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Tunable Cr2+,Fe2+:Zn1-xMnxSe (x = 0.05) and (x = 0.3) lasers around 4.4 µm at 78 K pumped by a 1.94 µm Tm:fiber laser via Cr2+ → Fe2+ energy transfer
Author(s): Adam Říha; Maxim E. Doroshenko; Helena Jelínková; Michal Jelínek; Michal Němec; Václav Kubeček; Miroslav Čech; Nazar O. Kovalenko; Igor S. Terzin
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Paper Abstract

New laser applications as medicine treatment, air pollutants measurement, free-space communications, target illumination, and industrial technologies require laser radiation in the mid-infrared region of 4–6 μm where Fe2+-based lasers can generate. Pumping of Fe2+-doped active material is usually provided by sources generating near 3 μm (as YAG:Er, Er-fiber, or ZnSe:Cr) fitting the Fe2+ absorption maximum. Other promising pumping way is the energy transfer from Cr2+ to Fe2+ in co-doped materials. This energy transfer process in gain-switched operation under 200 ns, 1.73 μm pulse excitation was reported recently. In this paper we would like to present 1 ms, 10 Hz laser operation of the Zn1-xMnxSe:Fe2+,Cr2+ (x = 0.3) crystal within the 78–110 K temperature range under 1.94 μm commercial Tm:fiber laser pumping. The active crystal was placed in the cryostat and the cavity was formed by a curved dichroic pumping mirror and a curved output coupler. The slope efficiency of 1 % was achieved for 1.94 μm pumping at 78 K. The central laser output wavelength at 78 K was ~4.45 μm and the output spectrum temperature shift was about 2 nm/K. Furthermore, tunability range over 300 nm (4.35–4.67 μm) obtained at 78 K using intracavity tuning element. The results will be compared to an analogous Zn1-xMnxSe:Fe2+ (x = 0.3) crystal in a gain-switched mode under Q-switched YAG:Er3+ 2.94 μm laser pumping. Moreover, laser generation of crystals with different Mn concentration and CW generation will be also presented.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 1125919 (21 February 2020); doi: 10.1117/12.2542819
Show Author Affiliations
Adam Říha, Czech Technical Univ. in Prague (Czech Republic)
Maxim E. Doroshenko, A. M. Prokhorov General Physics Institute (Russian Federation)
Helena Jelínková, Czech Technical Univ. in Prague (Czech Republic)
Michal Jelínek, Czech Technical Univ. in Prague (Czech Republic)
Michal Němec, Czech Technical Univ. in Prague (Czech Republic)
Václav Kubeček, Czech Technical Univ. in Prague (Czech Republic)
Miroslav Čech, Czech Technical Univ. in Prague (Czech Republic)
Nazar O. Kovalenko, Institute for Single Crystals of the NASU (Ukraine)
Igor S. Terzin, Institute for Single Crystals of the NASU (Ukraine)


Published in SPIE Proceedings Vol. 11259:
Solid State Lasers XXIX: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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