Tm3+:KY(WO4)2 single crystals: Controlled growth and spectroscopic assessment

Гурецкий, С. А.; Trukhanova, E.L.; Kravtsov, Andrey V.; Gusakova, N.V.; Gorbachenya, K. N.; Kisel, V. E.; Yasukevich, A. S.; Lisiecki, Radosław; Łukowiak, Anna; Karpinsky, D. V.; Özen, Yunus; Özçelik, Sadık; Кулешов, Н. В.

doi:10.1016/j.optmat.2021.111451

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…With our mean set, we can use the remaining points to fit the linewidth of the inhomogeneous distribution to 0.552 nm, or 300 GHz. The calculated broadening of the material is similar to that of Lithium Niobate at low temperature and low concentration, or YLuAG at similar concentration [4], and we observe an approximately four-fold reduction in linewidth compared to room-temperature measurements [10]. The distribution shown in figure 2(b) is then used in equation ( 4) to provide the fitting for the 3 H 4 lifetime in figure 3(a).…”

Section: Excited State Decaymentioning

confidence: 58%

“…N m and N g are in the a-c plane of the crystal. These crystals are particularly suitable for Tm doping because of their relatively broad emission band, large emission cross-section and low excited-state lifetime [7][8][9][10][11][12][13][14][15]. Based on the Hume-Rothery rule [16], stating the atomic radii, r a , of the dopant and host atoms must differ by no more than 15%, Tm (r a = 175 pm) can substitute Y (r a = 180 pm) in KYW crystal.…”

Section: Introductionmentioning

confidence: 99%

“…Among different host crystals, Tm-doped potassium double tungstate crystals are considered for building versatile and high-power NIR lasers thanks to their broadband and efficient radiation [7][8][9]17]. The change in optical properties of these crystals due to growth conditions [10] and ion concentration has been investigated, in order to characterize their effect on these cross-relaxation processes. Understanding ionion interactions at high concentration is important for developing efficient lasing [17] or light storage [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Optical characterizations of densely doped Tm³⁺:KYW crystals at low temperatures

Lei,

Kling,

Hosseini

2024

J. Opt.

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We investigate the optical lifetime, decay characteristics, spectral linewidth and energy level properties of thulium ions doped in a KY(WO$_{\text{4}}$)$_{\text{2}}$ crystal at 4K temperature. High doping concentration of thulium ions with inhomogeneous broadening allow us to study nonradiative behaviors, instantaneous spectral diffusion, and spectral power broadening in this solid-state material. The theoretical consideration of ion-ion interactions is shown to accurately characterize the absorption, decay and other spectral behaviors of Tm$^{\text{3+}}$ ions. We observe more than ten-fold reduction in the decay time of $^3$H$_4$ state and about three-fold reduction in the spectral-hole lifetime as we approach the center of the inhomogeneous broadening, corresponding to higher optical densities.

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Section: Excited State Decaymentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical characterizations of densely doped Tm³⁺:KYW crystals at low temperatures

Lei,

Kling,

Hosseini

2024

J. Opt.

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“…The Ca 2+ cations in CaWO 4 compounds can be replaced by a combination of monovalent alkali metals and trivalent cations, resulting in the formation of MR(WO 4 ) 2 type compounds with statistical distributions of M + and R 3+ . The CaMoO 4 compound with the scheelite structure can also be replaced by a combination of monovalent alkali metals and trivalent cations, resulting in the formation of MR(MoO 4 ) 2 type compounds with statistical distributions of M + and R 3+ . − The scheelite frame structure is maintained when small Li + or Na + ions share the Ca 2+ site of CaMoO 4 with R 3+ , such as LiLu(MoO 4 ) 2 and LiEu(MoO 4 ) 2 . − However, placing large K + at the Ca 2+ site may destabilize the scheelite frame structure, resulting in less symmetrical crystal structures (monoclinic, triclinic, or orthogonal), such as KEu(WO 4 ) 2 and KY(WO 4 ) 2 . − …”

Section: Introductionmentioning

confidence: 99%

Evidence and Practical Applications of Site Occupancy Theory (SOT) of Eu³⁺ in Scheelite Compounds

Xia,

Chen,

et al. 2024

Inorg. Chem.

