28 February 2014 Spectroscopic properties of Pr-doped PbCl2 for eye-safe 1.6µm laser applications
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The 1.6 μm emission properties originating from the 3F3, 3F43H4 transition of Pr3+ ions in Pr-doped PbCl2 crystals were investigated for possible application in resonantly-pumped, eye-safe laser development. Pr: PbCl2 was synthesized and purified through a combination of zone-refinement and chlorination of the melt before growing crystals by Bridgman technique. Under optical pumping using a ~1.48 μm laser diode, an IR emission band centered at ~1.65 μm with a full width at half maximum of 75 nm was observed at room temperature. The decay transient of the thermally coupled 3F3 and 3F4 excited states was single exponential with a value of 170 μs at room temperature. The lifetime increased to 350 μs at 77 K suggesting the existence of some non-radiative decay through multi-phonon relaxation. Emission cross-section spectra were determined using the principle of reciprocity and Ladenburg-Fuchtbauer method and yielded peak values of 3.8x10-20 cm2 and 5.7x10-20 cm2 at room-temperature and 77 K, respectively. The effective gain cross-section spectra of Pr: PbCl2 will be discussed for possible lasing in the 1.6-1.7 μm region.
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Ivy K. Jones, Uwe Hömmerich, EiEi Brown, Sudhir B. Trivedi, "Spectroscopic properties of Pr-doped PbCl2 for eye-safe 1.6µm laser applications", Proc. SPIE 8959, Solid State Lasers XXIII: Technology and Devices, 89591T (28 February 2014); doi: 10.1117/12.2037374; https://doi.org/10.1117/12.2037374

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