Optical characterization and crystal structure of the novel bronzetype Ca x Ba 1‐x Nb 2 O 6 (x = 0.28; CBN‐28)

Room-temperature refractive indices dispersion and anisotropy were measured in single Ca 0.28 Ba 0.72 Nb 2 O 6 (CBN-28) crystal between 380 and 700 nm. The refractive index of Ca 0.28 Ba 0.72 Nb 2 O 6 are measured by the spectroscopic ellipsometry. The dispersion curves were fitted to different Sellemeier functions. The normal dispersions were observed. Using the interference of polarized light, the birefringence in the long wavelength region is obtained. The results are in good agreement with the reference. A new technique was used to analysis the experiment data and this technique is proved to be more simple and efficient.

“…The kink at 359nm is caused by a lamp change. [5]. Figure 3 shows the interference pattern in the transmittance spectrum.…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Refractive index dispersion and anisotropy in Ca0.28Ba0.72Nb2O6

Zhang¹,

Lian

Wang

et al. 2006

“…It is quite clear from the plot that the birefringence value lies in the range 0.16 to 0.06 in the wavelength range of 5300 -6900 Å indicating ZTS is more (0.16) birefringent than KDP (0.10) [17,18]. …”

Section: Measurement Of Birefringencementioning

confidence: 91%

Crystal growth, thermal, optical and microhardness studies of tris (thiourea) zinc sulphate ‐ a semiorganic NLO material

Ramajothi

Dhanuskodi²,

Nagarajan

2004

129

Tris (thiourea) zinc sulphate (ZTS), a semiorganic nonlinear optical (NLO) material has been synthesized at 30°C. The solubility was determined in different solvents such as water, ethanol and water mixture of ethanol (1:1). Good quality single crystals with size 10 x 8 x 6 mm 3 were grown by slow evaporation technique within three weeks with approximate growth rate of 0.5 mm/day. The grown crystals have been subjected to single crystal X-ray diffraction to determine the unit cell dimensions and morphology. The TGA and DTA reveal that the material has good thermal stability. The UV-Vis spectrum shows that the material has wide optical transparency in the entire visible region. The second harmonic generation was confirmed by Kurtz powder method. The birefringence of the crystal was measured in the visible region and it was found to vary with the wavelength. The microhardness test was carried out in (100) plane and the load dependent hardness was measured.

“…Birefringent materials are used as circulators, beam displacers and Glan polarisers [12][13][14]. The birefringence of L-HFB was measured using channel spectrum method with a high power halogen lamp (500W) as a source.…”

Section: Measurement Of Birefringencementioning

confidence: 99%

Crystal growth, thermal and optical studies of L‐histidine tetrafluoroborate: A semiorganic NLO material

Dhanuskodi

Ramajothi

2004

L-histidine tetrafluoroborate (L-HFB), a semiorganic nonlinear optical (NLO) material has been synthesized and characterized by elemental analysis and FT-NMR spectroscopic studies. Solubility of L-HFB has been determined in water and ethanol. The single crystals with dimensions 15x12x3 mm 3 were grown by slow evaporation technique under two different pH conditions. The effect of pH on the morphology of the crystals have been studied. The grown crystals of both pH values has been subjected to single crystal X -ray diffraction to determine the unit cell dimensions and morphology. The thermal stability has been analyzed by TGA and DTA. The microhardness test was carried out in (001) plane and the hardness coefficient was calculated. The birefringence values (∆ n ) were determined in the wavelength region 5540 -6460 Å.