2006
DOI: 10.1103/physrevb.74.174114
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Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(W

Abstract: 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… Show more

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Cited by 142 publications
(87 citation statements)
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“…The NaLn(WO 4 ) 2 compound has the scheelite-type tetragonal structure (space group: I − 4), in which there are two different lattice sites occupied by the [Na 2-group has the S 4 site symmetry [24][25][26]. In this structure, tungsten is coordinated by four oxygen atoms at a tetrahedral site and the [La 3+ /Na + ] site is coordinated eightfold by oxygen [27,28], as shown in Figure S1.…”
Section: Direct Crystallization Of Naln(wo 4 ) 2 (Ln=la-dy and Y)mentioning
confidence: 99%
“…The NaLn(WO 4 ) 2 compound has the scheelite-type tetragonal structure (space group: I − 4), in which there are two different lattice sites occupied by the [Na 2-group has the S 4 site symmetry [24][25][26]. In this structure, tungsten is coordinated by four oxygen atoms at a tetrahedral site and the [La 3+ /Na + ] site is coordinated eightfold by oxygen [27,28], as shown in Figure S1.…”
Section: Direct Crystallization Of Naln(wo 4 ) 2 (Ln=la-dy and Y)mentioning
confidence: 99%
“…These problems are usually particularly severe for gain materials with a large emission bandwidth necessary for femtosecond pulse generation. Many of these materials have a disordered crystal structure, and the broad emission spectrum takes its origin in different lattice environments for the laser active ions [23]. However, this disordered lattice restricts the propagation of phonons, which often leads to a significantly lowered thermal conductivity.…”
Section: Mode-locked Thin Disk Lasersmentioning
confidence: 99%
“…Thus, the flux method has to be used [23], which is a technique with very slow growth rates. Consequently, large crystals of high optical quality are harder to obtain than with the Czochralski or heat exchanger method.…”
Section: Yb:tungstatesmentioning
confidence: 99%
“…Thus, the assignment of each A, B, C or D site to a specific site in the crystal structure must be led by the symmetry-related characteristics of the optical centers resolved in the FLN spectra. Though Eu 3+ ion usually substitutes lanthanide cations in most of lanthanide-based compounds, in some mixed oxides, containing monovalent cations, these ions may have the same, or nearly the same, oxygen coordination than the one at the lanthanide site giving rise to some structural disorder [16] which facilitates the occupancy of these sites by the RE ions if charge compensation is allowed; therefore, we start this correlation with the inspection of the symmetry characteristics of their oxygen environments.…”
Section: Correlation Of Fln Isolated Eumentioning
confidence: 99%