Growth, spectroscopy and 2 μm laser operation of monoclinic Tm3+:ZnWO4 crystal

We report on the crystal growth, polarized spectroscopy, and laser operation of monoclinic Tm 3+ , Na + (Li + ) codoped zinc monotungstate (ZnWO 4 ) crystals. The Li + codoping with an optimized Tm/Li ratio enables almost complete local charge compensation leading to better crystal quality, higher Tm segregation coefficient, and longer luminescence lifetime and ultimately the demonstration of laser operation. The modified Judd-Ofelt theory was employed to calculate the Tm 3+ transition probabilities yielding a radiative lifetime of the 3 F 4 state of 2.59 ms. The corresponding intensity parameters are Ω 2 = 5.194, Ω 4 = 0.658, Ω 6 = 0.471 [10 −20 cm 2 ] and α = 0.110 [10 −4 cm]. Tm,Li:ZnWO 4 features strongly polarized emission spectra extending beyond 2 μm owing to a large total Stark splitting of the ground-state, Δ E ( 3 H 6 ) = 644 cm −1 . The stimulated-emission cross-section in this spectral range reaches 0.47 × 10 −20 cm 2 at 2015 nm for light polarization E || N p . The continuous-wave Tm,Li:ZnWO 4 laser generated 282 mW at 1.98 μm with a slope efficiency of 14.7 %, and laser emission at 2.03 μm was also achieved. • Czochralski growth of monoclinic Tm 3+ , Na + (Li + ) codoped zinc monotungstate (ZnWO 4 ). • Li + codoping provides higher Tm 3+ segregation and longer luminescence lifetime. • Tm,Li:ZnWO 4 features strongly polarized emission spectra extending beyond 2 μm. • The stimulated-emission cross-section is 0.47 × 10 −20 cm 2 at 2015 nm. • First continuous-wave laser operation of Tm,Li:ZnWO 4 crystal at 2 μm is demonstrated.

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Publication Details

Journal
Optical Materials
Published
2024-09-06
DOI
https://doi.org/10.1016/j.optmat.2024.116039
Citations
4
Primary Topic
Solid State Laser Technologies
Type
article
Field-Weighted Citation Impact
0.83

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Growth, spectroscopy and 2 μm laser operation of monoclinic Tm3+:ZnWO4 crystal

Ghassen Zin Elabedine, К. А. Субботин, Kirill Eremeev, Zhongben Pan et al.
4 citations
Optical Materials
Solid State Laser Technologies
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article

Growth, spectroscopy and 2 μm laser operation of monoclinic Tm3+:ZnWO4 crystal

Ghassen Zin Elabedine, К. А. Субботин, Kirill Eremeev, Zhongben Pan, Е. Б. Дунина, Sergei Pavlov, Valentin Petrov, Pavel Loiko, Francesc Dı́az, Pavel A. Volkov, Yulia I. Zimina, Magdalena Aguiló, Rosa Maria Solé, Weidong Chen, Anatoly Titov, Xavier Mateos, Alain Braud, Y.S. Didenko, Aleksey Kornienko, Л.Н. Фомичева
article en
4 citations

Abstract

We report on the crystal growth, polarized spectroscopy, and laser operation of monoclinic Tm 3+ , Na + (Li + ) codoped zinc monotungstate (ZnWO 4 ) crystals. The Li + codoping with an optimized Tm/Li ratio enables almost complete local charge compensation leading to better crystal quality, higher Tm segregation coefficient, and longer luminescence lifetime and ultimately the demonstration of laser operation. The modified Judd-Ofelt theory was employed to calculate the Tm 3+ transition probabilities yielding a radiative lifetime of the 3 F 4 state of 2.59 ms. The corresponding intensity parameters are Ω 2 = 5.194, Ω 4 = 0.658, Ω 6 = 0.471 [10 −20 cm 2 ] and α = 0.110 [10 −4 cm]. Tm,Li:ZnWO 4 features strongly polarized emission spectra extending beyond 2 μm owing to a large total Stark splitting of the ground-state, Δ E ( 3 H 6 ) = 644 cm −1 . The stimulated-emission cross-section in this spectral range reaches 0.47 × 10 −20 cm 2 at 2015 nm for light polarization E || N p . The continuous-wave Tm,Li:ZnWO 4 laser generated 282 mW at 1.98 μm with a slope efficiency of 14.7 %, and laser emission at 2.03 μm was also achieved. • Czochralski growth of monoclinic Tm 3+ , Na + (Li + ) codoped zinc monotungstate (ZnWO 4 ). • Li + codoping provides higher Tm 3+ segregation and longer luminescence lifetime. • Tm,Li:ZnWO 4 features strongly polarized emission spectra extending beyond 2 μm. • The stimulated-emission cross-section is 0.47 × 10 −20 cm 2 at 2015 nm. • First continuous-wave laser operation of Tm,Li:ZnWO 4 crystal at 2 μm is demonstrated.

Optical MaterialsVol. 157
Centre National de la Recherche Scientifique (FR), D. Mendeleyev University of Chemical Technology of Russia (RU), Vitebsk State Technological University (BY), Shandong University (CN), École Nationale Supérieure d'Ingénieurs de Caen (FR), Chinese Academy of Sciences (CN), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Kurchatov Institute (RU), Fujian Institute of Research on the Structure of Matter (CN), Centre de Recherche sur les Ions, les Matériaux et la Photonique (FR), Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy (DE), Prokhorov General Physics Institute (RU), Universitat Rovira i Virgili (ES), Université de Caen Normandie (FR)
Ministerio de Ciencia, Innovación y Universidades, National Natural Science Foundation of China, European Regional Development Fund
Openalex Percentile: Top 27%
Solid State Laser Technologies
0.83
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