Multi wavelength

Model: HO-ED-P-04B

The apparatus consist of a halogen lamp as the polychromatic light source, fitted with a condenser lens system, and a filter wheel which comes with five narrow band interference filters to get the precise wavelength. This is followed by a polarizer, an electromagnet with power supply, an analyzer with a mechanical rotator adjustment and a detector. A highly sensitive photo detector is used to measure the light intensity as a function of the analyzer angle for a full rotation.

When light passing through certain materials is exposed to a parallel magnetic field, a Faraday rotation occurs. Faraday rotation is a magnetooptical phenomenon that rotates the plane of polarization of light. This experiment is appropriate for sophomore, junior, or senior students in physics. Faraday Effect Multi wavelength Apparatus can be used to measure Verdet constants in solid samples at different wavelengths.

Experiment Examples

Faraday Effect is a magneto optical effect in which the plane of polarized light is rotated as it passes through a medium that is placed in a magnetic field.

To determine the angle of rotation as a function of the mean flux density at different wavelengths

Fig. Verdet’s Constant as a function of wavelength.
The ‘+’ points represent the measured values of Verdet’s Constant at different wavelengths

To calculate the corresponding Verdet constant of the given sample at different wavelengths

Using different color filters, the angle of rotation as a function of the mean flux density is determined.

The corresponding Verdet constant is calculated in each case using the relation,

V  =  θ  /  ( B.L )

from the slope of the graphs.

Verdet constant is evaluated as a function of the wavelength.

Faraday Effect is a magneto optical effect in which the plane of polarized light is rotated as it passes through a medium that is placed in a magnetic field. The amount of rotation is dependent on the amount of sample through which the light passes, strength of the magnetic field and proportionality constant called the Verdet's Constant.

i.e   θ  =  V l B

Strength of the magnetic field, B = πN I, where N - Number of turns per unit length of the coil, and I - current through the coil

Features

Modern and user friendly design

The optical filters are of high quality, in order to reduce the error while selecting the wavelength.

Scope of Supply

Optical Rail

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

Halogen source with power supply

Model No: ED-P-04B-HLPS
Voltage
:
12 V
Watts
:
.50 W
Quantity
:
1 no.

Filter wheel with interference Filters

Model No: ED-P-04B-FWIF
No. of filters
:
5 Nos
Filter change
:
Manual
Filter Type
:
Narrow band Interference Filters
Quantity
:
1 no.

Polarizer

Model No: ED-P-04B-PPR
Type
:
Sheet polarizer
Accuracy
:
2 degrees / division
Quantity
:
1 no.

Electromagnet with Mount

Model No: ED-P-04B-EMM
Center Cavity
:
10 mm
Total number of turns
:
2500 nos
Length of the coil
:
15 cm
Quantity
:
1 no.

Constant Current Power supply

Model No: ED-P-04B-CCPS
Input
:
230V 50Hz
Output Current
:
0 - 4 Amps
Quantity
:
1 no.

Glass rod specimen

Model No: ED-P-04B-GRS
Material
:
SF 57
Length
:
10 cm
Diameter
:
10 mm
Quantity
:
1 no.

Model No: ED-P-04B-ARM
Type
:
Sheet polarizer
Accuracy
:
1 degree / division
Quantity
:
1 no.

Detector Mount with X - Translation

Model No: ED-P-04B-DMX
Material
:
Black anodized Aluminum alloy
Travel
:
Micrometer controlled
Resolution
:
0.01 mm
Diameter
:
30 mm
Quantity
:
1 no.

Collimating lens with mount

Model No: ED-P-04B-CLM
Focal length
:
60 mm
Diameter
:
50 mm
Quantity
:
1 no.

Detector Output measurement unit

Model No: ED-P-04B-DOMU
Detector Type
:
Si Photo diode
Input
:
230V AC / 50 Hz
Range
:
1 - 199 μA
0 - 199 mA
Quantity
:
1 no.