Monoclinic Tm<sup>3+</sup>:MgWO<sub>4</sub>: a promising crystal for continuous-wave and passively Q-switched lasers at &#x223C;2&#x2009;&#x2009;&#x03BC;m

Pavel Loiko; Josep Maria Serres; Xavier Mateos; Magdalena Aguiló; Francesc Díaz; Lizhen Zhang; Zhoubin Lin; Haifeng Lin; Ge Zhang; Konstantin Yumashev; Valentin Petrov; Uwe Griebner; Yicheng Wang; Sun Yung Choi; Fabian Rotermund; Weidong Chen

doi:10.1364/OL.42.001177

Optics Letters
Vol. 42,
Issue 6,
pp. 1177-1180
(2017)
•https://doi.org/10.1364/OL.42.001177

Monoclinic Tm³⁺:MgWO₄: a promising crystal for continuous-wave and passively Q-switched lasers at ∼2 μm

Pavel Loiko, Josep Maria Serres, Xavier Mateos, Magdalena Aguiló, Francesc Díaz, Lizhen Zhang, Zhoubin Lin, Haifeng Lin, Ge Zhang, Konstantin Yumashev, Valentin Petrov, Uwe Griebner, Yicheng Wang, Sun Yung Choi, Fabian Rotermund, and Weidong Chen

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Pavel Loiko, Josep Maria Serres, Xavier Mateos, Magdalena Aguiló, Francesc Díaz, Lizhen Zhang, Zhoubin Lin, Haifeng Lin, Ge Zhang, Konstantin Yumashev, Valentin Petrov, Uwe Griebner, Yicheng Wang, Sun Yung Choi, Fabian Rotermund, and Weidong Chen, "Monoclinic Tm³⁺:MgWO₄: a promising crystal for continuous-wave and passively Q-switched lasers at ∼2 μm," Opt. Lett. 42, 1177-1180 (2017)

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Abstract

Monoclinic thulium-doped magnesium monotungstate, ${Tm}^{3 +} : {MgWO}_{4}$ , is promising for efficient power-scalable continuous-wave (CW) and passively Q-switched lasers at $> 2 μm$ . Under diode pumping at 802 nm, a compact CW laser based on $Z$ -cut $Tm : {MgWO}_{4}$ generated 3.09 W at 2022–2034 nm with a slope efficiency of 50% which represents the highest output power ever achieved with this type of laser host. Stable passive $Q$ -switching of the $Tm : {MgWO}_{4}$ laser is demonstrated for the first time, to the best of our knowledge, using single-walled carbon nanotubes, graphene, and ${Cr}^{2 +} : ZnS$ saturable absorbers. Using the latter, the best performance is achieved with 16.1 μJ/13.6 ns pulses at 2017.8 nm with a maximum average output power of 0.87 W and a peak power of 1.18 kW.

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SA	$P_{out}$ , mW	$η$ , %	$η_{conv}$ , %	$E_{out}$ , μJ	$Δ τ$ , ns	PRF, kHz	$P_{peak}$ , W
${Cr}^{2 +} : ZnS$	872	23	47	16.1	13.6	54.2	1184
SWCNT	317	22	39	1.5	117	215	12.6
Graphene	274	18	30	1.2	201	229	6.0

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