Faraday Effect Apparatus

Multi Wavelength

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:

   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.

Specifications:

Interference filters	404, 450, 505, 546, 578 nm
Source	Tungsten Halogen 50W
Glass rod specimen	Schott NSF57, 3 0mm length, 10 mm 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

Features:

Modern & user friendly design

50W hg lamp as light source

High refractive index glass rod specimen

Hollow mode electromagnet pole pieces

High quality Interference filters with filter wheel assembly provided

U shaped laminated iron core copper winded electromagnet with DC socket

Photo detector with Power meter unit for null detection from analyser

Drawings: