Source: http://aoot.osa.org/osac/abstract.cfm?uri=osac-2-4-1378
Timestamp: 2019-04-23 08:23:54+00:00

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A Tb3+:KYW crystal was grown by the modified Czochralski technique. Polarized ground state absorption and fluorescence spectra, as well as a fluorescence decay curve, were recorded at room temperature. Radiative properties such as emission probabilities, branching ratios, and radiative lifetime were investigated within the theory of 4f–4f transition intensity in the case of a strong configuration interaction. The limitations of visible laser operation of Tb3+-doped double tungstate crystals are discussed.
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Fig. 1. Tb3+(53 at.%):KYW crystal boule (a); crystallographic and optical indicatrix axes (I2/c setting) (b).
Fig. 2. Absorption spectra of Tb:KYW.
Fig. 3. Energy level scheme of the Tb3+ ion. Dashed vertical lines represent possible ESA transitions, dashed area – the energetic position of the IVCT band of KYW host, black and purple lines – levels of 4f8 and 4f75d1 configurations, respectively.
Fig. 4. Polarized averaged fluorescence spectra of Tb:KYW.
Fig. 5. Fluorescence decay curve of the 5D4 level of Tb:KYW. The solid line represents a single-exponential fit curve.
Fig. 6. Stimulated emission cross sections of Tb:KYW.
(1) S E D , c a l c ( J J ′ ) = 1 4 ∑ k = 2 , 4 , 6 Ω k | ⟨ 4 f n [ S L ] J | | U ( k ) | | 4 f n [ S ′ L ′ ] J ′ ⟩ | 2 ( Δ Δ − E J + Δ Δ − E J ′ ) 2 .

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