Microchip Yb:CaLnAlO<sub>4</sub> lasers with up to 91% slope efficiency

Pavel Loiko; Josep Maria Serres; Xavier Mateos; Xiaodong Xu; Jun Xu; Venkatesan Jambunathan; Petr Navratil; Antonio Lucianetti; Tomas Mocek; Xuzhao Zhang; Uwe Griebner; Valentin Petrov; Magdalena Aguiló; Francesc Díaz; Arkady Major

doi:10.1364/OL.42.002431

Optics Letters
Vol. 42,
Issue 13,
pp. 2431-2434
(2017)
•https://doi.org/10.1364/OL.42.002431

Microchip Yb:CaLnAlO₄ lasers with up to 91% slope efficiency

Pavel Loiko, Josep Maria Serres, Xavier Mateos, Xiaodong Xu, Jun Xu, Venkatesan Jambunathan, Petr Navratil, Antonio Lucianetti, Tomas Mocek, Xuzhao Zhang, Uwe Griebner, Valentin Petrov, Magdalena Aguiló, Francesc Díaz, and Arkady Major

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Pavel Loiko, Josep Maria Serres, Xavier Mateos, Xiaodong Xu, Jun Xu, Venkatesan Jambunathan, Petr Navratil, Antonio Lucianetti, Tomas Mocek, Xuzhao Zhang, Uwe Griebner, Valentin Petrov, Magdalena Aguiló, Francesc Díaz, and Arkady Major, "Microchip Yb:CaLnAlO₄ lasers with up to 91% slope efficiency," Opt. Lett. 42, 2431-2434 (2017)

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Abstract

Multi-watt continuous-wave (CW) operation of tetragonal rare-earth calcium aluminate $Yb : Ca L n {AlO}_{4} (L n = Gd, Y)$ ) 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. % $Yb : {CaGdAlO}_{4}$ laser generated 7.79 W at 1057–1065 nm with a slope efficiency of $η = 84 %$ (with respect to the absorbed pump power). An even higher $η = 91 %$ was achieved with a 2.5 mm long 3 at. % $Yb : {CaYAlO}_{4}$ laser, from which 5.06 W were extracted at 1048–1056 nm. Both lasers produced linearly polarized output ( $σ$ -polarization) with an almost circular diffraction-limited beam ( $M_{x, y}^{2} < 1.1$ ). The output performance of the developed lasers was modeled, yielding an internal loss coefficient as low as $0.004 - 0.007 {cm}^{- 1}$ . In addition, their spectroscopic properties were revisited.

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Crystal	$n_{o} (e)$	$d n_{o} (e) / d T$ , $10^{- 6} K^{- 1}$	$M (a - cut, σ)$ ^a, $m^{- 1} / W$
CALGO	1.918 (o), 1.941 (e)	−7.6(o), −8.6(e)	0.38
CALYO	1.886 (o), 1.909 (e)	−7.8(o), −8.7(e)	0.36

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