Spectroscopic properties of Pr-doped PbCl2 for eye-safe 1.6µm laser applications

Ivy K. Jones; Uwe Hömmerich; EiEi Brown; Sudhir B. Trivedi

doi:10.1117/12.2037374

28 February 2014 Spectroscopic properties of Pr-doped PbCl₂ for eye-safe 1.6µm laser applications

Ivy K. Jones, Uwe Hömmerich, EiEi Brown, Sudhir B. Trivedi

Proceedings Volume 8959, Solid State Lasers XXIII: Technology and Devices; 89591T (2014) https://doi.org/10.1117/12.2037374
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

The 1.6 μm emission properties originating from the ³F₃, ³F₄ → ³H₄ 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, and 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); https://doi.org/10.1117/12.2037374

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KEYWORDS

Absorption

Crystals

Ions

Laser applications

Laser crystals

Optical pumping

Semiconductor lasers

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