Growth, spectroscopy and first laser operation of monoclinic Ho3+:MgWO4 crystal

Identifier:  imarina:5733840

Handle: https://hdl.handle.net/20.500.11797/imarina5733840

Authors:  Zhang, Lizhen; Loiko, Pavel; Maria Serres, Josep; Kifle, Esrom; Lin, Haifeng; Zhang, Ge; Vilejshikova, Elena; Dunina, Elena; Kornienko, Alexey; Fomicheva, Liudmila; Griebner, Uwe; Petrov, Valentin; Lin, Zhoubin; Chen, Weidong; Subbotin, Kirill; Aguilo, Magdalena; Diaz, Francesc; Mateos, Xavier

Abstract:
© 2019 A monoclinic 0.86 at.% Ho3+:MgWO4 crystal is grown by the Top-Seeded-Solution Growth method. Its spectroscopic properties are studied with polarized light for E || a, b, c. The Ho3+ ion transition probabilities are determined within the modified Judd-Ofelt theory (mJ-O) accounting for the configuration interaction. The intensity parameters are Ω2 = 21.09, Ω4 = 4.42, Ω6 = 2.28 [10–20 cm2] and α = 0.053 [10-4 cm]. The calculated radiative lifetime of the 5I7 state is 6.18 ms. The Stark splitting of the 5I7 and 5I8 multiplets is determined with low-temperature spectroscopy. The absorption, stimulated-emission (SE) and gain cross-sections for the 5I8 ↔ 5I7 transition are derived. Ho3+:MgWO4 features a large Stark splitting of the ground-state (380 cm-1), high maximum σSE of 1.82 × 10–20 cm2 at 2.083 μm, broad gain spectra and high luminescence quantum yield making it suitable for efficient continuous-wave and mode-locked lasers at ∼2.1 μm. First laser operation of Ho3+:MgWO4 crystal is demonstrated at 2.104 μm reaching a slope efficiency of 72%.