Abstract
Magneto-optic effect is a phenomenon in which an electromagnetic wave propagates through a medium and gets affected by the presence of a quasistatic magnetic field. Verdet constant describes the strength of Faraday Effect for a particular material. The objective of this work was to measure the Verdet constant for different transparent materials. The Verdet constant is measured by using the Faraday Effect which is a magneto-optical phenomenon; mean it describes the rotation of the plane of polarization of light with in a medium when it is placed in an external magnetic field. So this experiment determines the rotation of the plane of polarization with respect to the wavelength and the magnetic field. The experiment was carried out with different materials like flint glass, potassium iodide, potassium bromide, olive oil, glycerin, normal water and salty water. Reading observed through this experiment depicts a linear relationship between the angle of rotation and the magnetic field. The Verdet constant is determined to be at constant laser wavelength λ = 632.8nm. This effect was demonstrated in olive oil and water and value of Verdet constant be V=16.18 radian/T-m and 24.68 radian/T-m respectively and also show optical activity for glycerin. However, no change was noticed for black glass and salty water.
Highlights
The phenomenon of Faraday Effect was first discoveredMichael Faraday in 1845
For performing experiment with flint glass, one requires a very strong magnetic field to rotate the plane of polarization of light
The materials used in present investigations are: Glycerin, Olive Oil, Water, Salty water and Potassium bromide (KBr)
Summary
The effect occurs when a plane polarized light passes through a thickness of a transparent medium This effect is limited to optically active materials, and included some optically inactive materials placed in high magnetic fields. The. Faraday Effect is caused by left and right circularly polarized wave propagating at slightly at different speed, a property known as circular birefringence. Faraday Effect is caused by left and right circularly polarized wave propagating at slightly at different speed, a property known as circular birefringence It occurs as an internal property of material when placed in external magnetic field. The direction of polarization, rotation depends on the properties of material through which the light is passed This effect is widely used in optical isolators, phase modulators, spin dynamics, etc. Faraday rotators can be used for amplitude modulation of light, and are basis of optical isolators and optical circulators; such components are required in optical telecommunications and other laser applications
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