Spectroscopic properties and continuous-wave deep-red laser operation of Eu<sup>3+</sup>-doped LiYF<sub>4</sub>

Maxim Demesh; Anatol Yasukevich; Viktor Kisel; Elena Dunina; Alexey Kornienko; Vladimir Dashkevich; Valentin Orlovich; Elena Castellano-Hernández; Christian Kränkel; Nikolay Kuleshov

doi:10.1364/OL.43.002364

Optics Letters
Vol. 43,
Issue 10,
pp. 2364-2367
(2018)
•https://doi.org/10.1364/OL.43.002364

Spectroscopic properties and continuous-wave deep-red laser operation of Eu³⁺-doped LiYF₄

Maxim Demesh, Anatol Yasukevich, Viktor Kisel, Elena Dunina, Alexey Kornienko, Vladimir Dashkevich, Valentin Orlovich, Elena Castellano-Hernández, Christian Kränkel, and Nikolay Kuleshov

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Maxim Demesh, Anatol Yasukevich, Viktor Kisel, Elena Dunina, Alexey Kornienko, Vladimir Dashkevich, Valentin Orlovich, Elena Castellano-Hernández, Christian Kränkel, and Nikolay Kuleshov, "Spectroscopic properties and continuous-wave deep-red laser operation of Eu³⁺-doped LiYF₄," Opt. Lett. 43, 2364-2367 (2018)

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Abstract

${Eu}^{3 +}$ -doped ${LiYF}_{4}$ is reexamined as a laser material for the visible spectral region. Polarized absorption and emission cross sections as well as the fluorescence lifetime are determined. Branching ratios and radiative lifetime are calculated within the theory of $4 f - 4 f$ transition intensities, which takes into account the influence of an excited configuration of the opposite parity $4 f^{N - 1} 5 d$ . Continuous-wave laser operation at 702 nm is demonstrated with a maximum output power of 15 mW and a slope efficiency of 4.6% under pumping with a frequency-doubled Ti:sapphire laser at 393.5 nm.

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Transition	$f_{\exp}^{ed}$ , $10^{6}$	$f_{ASCI}^{ed}$ , $10^{6}$
${}^{7}{F_{0,1}} \to {}^{7}{F_{6}}$	0.8271	0.8410
${}^{7}{F_{2}} \to {}^{5}{D_{0}}$	0.0004	0.0004
${}^{7}{F_{1}} \to {}^{5}{D_{0}}$	0.0095	0.0120
${}^{7}{F_{2}} \to {}^{5}{D_{1}}$	0.0009	0.0011
${}^{7}{F_{1}} \to {}^{5}{D_{1}}$	0.0113	0.0105
${}^{7}{F_{0}} \to {}^{5}{D_{1}}$	0.0130	0.0156
${}^{7}{F_{2}} \to {}^{5}{D_{2}}$	0.0007	0.0005
${}^{7}{F_{1}} \to {}^{5}{D_{2}}$	0.0025	0.0019
${}^{7}{F_{0}} \to {}^{5}{D_{2}}$	0.0296	0.0181
${}^{7}{F_{1}} \to {}^{5}{D_{3}}$	0.0204	0.0032
${}^{7}{F_{2}} \to {}^{5}{D_{3}}$	0.0011	0
${}^{7}{F_{0,1}} \to {}^{5}{L_{6}}$	1.3576	1.3741
${}^{7}{F_{0,1}} \to {}^{5}{G_{2 \dots 6}}$ , ${}^{7}{F_{0,1}} \to {}^{5}{L_{7,8}}$	0.6993	0.6503
${}^{7}{F_{1}} \to {}^{5}{D_{4}}$	0.0256	0.0112
${}^{7}{F_{0}} \to {}^{5}{D_{4}}$	0.1089	0.1033

Set of Parameters
$O_{d k}$ , $O_{c k}$ ( $10^{- 10} cm$ )	$O_{d 2} = 1.2733$ , $O_{d 4} = 1.2016$ , $O_{d 6} = 0.8858$ , $O_{c 2} = - 0.0692$ , $O_{c 4} = - 0.0277$ , $O_{c 6} = 0.0154$
$Δ_{d}$ , $Δ_{c 1}$ , $Δ_{c 2}$ ( ${cm}^{- 1}$ )	$Δ_{d} = 66581$ , $Δ_{c 1} = 25500$ , $Δ_{c 2} = 24771$

Transition ${}^{5}{D_{0}} \to$	Wavelength Range (nm)	$β_{calc}$ (ASCI) (%)	$β_{J^{'} J}$ (%)
${}^{7}{F_{1}}$	585–600	40	42.6
${}^{7}{F_{2}}$	608–630	37.3	36.5
${}^{7}{F_{3}}$	646–655	0	2
${}^{7}{F_{4}}$	688–705	21.5	18.9
${}^{7}{F_{5}}$	742–757	0	0
${}^{7}{F_{6}}$	807–829	1.2	0

Transition	$f_{\exp}^{ed}$ , $10^{6}$	$f_{ASCI}^{ed}$ , $10^{6}$
${}^{7}{F_{0,1}} \to {}^{7}{F_{6}}$	0.8271	0.8410
${}^{7}{F_{2}} \to {}^{5}{D_{0}}$	0.0004	0.0004
${}^{7}{F_{1}} \to {}^{5}{D_{0}}$	0.0095	0.0120
${}^{7}{F_{2}} \to {}^{5}{D_{1}}$	0.0009	0.0011
${}^{7}{F_{1}} \to {}^{5}{D_{1}}$	0.0113	0.0105
${}^{7}{F_{0}} \to {}^{5}{D_{1}}$	0.0130	0.0156
${}^{7}{F_{2}} \to {}^{5}{D_{2}}$	0.0007	0.0005
${}^{7}{F_{1}} \to {}^{5}{D_{2}}$	0.0025	0.0019
${}^{7}{F_{0}} \to {}^{5}{D_{2}}$	0.0296	0.0181
${}^{7}{F_{1}} \to {}^{5}{D_{3}}$	0.0204	0.0032
${}^{7}{F_{2}} \to {}^{5}{D_{3}}$	0.0011	0
${}^{7}{F_{0,1}} \to {}^{5}{L_{6}}$	1.3576	1.3741
${}^{7}{F_{0,1}} \to {}^{5}{G_{2 \dots 6}}$ , ${}^{7}{F_{0,1}} \to {}^{5}{L_{7,8}}$	0.6993	0.6503
${}^{7}{F_{1}} \to {}^{5}{D_{4}}$	0.0256	0.0112
${}^{7}{F_{0}} \to {}^{5}{D_{4}}$	0.1089	0.1033

Set of Parameters
$O_{d k}$ , $O_{c k}$ ( $10^{- 10} cm$ )	$O_{d 2} = 1.2733$ , $O_{d 4} = 1.2016$ , $O_{d 6} = 0.8858$ , $O_{c 2} = - 0.0692$ , $O_{c 4} = - 0.0277$ , $O_{c 6} = 0.0154$
$Δ_{d}$ , $Δ_{c 1}$ , $Δ_{c 2}$ ( ${cm}^{- 1}$ )	$Δ_{d} = 66581$ , $Δ_{c 1} = 25500$ , $Δ_{c 2} = 24771$

Abstract

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Optics Letters