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Inorg. Mater. (Engl. Transl.); (United States)

Luminescence and stimulated emission of orthorhombic crystal of YAlO/sub 3/-Ho/sup 3 +/

А. А. Каминский, Vladimir M. Garmash, G. A. Ermakov, V.A. Akkerman, A. A. Filimonov, K. Kurbakov

Published Feb 1, 1987• 0 citations
OpenAlex

Abstract

The authors study the excitation of stimulated emission of Ho/sup 3 +/ ions in a single crystal of YAlO/sub 3/ by waves of inter-Stark transitions of three generation channels /sup 5/S/sub 2/ to /sup 5/I/sub 5-7/ at 300 K with optical pumping. They also measure the main luminescence characteristics.

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Stimulated emission was obtained from Tu 3+ ions in YAlO 3 crystals doped with 1.0 at. % Tu and 0.1 at. % Cr. The stimulated radiation was generated by the 3 F 4 → 3 H 5 (λ 1 )→ 3 H 5 → 3 H 6 (λ 2 ) cascade at wavelengths λ 1 = 2.34 μ and λ 1 =1.93 μ and the threshold was 3.5 J/cm at 90 °K. A scheme of radiative and nonradiative transitions between the terms was constructed. The absorption and luminescence spectra recorded at 4.2 °K were used to derive the Stark splitting scheme of the 3 H 4 and 3 H 6 terms of the thulium ion.
The possibility of using stimulated emission to improve the optical pumping of Tm3+ ions embedded in Tm3+:YAG to the 3F4 level is explored. The oscillator strengths and the frequencies of the transitions between the ground crystal field level of 3H4 to the different crystal field levels of 3F4 are measured at low temperature. Stimulated emission measurements at 1461 nm are performed to evaluate the optical pumping efficiency. Application to the spectral tailoring of Tm3+:YAG for quantum information applications is discussed.