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The determination of the site occupancy of activators in phosphors is essential for precise synthesis, understanding the relationship between their luminescence properties and crystal structure, and tailoring their properties by modifying the host composition. Herein, one simple method was proposed to help determine the sites at which the doping of rare earth ions or transition metal ions occupies in the host lattice through site occupancy theory (SOT) for ions doped into the matrix lattice. SOT was established based on the fact that doping ions preferentially occupy the sites with the lowest bonding energy deviations. In order to provide detailed experimental evidence to prove the feasibility of SOT, several scheelite-type compounds were successfully synthesized using a high-temperature solid-phase method. When Eu 3+ ions occupy a similar surrounding environment site, the photoluminescence spectra of the activators Eu 3+ are similar. Therefore, by comparing the intensity ratio of photoluminescence spectra and the mechanism of all transitions of KEu(WO 4 ) 2 , KY(WO 4 ) 2 :Eu 3+ , Na 5 Eu(WO 4 ) 4 , and Na 5 Y(WO 4 ) 4 :Eu 3+ , it was proved that SOT can successfully confirm the site occupation when doped ions enter the matrix lattice. SOT was further applied to the sites occupied by Eu 3+ ion-doped LiAl(MoO 4 ) 2 and LiLu(MoO 4 ) 2 .

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“…Interest in thulium-doped crystals is explained by the availability of powerful AlGaAs diode pump sources emitting at near 800 nm and cross-relaxation process 3 H 6 + 3 H 4 → 3 F 4 + 3 F 4 leading to efficient excitation of 3 F 4 laser level thus increase the quantum efficiency of the systems. Monoclinic potassium double tungstate crystals activated with thulium ions Tm:KY(WO 4 ) 2 (Tm:KYW) attract attention due to relatively high absorption and emission cross-section, broad emission bands, and the possibility to grow highly activated crystals [2]. The great potential of Tm:KYW laser crystal has been already demonstrated in continuous-wave [3], mode-locking [4] and Q-switch [5] regimes of operation.…”

Section: Introductionmentioning

confidence: 99%

Compact Passively Q-Switched Tm:KY(WO<sub>4</sub>)<sub>2</sub> Laser

Kisel

2022

Prib. metody izmer.

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Diode-pumped thulium lasers emitting in the spectral range near 2 μm are attractive for applications in different areas: surgery, rangefinding, and environmental atmosphere monitoring. In this article the latest results of Tm:KYW laser performance with a polycrystalline Cr:ZnSe as the most available saturable absorber for 2 μm spectral region are presented.A maximum continuous-wave output power of ≈ 0.65 W with a slope efficiency of 55 % was obtained at the wavelength of 1940 nm. Laser pulses with energy of 26 μJ and repetiotion rate of 6 kHz coresponding to 156 mW of average output power at 1910 nm were obtained at 2.2 W of incident puwp power for the Cr:ZnSe saturable absorber with initial transmission of 95 %. By using of saturable absorber with lower initial transmission of 90 % laser pulses with energy of 40 μJ and duration as short as 10 ns were realized. The maximal pulse repetition rate was 2.8 kHz at incident pump power of 2.2 W.Based on the obtained results, it can be concluded that Tm:KYW crystals are promising active media for the compact passively Q-switched lasers emitting in the spectral range near 2 μm for the usage in surgery and rangefinding. Also, described laser is planned to be used as a laser source in laser-induced damage threshold measurements setup for investigation of damage threshold of saturable absorbers as well as nonlinear crystals at the wavelength near 2 μm.

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Tm3+:KY(WO4)2 single crystals: Controlled growth and spectroscopic assessment

Cited by 6 publications

References 15 publications

Optical characterizations of densely doped Tm³⁺:KYW crystals at low temperatures

Optical characterizations of densely doped Tm³⁺:KYW crystals at low temperatures

Evidence and Practical Applications of Site Occupancy Theory (SOT) of Eu³⁺ in Scheelite Compounds

Compact Passively Q-Switched Tm:KY(WO<sub>4</sub>)<sub>2</sub> Laser

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Tm3+:KY(WO4)2 single crystals: Controlled growth and spectroscopic assessment

Cited by 6 publications

References 15 publications

Optical characterizations of densely doped Tm3+:KYW crystals at low temperatures

Optical characterizations of densely doped Tm3+:KYW crystals at low temperatures

Evidence and Practical Applications of Site Occupancy Theory (SOT) of Eu3+ in Scheelite Compounds

Compact Passively Q-Switched Tm:KY(WO<sub>4</sub>)<sub>2</sub> Laser

Contact Info

Product

Resources

About

Optical characterizations of densely doped Tm³⁺:KYW crystals at low temperatures

Optical characterizations of densely doped Tm³⁺:KYW crystals at low temperatures

Evidence and Practical Applications of Site Occupancy Theory (SOT) of Eu³⁺ in Scheelite Compounds