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Malus Law Apparatus

Model: HO-ED-P-02

Holmarc's Malus Law Apparatus (Model No: HO-ED-P-02) helps to understand polarization properties of light. It can also be used to study the light intensity relation of polarizer-analyzer. This apparatus comprises of a diode laser (as a light source), a polarizer, an analyzer assembly and a pinhole photo detector with output measurement unit.

In this experiment, Malus law of polarization is verified by showing that the intensity of light passed through two polarizers depend on the square of cosine value of the angle between the two polarizer axis. Laser light is used in this experiment because it’s wavelength is almost completely extinguished by the crossed polarizers.

The laser beam travelling through a polarizer is observed as a function of the orientation of the polarizer. With a second polarizer (called analyzer) the relative orientation of the polarizers is determined. The transmitted light is measured by a photo detector and the Malus Law can be verified.



Experiment Examples

    Verification of Malus law

When completely plane polarized light is incident on the analyzer, the intensity I of the light transmitted by the analyzer is directly proportional to the square of the cosine of angle between the transmission axes of the analyzer and the polarizer ie,


I ∞ cos2θ



    To study the polarization properties of light

A graph between the orientations of the light intensity with respect to angle of transmission axis of the analyzer will follow the cos²θ function.



    To measure the light intensity of plane polarized light as a function of the analyzer position


Fig. Intensity Vs Polarization Angle


Fig. Photo detector current as a function of cos2θ


Fig. Photo detector current as a function of angular position of polarization plane of the analyzer

Features

    Holders with adjustable height and compatible in optical rail

    Graduated circular degree scale of analyzer and polarizer from 0 to 360°

    All components are made out of anodized aluminum and stainless steel to avoid corrosion

Related Topics

    Polarization by reflection

    Malus' Law

    Polarizer

    Analyzer
Scope of Supply


    Optical Rail

Model No: ED-P-02-OR
Length
:
500 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Optical Rail

    Kinematic Laser Mount

Model No: ED-P-02-KLM
Material
:
Black anodized Aluminum alloy
Adjustments
:
Using 80 tpi lead screws
AdjustmentRange
:
+/-4 degrees
Quantity
:
1 no.
Kinematic Laser Mount

    Polarizer Rotator with Mount

Model No: ED-P-02-PRM
Material
:
Sheet Polarizer
Rotation
:
360 degree
Resolution
:
1 degree
Quantity
:
2 nos.
Polarizer Rotator with Mount

    Detector Mount

Model No: ED-P-02-DM
Material
:
Black anodized Aluminum alloy
Diameter
:
30 mm
Quantity
:
1 no.
Detector Mount

    Diode Laser with Power supply (Red)

Model No: ED-P-02-DLPR
Wave length
:
650 nm
Optical power
:
3 mW
Quantity
:
1 no.
Diode Laser with Power supply (Red)

    Detector Output Measurement Unit

Model No: ED-P-02-DOMU
Sensor Type
:
Photo Transistor
Display
:
7 segment, 3 ½ digit
Range
:
0 - 199 milli / micro amperes
Quantity
:
1 no.
Detector Output Measurement Unit

    Accessories

User Manual

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