Preparation and properties of disordered NaBi(XO4)2, X=W or Mo, crystals doped with rare earths

Волков, В. В.; Rico, Mauricio; Méndez-Blas, Antonio; Zaldo, C.

doi:10.1016/s0022-3697(01)00084-1

Cited by 84 publications

(52 citation statements)

References 13 publications

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“…7͒ while the birefringence of NaBi͑WO 4 ͒ 2 is much larger. 25 Only brief and unpolarized Raman studies are known for NaGdW and they were performed with polycrystalline samples. 26 The strongest Raman peak of the stretching vibration of the ͓WO 4 ͔ 2− anion, the 1 ͑A 1 ͒ mode according to the scheelite I4 1 / a symmetry, was found at 919 cm −1 in NaGdW.…”

Section: Optical and Raman Properties Of Undoped And Ytterbium Dmentioning

confidence: 99%

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(W
Cascales
¹
,
Serrano
²
,
Esteban‐Betegón
³

et al. 2006
Phys. Rev. B
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Single crystals of Yb 3+ -doped NaGd͑WO 4 ͒ 2 with up to 20 mol % ytterbium content have been grown by the Czochralski technique in air or in N 2 +O 2 atmosphere and cooled to room temperature at different rates ͑4-250°C/h͒. Only the noncentrosymmetric tetragonal space group I4 accounts for all reflections observed in the single crystal x-ray diffraction analysis. The distortion of this symmetry with respect to the centrosymmetric tetragonal space group I4 1 / a is much lower for crystals cooled at a fast rate. Na + , Gd 3+ , and Yb 3+ ions share the two nonequivalent 2b and 2d sites of the I4 structure, but Yb 3+ ͑and Gd 3+ ͒ ions are found preferentially in the 2b site. Optical spectroscopy at low ͑5 K͒ temperature provides additional evidence of the existence of these two sites contributing to the line broadening. The comparison with the 2 F 7/2 ͑n͒ and 2 F 5/2 ͑nЈ͒ Stark energy levels calculated using the crystallographic Yb-O bond distances allows to correlate the experimental optical bands with the 2b and 2d sites. As a novel uniaxial laser host for Yb 3+ , NaGd͑WO 4 ͒ 2 is characterized also with respect to its transparency, band-edge, refractive indices, and main optical phonons. Continuous-wave Yb 3+ -laser operation is studied at room temperature both under Ti:sapphire and diode laser pumping. A maximum slope efficiency of 77% with respect to the absorbed power is achieved for the polarization by Ti:sapphire laser pumping in a three-mirror cavity with Brewster geometry. The emission is tunable in the 1014-1079 nm spectral range with an intracavity Lyot filter. Passive mode locking of this laser produces 120 fs long pulses at 1037.5 nm with an average power of 360 mW at Ϸ97 MHz repetition rate. Using uncoated samples of Yb: NaGd͑WO 4 ͒ 2 at normal incidence in simple two-mirror cavities, output powers as high as 1.45 W and slope efficiencies as high as 51% are achieved with different diode laser pump sources.

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Section: Optical and Raman Properties Of Undoped And Ytterbium Dmentioning

confidence: 99%

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(W
Cascales
¹
,
Serrano
²
,
Esteban‐Betegón
³

et al. 2006
Phys. Rev. B
Self Cite
142
4
81
0
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“…7͒ or Gd, 3 with the exception of T = Bi. 8 The Raman spectra of NaLuW have not been reported in the literature yet. Figure 3 shows the spontaneous Raman spectra recorded at 300 K under polarized conditions using a Jobin-Yvon HR 460 monochromator and a N 2 cooled charge coupled device.…”

Section: Crystal Growth and Host Characterizationmentioning

confidence: 99%

Tunable continuous wave and femtosecond mode-locked Yb3+ laser operation in NaLu(WO4)2

García-Cortés

Cano-Torres

Han

et al. 2007

Journal of Applied Physics

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Continuous wave and femtosecond mode-locked laser operation of Yb 3+ in the tetragonal NaLu͑WO 4 ͒ 2 crystal host is demonstrated by pumping with a Ti:sapphire laser. Pumping with 1.8 W at 974 nm, a maximum output power of 650 mW was achieved at 1029.6 nm. The slope efficiency was in excess of 60%. The laser performance was similar for the two polarizations. By inserting a birefringent filter the output wavelength was tunable from 1010 to 1055 nm. Pulses as short as 90 fs with an average power of 50 mW were generated by passive mode locking at a repetition rate of 95 MHz. These attractive laser properties of NaLu 1−x Yb x ͑WO 4 ͒ 2 are related to the inhomogeneous broadening of the Yb 3+ spectral features resulting from the local disorder of the host crystal. We report the spectroscopic properties of Yb 3+ in the 5 -300 K temperature range and the optical properties of the host at room temperature.

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“…This absorption band has the shape and the range of wavelengths very similar to that of NaBi(MoO 4 ) 2 crystals, annealed in vacuum [61]. When additional absorption is expanding to the uorescence range of rare earth activators (Fig.…”

Section: Mutual Inuence Of Dopantsmentioning

confidence: 81%

“…On the one hand, the oxidation potential of growth atmosphere should not be too high, because otherwise it will be rather dicult for Ce 4+ ions (introduced into the charge as CeO 2 ) to alter their oxidation state for 3+. On the other hand, the annealing of scheelite-like molybdates in the ambient with very low oxygen partial pressure (in particular, vacuum [61]) can lead to the formation of the color centers.…”

Section: Mutual Inuence Of Dopantsmentioning

confidence: 99%

Growth of Oxide Laser Crystals by Czochralski Method

et al. 2013

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The growth of series of actual laser crystals belonging to dierent structural types by the Czochralski method is presented. The primary attention is given to single crystalline compounds and their solid solutions with garnet structure (scandium-containing rare-earth garnets with general formula {LnSc}3[ScMe]2Me3O12, Me = Al, Ga) as well as with olivine (forsterite Mg2SiO4) and scheelite structure (double tungstates and molybdates with formula NaLn(TO4)2, where T = Mo or W). The broad bands of luminescence and absorption produced by activator ions in these laser hosts that appear either as a result of structural disorder (garnets, scheelites) or due to the doping by transition metal ions (chromium in forsterite) join together these representatives of dierent structural classes and determine their application in photonics. The paper considers the problems of growing of large crystals with uniform distribution of components and dopants, determination of congruently melting composition, especially in compounds with complex isomorphism. The mutual inuence of components and dopants, redistribution of ions along crystallographically non-equivalent sites in the structure, alteration of valency of transition metal ions accompanied with the change of their segregation coecients under variation of redox conditions is discussed.

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Preparation and properties of disordered NaBi(XO4)2, X=W or Mo, crystals doped with rare earths

Cited by 84 publications

References 13 publications

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(W
Cascales
¹
,
Serrano
²
,
Esteban‐Betegón
³

et al. 2006
Phys. Rev. B
Self Cite
142
4
81
0
View full text Add to dashboard Cite

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(W
Cascales
¹
,
Serrano
²
,
Esteban‐Betegón
³

et al. 2006
Phys. Rev. B
Self Cite
142
4
81
0
View full text Add to dashboard Cite

Tunable continuous wave and femtosecond mode-locked Yb3+ laser operation in NaLu(WO4)2

Growth of Oxide Laser Crystals by Czochralski Method

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Preparation and properties of disordered NaBi(XO4)2, X=W or Mo, crystals doped with rare earths

Cited by 84 publications

References 13 publications

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(WCascales1, Serrano2, Esteban‐Betegón3 et al. 2006Phys. Rev. BSelf Cite1424810View full textAdd to dashboardCite

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(WCascales1, Serrano2, Esteban‐Betegón3 et al. 2006Phys. Rev. BSelf Cite1424810View full textAdd to dashboardCite

Tunable continuous wave and femtosecond mode-locked Yb3+ laser operation in NaLu(WO4)2

Growth of Oxide Laser Crystals by Czochralski Method

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Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(W
Cascales
¹
,
Serrano
²
,
Esteban‐Betegón
³

et al. 2006
Phys. Rev. B
Self Cite
142
4
81
0
View full text Add to dashboard Cite

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(W
Cascales
¹
,
Serrano
²
,
Esteban‐Betegón
³

et al. 2006
Phys. Rev. B
Self Cite
142
4
81
0
View full text Add to dashboard Cite