power continuous-wave (cw) $\mathrm{Nd}:\mathrm{YAG}$ laser operating at $946\mathrm{nm}$ by utilizing a quasi-three-level transition is reported. The laser consists of a composite $\mathrm{Nd}:\mathrm{YAG}$ rod end pumped by a fiber-coupled diode laser and a simple plane-concave cavity. At an incident pump power of $40.2\mathrm{W}$, a maximum cw output of $15.2\mathrm{W}$ at $946\mathrm{nm}$ is obtained, achieving a slope efficiency of 45%. To the best of our knowledge, this is the highest output at $946\mathrm{nm}$ ever generated by diode-pumped $\mathrm{Nd}:\mathrm{YAG}$ lasers. In addition, at an incident pump power of $15.2\mathrm{W}$, a $1.25\mathrm{W}$ blue output at $473\mathrm{nm}$ is achieved with a simple compact three-element cavity and a type-I lithium triborate $\left({\mathrm{LiB}}_3{\mathrm{O}}_5\right)$ crystal as a frequency doubler.

© 2006 Optical Society of America

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