The influence of low Gd3+ codoping on spectroscopic and laser properties of diode pumped Tm,Gd:SrF2 laser

Karel Veselský; Michal Jelínek; Václav Kubecek; Jan Šulc; Helena Jelínková; Yangxiao Wang; Zhonghan Zhang; Liangbi Su

doi:10.1117/12.2606575

4 March 2022 The influence of low Gd³⁺ codoping on spectroscopic and laser properties of diode pumped Tm,Gd:SrF₂ laser

Karel Veselský, Michal Jelínek, Václav Kubecek, Jan Šulc, Helena Jelínková, Yangxiao Wang, Zhonghan Zhang, Liangbi Su

Proceedings Volume 11980, Solid State Lasers XXXI: Technology and Devices; 119800B (2022) https://doi.org/10.1117/12.2606575
Event: SPIE LASE, 2022, San Francisco, California, United States

Conference Poster

Abstract

We present the influence of optically inactive Gd³⁺ ions codoping on the spectroscopic and laser properties of a novel fluoride Tm,Gd:SrF₂ crystal. Eight crystals in shape of single-fiber (r = 2 mm, l = 5 mm) with different low Gd³⁺ (0, 0.5, 1, 2 at.%) and Tm³⁺ (2 and 3 at. %) concentrations were tested. The addition of an inactive ion Gd³⁺ had an influence on the absorption spectra, especially on the value of the absorption coefficient in the 0.76 μm pumping band. The fluorescence spectra excited at 763 nm have been influenced only slightly promoting lower wavelength peaks of ³F₄→3H₆ transition. The 2 μm fluorescence decay time was measured. The decay curves exhibited double exponential behavior, and two components of lifetime were estimated. While the faster component of about 5.5 ms increased with the Gd³⁺ addition, the slower component of about 19.7 ms was not affected. The Tm,Gd:SrF₂ quasi-cw laser was tested. The pumping diode emitting at a wavelength of 763 nm was operating in the pulse regime (5 ms pulse duration, 10 Hz repetition rate). A 148 mm long hemispherical resonator formed by a flat pump mirror and a curved (r = 150 mm) output coupler was used. The Gd3+ addition had not a strong effect on the laser performance and the high slope efficiency up to 57 % with maximum output power amplitude up to 5.5 W at 1949 nm was achieved with all samples. For wavelength tuning, a MgF₂ birefringent filter was used and the wide tunability range of up to 199 nm (1807 – 2006 nm) was reached.

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Karel Veselský, Michal Jelínek, Václav Kubecek, Jan Šulc, Helena Jelínková, Yangxiao Wang, Zhonghan Zhang, and Liangbi Su "The influence of low Gd³⁺ codoping on spectroscopic and laser properties of diode pumped Tm,Gd:SrF₂ laser", Proc. SPIE 11980, Solid State Lasers XXXI: Technology and Devices, 119800B (4 March 2022); https://doi.org/10.1117/12.2606575

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