Growth of lithium niobate crystals with a periodic domain structure by a modified zone melting method

Wang, W.Y.; Chen, X.L.; Zhang, D.F.; Ni, D.Q.; Wu, Xinming

doi:10.1016/j.jcrysgro.2005.02.026

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Wavelengths of all lines are given in nanometers; the connection of the generated Stokes and anti-Stokes components with the SRS-active vibration modes ω R 1 =799 cm −1 of the crystal is indicated by brackets. oscillation is exerted on the growth front of crystals, crystals of periodic change in compositions with μ -spacing can be produced and as a result an optically periodic structure with alternatively left-handed and right-handed chirality will be created in a crystal. It was reported that a LiNbO3 periodic structure of the alternatively antiparalleled ferroelectric domains along the growth direction was created with a temperature modulation technique (Wang et al , 2005). Unfortunately, because of the crack in some of our crystals, it was not possible for us to obtain large-size NaCl 1− x Br x O 3 mixed crystals with x ∼0.10–0.75.…”

Section: Resultsmentioning

confidence: 99%

Characterization of unidirectionally grown NaCl_1−xBr_xO₃ crystals

Song

Zhang

et al. 2009

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NaCl1−xBrxO3 single crystals were prepared by unidirectional crystallization. The influences of the composition on structure, quality, and optical properties of NaCl1−xBrxO3 crystals were investigated. X-ray powder diffraction analysis revealed that the diffraction patterns for the NaCl1−xBrxO3 crystals have almost the same set of peaks as those of NaClO3 and NaBrO3, except that an extra very weak forbidden (100) diffraction peak was detected at about 13.3° 2θ for crystals grown from solutions of BrO3−∼15–70 at. % (i.e., x=0.15–0.70). These crystals can, therefore, be considered to have a distorted cubic structure closely related to the cubic structures of NaClO3 (x=0) and NaBrO3 (x=1). Our study also found that good-quality crystals can only be obtained in two doping ranges (x>0.75 or x<0.10). Outside these two ranges, the crystals tended to crack and even became opaque. Lattice distortions in the crystals were the probable cause as revealed by X-ray powder diffraction patterns. The optical activity of NaCl1−xBrxO3 crystals measured by a laser was found to decrease from 2.89 to 2.01°/mm with increasing value of x from 0 to 0.02. Stimulated Raman scattering of NaBr0.90Cl0.10O3 crystals was measured using a 0.532-μm ps laser as a pump source and four anti-Stokes lines plus six Stokes lines were observed. The fourth anti-Stokes emission was found to be at 454.5 nm and the sixth Stokes emission at 713.6 nm. Its Raman gain coefficient was determined to be 18.4 cm/Gw.

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Section: Resultsmentioning

confidence: 99%