Abstract
Multi-watt continuous-wave (CW) operation of tetragonal rare-earth calcium aluminate ) crystals in plano–plano microchip lasers was demonstrated with an almost quantum-defect-limited slope efficiency. Pumped at 978 nm by an InGaAs laser diode, a 3.4 mm long 8 at. % laser generated 7.79 W at 1057–1065 nm with a slope efficiency of (with respect to the absorbed pump power). An even higher was achieved with a 2.5 mm long 3 at. % laser, from which 5.06 W were extracted at 1048–1056 nm. Both lasers produced linearly polarized output (-polarization) with an almost circular diffraction-limited beam (). The output performance of the developed lasers was modeled, yielding an internal loss coefficient as low as . In addition, their spectroscopic properties were revisited.
© 2017 Optical Society of America
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