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• W3191355830 abstract "We report on the development of a novel laser crystal with broadband emission properties at ∼2 µm – a Tm 3+ ,Li + -codoped calcium tantalum gallium garnet (Tm:CLTGG). The crystal is grown by the Czochralski method. Its structure (cubic, sp. gr. <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>I</mml:mi> <mml:mi>a</mml:mi> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mover> <mml:mn>3</mml:mn> <mml:mo stretchy=false>¯<!-- ¯ --></mml:mo> </mml:mover> </mml:mrow> <mml:mi>d</mml:mi> </mml:math> , a = 12.5158(0) Å) is refined by the Rietveld method. Tm:CLTGG exhibits a relatively high thermal conductivity of 4.33 Wm -1 K -1 . Raman spectroscopy confirms a weak concentration of vacancies due to the charge compensation provided by Li + codoping. The transition probabilities of Tm 3+ ions are determined using the modified Judd-Ofelt theory yielding the intensity parameters Ω 2 = 5.185, Ω 4 = 0.650, Ω 6 = 1.068 [10 −20 cm 2 ] and α = 0.171 [10 −4 cm]. The crystal-field splitting of the Tm 3+ multiplets is revealed at 10 K. The first diode-pumped Tm:CLTGG laser generates 1.08 W at ∼2 µm with a slope efficiency of 23.8%. The Tm 3+ ions in CLTGG exhibit significant inhomogeneous spectral broadening due to the structure disorder (a random distribution of Ta 5+ and Ga 3+ cations over octahedral and tetrahedral lattice sites) leading to smooth and broad gain profiles (bandwidth: 130 nm) extending well above 2 µm and rendering Tm:CLTGG suitable for femtosecond pulse generation." @default.
• W3191355830 created "2021-08-16" @default.
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• W3191355830 date "2021-08-11" @default.
• W3191355830 modified "2023-10-10" @default.
• W3191355830 title "Tm³⁺-doped calcium lithium tantalum gallium garnet (Tm:CLTGG): novel laser crystal" @default.
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• W3191355830 doi "https://doi.org/10.1364/ome.435238" @default.
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