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Output characteristics of Pr:YAlO3 and Pr:YAG lasers pumped by high-power GaN laser diodes

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Abstract

We investigated whether ${\rm Pr}{:}{{\rm YAlO}_3}$ and ${\rm Pr}{:}{{\rm Y}_3}{{\rm Al}_5}{{\rm O}_{12}}$ (YAG) can work as gain media for high-power visible lasers and replace trivalent praseodymium (Pr)-doped fluoride crystals, with particular focus on thermal loading resistivity. ${\rm Pr}{:}{{\rm YAlO}_3}$ exhibits a high laser gain at 747 nm, and we obtained a maximum output power of 1.2 W and a slope efficiency of 26.7% with high-power GaN laser diode pumping. Excited state absorption and large phonon energy hinder laser oscillation of Pr:YAG at room temperature. We obtained 616 nm laser oscillation of Pr:YAG at 40 K. Furthermore, we achieved a visible laser with Pr:YAG ceramics for the first time. The maximum output power is ${\sim}{30}\;{\rm mW}$ with a slope efficiency of  ${\sim}{0.7}\%$.

© 2020 Optical Society of America

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