Piezo-optic birefringence in NaCl structure crystals. III

Ethiraj, R.; Bansigir, K. G.

doi:10.1107/s0567739473000410

Acta Cryst Sect A

1973

DOI: 10.1107/s0567739473000410

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Piezo-optic birefringence in NaCl structure crystals. III

R. Ethiraj¹,

K. G. Bansigir²

Abstract: Following the theoretical approach of Bansigir and Iyengar, an expression for the stress-optical coefficient q44 is developed. Using experimental values of q44, ionic polarizibilities of some ions are calculated. Also, the wavelengths at which q44 = 0 are evaluated for a few crystals. Both ionic polarizabilities and reversal wavelengths are found to be in good agreement with reported values.

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Strain-Optical Constant (p44) of Mixed Crystals of KCl-KBr of Equimolar Concentration

Kumar

Sudhakar

Ethiraj

et al. 1984

Phys. Stat. Sol. (a)

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Recently, Kumar et al. had determined the piezo-optic constants of mixed crystals of KCl-KBr /1/ and KBr-KI /2/. A theory of piezo-optic birefringence characterised by strain-optical constants (pll -q2) for mixed crystals of equimolar concentration of NaCl structure was developed by Kumar et al. /3/. This theory is now extended to the study of birefringence characterised by the constant p44 for mixed crystals of KC1-KBr of equimolar concentration and is valid for any mixed crystal having the same structure and composition.A crystal with its edges parallel t o DlO], .[OOl], and [11@ (to be called XI, y', and z', respectively) is stressed along ZI and observation is made along y' .The strain-optical constant p44 and induced refractive index changes are related to strain d through the following expression based on Pockel's theory /4/:where n is the refractive index in the unstrained condition, nxl and nzl are the altered refractive indices for light vibrating in x' and ZI directions.Attributing the changes in refractive indices to i ) change in density of the crystal, ii) Lorentz-Lorenz anisotropy due t o material continuum, iii) Lorentz-Lorenz anisotropy due t o dipoles within the assumed cavity, iv) Coulomb anisotropy due t o charges within the cavity, and following the same procedure as Kumar et al. /3/, an expression for the birefringence'was developed and is given by 1 ) Hyderabad 500 007, India.

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Strain-Optical Constant (p44) of Mixed Crystals of KCl-KBr of Equimolar Concentration

Kumar

Sudhakar

Ethiraj

et al. 1984

Phys. Stat. Sol. (a)

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Stress induced birefringence in alkaline earth fluorides

et al. 1984

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Evaluation of the true electro-optic effect in some doped KCl crystals

Ramesh¹,

Srinivasan²

1990

J. Phys.: Condens. Matter

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The strain-optic contribution to the electro-optic effect in KCl doped with Br-, Tl+, Cd2+ and Mn2+ ions has been evaluated from the independent measurements of the photoelastic and the electrostrictive coefficients and the true electro-optic coefficients have been calculated. The relatively small electrostrictive elasto-optic contribution in these doped KCl systems has been discussed in the light of the change in the ionicity of the bonds between the impurity ions and the Cl- ions. The possible application of the systems KCl:Cd2+ and KCl:Mn2+ at high (microwave) frequencies has been discussed in comparison with KTaO3.

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Piezo-optic birefringence in NaCl structure crystals. III

Cited by 3 publications

References 3 publications

Strain-Optical Constant (p44) of Mixed Crystals of KCl-KBr of Equimolar Concentration

Strain-Optical Constant (p44) of Mixed Crystals of KCl-KBr of Equimolar Concentration

Stress induced birefringence in alkaline earth fluorides

Evaluation of the true electro-optic effect in some doped KCl crystals

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