Determination of optical birefringence of S-benzylisothiouronium chloride and S-benzylisothiouronium nitrate using Cauchy’s two term model by the channelled spectrum method

Hemalatha, Pushparaj; Veeravazhuthi, V.; Nair, C Kumaran

doi:10.1016/j.optcom.2009.03.037

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The sample was placed between crossed polarizers and illuminated by the light of a halogen lamp. Next, two channeled spectra (Ellis & Glatt, 1950;Hemalatha et al, 2009) were obtained via a fibre-optic spectrometer for temperatures of 295 and 448 K in the spectral region of 450-800 nm. The interference spectral minima in the channeled spectra satisfy the well known relation Ánd = m, where m is the order of the interference fringes.…”

Section: Linear Birefringence and Electro-optic Effectmentioning

confidence: 99%

High-accuracy polarimetric studies on lead germanate single crystals

2021

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A high-accuracy polarimetric technique has been used for the characterization of a lead germanate ferroelectric single crystal. The measurement results of the linear and circular birefringence in the [010] direction at a wavelength of 633 nm under the influence of an electric field are presented. Gyration–electric field hysteresis loops at alternative crystal positions in the polarization system have been used to determine the ellipticity of the eigenwaves. A temperature dependence of the gyration tensor component g 11 in the temperature range of 300–450 K was found.

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Section: Linear Birefringence and Electro-optic Effectmentioning

confidence: 99%

High-accuracy polarimetric studies on lead germanate single crystals

2021

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“…However most of these techniques require expensive and highly sophisticated optical apparatus as well as a large volume sample [7]. Channeled spectra [8][9][10] resulting from twobeam interference were used for measuring the anomalous dispersion of various optical materials such as quartz and sapphire. In our work, a simple method, channel spectrum was used for measuring the absolute birefringence and its dispersion for constant an anisotropic material is presented.…”

Section: Introductionmentioning

confidence: 99%

Optical birefringence studies of thiourea complex crystals using Cauchy’s two term model by the channeled spectrum method

Kumar

Anand

Gunasekaran

et al. 2015

J Opt

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The channeled spectrum employing polarized light interference is a very convenient method for the study of dispersion of birefringence. This method was used for measuring the birefringence of semi organic single crystals of certain undoped and urea doped thiourea complexes viz., mercury chloride, thiourea magnesium chloride, thiourea mercury sulphate and thiourea magnesium sulphate crystals. Cauchy's two term formula was applied to fit the experimental data. The Cauchy's coefficients A and B were obtained by solving the linear equations using MATLAB and the value of birefringence was calculated. The study aims at identifying a best optical material from thiourea complexes with higher SHG efficiency.

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Enhanced Coplanarity and Giant Birefringence in Hydroxypyridinium Nitrate via Hydrogen Bonding between Planar Donors and Planar Acceptors

Yin,

Guo,

Huo

et al. 2024

Angewandte Chemie

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Birefringent crystals, which possess optical anisotropy, are important optical components. However, designing and synthesizing birefringent crystals faces the challenge of achieving anisotropic structures, especially coplanar geometries. Herein, we achieve a significant birefringence in an ionic compound (C5H6ON)+(NO3)–, (4‐hydroxypyridinium nitrate, 4HPN) by hydrogen bonding between planar donors and planar acceptors. We demonstrate that the interactions between the planar hydrogen bond donor ((C5H6ON)+) and planar hydrogen bond acceptor ((NO3)–) ensure the coplanarity during the crystal packing, generating the desired giant optical anisotropy. On two manually cut crystal chips, we observe a = 0.494 ( = 0.593), which is the largest among nitrates, or hydroxypyridinium derivatives. This value already surpasses those of the benchmark crystals, e.g., YVO4 and CaCO3, commonly used in the UV to visible and near IR spectral range. 4HPN also exhibits a strong second harmonic generation response (9.55 × KDP). This strategy offers a promising avenue for the design and development of birefringent crystals with potential applications in optical communication, sensing and signal processing devices.

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Determination of optical birefringence of S-benzylisothiouronium chloride and S-benzylisothiouronium nitrate using Cauchy’s two term model by the channelled spectrum method

Cited by 5 publications

References 11 publications

High-accuracy polarimetric studies on lead germanate single crystals

High-accuracy polarimetric studies on lead germanate single crystals

Optical birefringence studies of thiourea complex crystals using Cauchy’s two term model by the channeled spectrum method

Enhanced Coplanarity and Giant Birefringence in Hydroxypyridinium Nitrate via Hydrogen Bonding between Planar Donors and Planar Acceptors

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