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Abstract
We report on a high-power Ho:YAG single-crystal fiber (SCF) laser inband pumped by a high-brightness Tm-fiber laser at 1908 nm. The Ho:YAG SCF grown by the micro-pulling-down technique exhibits a propagation loss of $0.05\pm 0.005~\text{cm}^{-1}$ at $2.09~\unicode[STIX]{x03BC}\text{m}$ . A continuous-wave output power of 35.2 W is achieved with a slope efficiency of 42.7%, which is to the best of our knowledge the highest power ever reported from an SCF-based laser in the 2 $\unicode[STIX]{x03BC}\text{m}$ spectral range.
Highlights
High-power solid-state lasers in the 2 μm spectral region are actively investigated due to their widespread applications in various fields such as eye-safe coherent laser radar for longrange hard-target measurement[1], hard or soft tissue ablation owing to strong laser absorption by water molecules[2, 3], high-sensitivity global wind and active atmospheric remote sensing[4], and pumping optical parametric oscillators for the development of mid-IR sources[5]
In 2016, such a laser at 2.09 μm was demonstrated for the first time employing a Ho:YAG single-crystal fiber (SCF) fabricated by laser heated pedestal growth (LHPG)[15]
The laser performance in the CW regime is investigated in the present work by utilizing a high-brightness Tm-fiber laser at 1908 nm for the resonant pumping of a Ho:YAG SCF grown by the micro-pulling-down (μ-PD) method
Summary
High-power solid-state lasers in the 2 μm spectral region are actively investigated due to their widespread applications in various fields such as eye-safe coherent laser radar for longrange hard-target measurement[1], hard or soft tissue ablation owing to strong laser absorption by water molecules[2, 3], high-sensitivity global wind and active atmospheric remote sensing[4], and pumping optical parametric oscillators for the development of mid-IR sources[5]. Tmor Ho-SCF based laser systems in the 2 μm spectral range have been seldom reported. A quasi-CW output power of 23.5 W was obtained under pulsed pumping. Output power roll-off was observed at ∼10 W in the pure CW regime. We have reported on the first Q-switched Ho:YAG SCF laser delivering 7.5 ns pulses with 0.19 MW peak power[16]. The laser performance in the CW regime is investigated in the present work by utilizing a high-brightness Tm-fiber laser at 1908 nm for the resonant pumping of a Ho:YAG SCF grown by the micro-pulling-down (μ-PD) method. The laser power of 35 W produced at 2.09 μm is to the best of our knowledge the highest power ever reported from an SCFbased laser in the 2 μm spectral range
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