Samarium-doping concentration influence on spectroscopic parameters of Sm:YAG crystal

Michal Němec; Jan Šulc; Helena Jelínková; Alena Zavadilová; Karel Nejezchleb; Nick Kapitch

doi:10.1117/12.2544604

21 February 2020 Samarium-doping concentration influence on spectroscopic parameters of Sm:YAG crystal

Michal Němec, Jan Šulc, Helena Jelínková, Alena Zavadilová, Karel Nejezchleb, Nick Kapitch

Proceedings Volume 11259, Solid State Lasers XXIX: Technology and Devices; 1125921 (2020) https://doi.org/10.1117/12.2544604
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

The main goal of this work was to characterize the spectroscopic properties (absorption, fluorescence, and lifetime) of the samarium ion in the yttrium-aluminum-garnet matrix. The Sm:YAG crystals with various samarium concentrations (1, 3, 6.4, 10, and 20 at.% Sm/Y in the melt) were produced by the edge-defined, film-fed growth technique. Absorption characteristics were investigated in the spectral range of 185 - 3100 nm with detailed measurements in the near-infrared range of 1058 to 1125 nm, corresponding the energy level transition ⁶H_5/2 → ⁶F_9/2. The results indicate that the specific absorption properties of the Sm:YAG crystal could be advantageously used to an absorption of parasitic fluorescence around 1064 nm, generated by Nd:YAG laser. Concerning emission dependencies in a visible spectral region from 520 to 850 nm, a dominant peak was observed at 618 nm. In the infra-red spectral range from 850 to 1450 nm the dominant peak was found at the wavelength of 1231 nm. From the ⁴G_5/2 level lifetime measurements, the dependence of lifetime on the samarium ions concentration in the YAG matrix was proven. Lifetime values ranged from 0.2 (20 at.% Sm/Y) to 2.0 ms (1.0 at.% Sm/Y). From the spectroscopic results it follows that the Sm:YAG crystal is a suitable candidate for attenuation of an unwanted spontaneous radiation at 1064 nm wavelength of the Nd:YAG laser or for lightconversion from UV to yellow-red visible region.

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Michal Němec, Jan Šulc, Helena Jelínková, Alena Zavadilová, Karel Nejezchleb, and Nick Kapitch "Samarium-doping concentration influence on spectroscopic parameters of Sm:YAG crystal", Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 1125921 (21 February 2020); https://doi.org/10.1117/12.2544604

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KEYWORDS

Crystals

Samarium

Absorption

Ions

Luminescence

Laser crystals

Nd:YAG lasers

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