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Faraday Effect Apparatus

Multi wavelength

Model: HO-ED-P-04B

Holmarc’s Faraday Effect Apparatus Model: HO-ED-P-05 is designed for the determination of Verdet’s constant of a material for multiple wavelengths of light. With its new and integrated design, this device is easier to setup and operate so that students can easily understand its principles and theories.

A glass rod (NSF57) with high refractive index is located on a U shaped laminated variable current electromagnet. 50W Halogen lamp is used as light source.5 Filters 404, 450, 505, 546 & 578nm used in filter assembly as narrow band monochromatic light. The sample is placed in a hole drilled pole piece in electromagnet. Sample with electromagnetic unit kept between two linear polarizers and a power meter is used to measure the light intensity as a function of the analyzer angle θ for a full rotation. Faraday Effect is a magneto optic effect in which the plane of linear polarized light is rotated as it passes through a medium that is placed in a magnetic field.



Experiment Examples

    Plot wavelength versus verdet constant graph at a constant current

θ  =  VB l, Where magnetic flux density B  =  µ0NI


For a given magnetic field and optical path length , Verdet constant will directly corresponds to optical rotation of plane of polarization of light. Verdet constant depends upon the medium its temperature and the frequency of light.



    Plot Varying current versus angle of rotation Δθ for a constant wavelength.

The angle of rotation depends upon the length of the sample, strength of the magnetic field & a proportionality constant called verdet constant.



Features

    Modern & user friendly design

    50W hg lamp as light source

    High quality Interference filters with filter wheel assembly provided

    U shaped laminated iron core copper winded electromagnet with DC socket
    High refractive index glass rod specimen

    Hollow mode electromagnet pole pieces

    Photo detector with Power meter unit for null detection from analyser
Technical Characteristics

    Interference filters :     404, 450, 505, 546, 578nm
    Source :     Tungsten Halogen 50W
    Glass rod specimen :     Schott NSF57, 30mm length, 10mm diameter
    Electromagnet input voltage :     40V DC, 0 - 4A
    Analyzer precision :     1 degree / division
    Power meter :     Photo diode sensor, 2 - 20mW & µW
    Variable power supply :     0 - 4A, 40V DC
    Gauss meter :     0 - 2 Tesla range
Scope of Supply


Optical Rail
    Model No :     ED-P-04B-OR
    Length :     1000 mm
    Material :     Black anodized Aluminum alloy
    Quantity :     1 no.
Optical Rail
    Model No :     ED-P-04B-OR
    Length :     1000 mm
    Material :     Black anodized Aluminum alloy
    Quantity :     1 no.
Optical Rail
    Model No :     ED-P-04B-OR
    Length :     1000 mm
    Material :     Black anodized Aluminum alloy
    Quantity :     1 no.
Optical Rail
    Model No :     ED-P-04B-OR
    Length :     1000 mm
    Material :     Black anodized Aluminum alloy
    Quantity :     1 no.

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