Spectroscopy of LiTaO3:Tm3+ crystals

Sokólska, I.; Ryba‐Romanowski, W.; Gołąb, Stanisław; Baba, Mamoru; Świrkowicz, M.; Łukasiewicz, T.

doi:10.1016/s0022-3697(00)00041-x

Cited by 47 publications

(25 citation statements)

References 27 publications

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“…4b clearly evidences that the number of observed emission lines is also higher than the number expected for the Stark splitting in a single site with lowest symmetries. Remarkable is the absence of the recombination between the first and the ground state multiplets ( 3 F 4 -3 H 6 ) that in several hosts occurs between 1600 and 2000 nm [5,[10][11][12]. As for these wavelengths, we are in the limit of our spectral resolution; we are not able to warranty that low-energy transitions occur in that spectral region, which could be ascribed to the 3 F 4 -3 H 6 recombination.…”

Section: Resultsmentioning

confidence: 84%

“…For these purposes oxide materials are currently doped with rare-earth (RE) ions in order to improve the efficiency of infrared emission. Among these, trivalent thulium ions are known to offer a number of features in this spectral region due to the intra-4f 12 [5].…”

Section: Introductionmentioning

confidence: 99%

“…The pure and the lowest content doped samples were found to have a monoclinic crystalline structure, while the appearance of a triclinic phase was promoted by higher thulium amounts. Also, the intra-4f 12 recombination was observed for the highest-doped fibre and from excitation energy and temperature dependence of the observed photoluminescence (PL) a model for the recombination processes is proposed.…”

Section: Introductionmentioning

confidence: 99%

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Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres

Macatrão¹,

Peres²,

Rubinger³

et al. 2009

Microelectronics Journal

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a b s t r a c tStructural, spectroscopic and dielectric properties of thulium-doped laser-heated pedestal Ta 2 O 5 as-grown fibres were studied. Undoped samples grow preferentially with a single crystalline monoclinic structure. The fibre with the lowest thulium content (0.1 at%) also shows predominantly a monoclinic phase and no intra-4f 12 Tm 3+ recombination was observed. For sample with the highest thulium amount (1.0 at%), the appearance of a dominant triclinic phase as well as intraionic optical activation was observed. The dependence of photoluminescence on excitation energy allows identification of different site locations of Tm 3+ ions in the lattice. The absence of recombination between the first and the ground-state multiplets as well as the temperature dependence of the observed transitions was justified by an efficient energy transfer between the Tm 3+ ions. Microwave dielectric properties were investigated using the small perturbation theory. At a frequency of 5 GHz, the undoped material exhibits a dielectric permittivity of 21 and for thulium-doped Ta 2 O 5 samples it decreases to 18 for the highest doping concentration. Nevertheless, the dielectric losses maintain a very low value.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres

Macatrão¹,

Peres²,

Rubinger³

et al. 2009

Microelectronics Journal

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show abstract

“…It possesses good electro-optical parameters and nonlinear effect [1][2][3][4][5]. Compared with its isomorph lithium niobate (LiNbO 3 ) crystal, LiTaO 3 is considered to be more attractive due to its smaller birefringence and lower susceptibility to optical damage [6][7][8]. On the other hand, the rare earth (RE) doped ferroelectric crystal has attracted a lot because the laser oscillation combined with nonlinear and ferroelectric effect could be realized by using just one crystal.…”

Section: Introductionmentioning

confidence: 99%

Diode-pumped continuous wave and passively Q-switched Tm, Mg: LiTaO_3 lasers

Feng

Zhao

et al. 2014

Opt. Express

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Abstract:We have demonstrated the continuous wave and passively Qswitched Tm, Mg: LiTaO 3 lasers for the first time. In continuous wave (CW) regime, a maximum CW output power of 1.03 W at 1952 nm was obtained, giving a slope efficiency of 9.5% and a beam quality M 2 = 2.2. In passive Q-switching regime, a single walled carbon nanotube (SWCNT) was employed as saturable absorber (SA). The Tm,Mg:LiTaO 3 laser has yielded a pulse of 560 ns under repetition rate of 34.2 kHz at 1926 nm, corresponding to a single pulse energy of 10.1 μJ. The results indicate a promising potential of nonlinear crystals in the applications for laser host materials.

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“…Doping with transition metal or rare earth ions into crystals can affect efficiency, sensitivity, speed, and spectral response of photorefractive effect. A great amount of studies on LiTaO 3 included crystals containing various dopants, such as Fe, Ce [6], Zn [7], Cr [8], Tm [9], Ho [10], and so on. Fe:LiTaO 3 crystal has been selected as one of holographic storage media for industrial use.…”

Section: Introductionmentioning

confidence: 99%

Growth and studies of optical properties of double‐doped In:Fe:LiTaO₃ crystal

Wang

Fang

et al. 2006

Micro & Optical Tech Letters

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to the flat bottom dielectric slabs, and tested them with a 4 ϫ 2 array antenna. This modification makes the shape of slabs similar to the one shown in Figure 8. Figure 9 shows the H-plane radiation patterns of three cases. With the addition of small notches, the antenna beam can now be scanned up to ϩ40°. CONCLUSIONSA novel design of a steerable array antenna has been demonstrated. The phase shifter is based on a movable dielectric slab placed close to a CPW with air gaps. The impedance mismatch can be avoided by choosing the slab dielectric constant and length for the two extreme positions, namely at d ϭ 0 and d 2 mm. It may be possible to further reduce S 11 by optimizing the impedance mismatching position at d Ͼ 0 instead of d ϭ 0. We also show that the use of preset delay lines can reduce the number of phase shifters. Although the test antenna is designed for 5.8 GHz, the technique can be applied at a much higher frequency. One possible application is for the 77 GHz automobile collision avoidance radar [6]. ACKNOWLEDGMENTSThis project was supported by National Science Foundation ECS-0424414. The authors thank J. Kajiya and J. Ritcey for useful discussions and suggestions. GROWTH AND STUDIES OF OPTICAL PROPERTIES OF DOUBLE-DOPED

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Spectroscopy of LiTaO3:Tm3+ crystals

Cited by 47 publications

References 27 publications

Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres

Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres

Diode-pumped continuous wave and passively Q-switched Tm, Mg: LiTaO_3 lasers

Growth and studies of optical properties of double‐doped In:Fe:LiTaO₃ crystal

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Spectroscopy of LiTaO3:Tm3+ crystals

Cited by 47 publications

References 27 publications

Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres

Structural and optical properties on thulium-doped LHPG-grown Ta2O5 fibres

Diode-pumped continuous wave and passively Q-switched Tm, Mg: LiTaO_3 lasers

Growth and studies of optical properties of double‐doped In:Fe:LiTaO3 crystal

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Growth and studies of optical properties of double‐doped In:Fe:LiTaO₃ crystal