Mach Zehnder Interferometer

Model: HO-ED-INT-12

Interferometer is built by assembling the building blocks on a breadboard as per desired optical layout. Optics and laser head are held using kinematic mounts with two axis fine adjustment facility. Precision alignments for obtaining the interference fringes are done using kinematic mounts.

One of the simplest experiments using the interferometer is measurement of index of refraction of air with an airtight test cell placed in one of the optical arms of the interferometer. No other factor such as convective airflow, should be present, that can generate optical path differences. The flexibility in fringe localization is one of the important advantages of the mach zehnder interferometer over other interferometers. Although many Mach-Zehnder interferometers use a rectangular arrangement, parallelogram arrangements are also possible. Vibration isolated supports for optical table is optional.

Experiment Examples

To determine wavelength of laser beam.

The wavelength of laser is calculated by,

λ  =  ( 2d / N ) Δ

where 'd' is the change in position that occurs for 'N' fringes to pass and Δ is the calibration constant of the micrometer.

To find refractive index of a transparent material.

The light passes through a greater length of glass as the plate is rotated. The change in the path length of the light beam as the glass plate is rotated and relates the change in path length with the laser beam through air.

The refractive index of glass slide,

N  =  ( 2t - Nλ ) ( 1 - cosθ )  /  2t ( 1 - cosθ )  -  Nλ

Where t is the thickness of the glass slide, N is the number of fringes counted, λ is the wave length of light used and θ is the angle turned for N fringes.

To study refractive index change in air under different pressures and determine refractive index of air.

When a piece of material of thickness d is placed in one arm of the Michelson Interferometer, the change in optical path length is given by 2dn where n is the difference in refractive index between the sample and the material it replaced (usually air). In other words, 2d (nm - nair ) / λ extra wavelengths are introduced if air is replaced by a sample of refractive index nm.

Features

Kinematic mounts are used for fine movement of optical components

Diode laser is used as light source

All materials used in this setup are of laboratory grade with corrosion resistance

The optics used in this device are of research quality
Related Topics

Interference of light

Constructive Interference

Destructive interference

Wavelength of light

Refractive index
Scope of Supply

Model No: ED-INT-12-BBS
Dimensions
:
800mm x 600mm
Material
:
Stainless Steel
Quantity
:
1 no.

Kinematic Laser Mount

Model No: ED-INT-12-KLM
Material
:
Black anodized Aluminum alloy
:
:
+/-4 degrees
Quantity
:
1 no.

Beamsplitter Mount

Model No: ED-INT-12-BSM
Degrees of freedom
:
2 degrees
Material
:
Black anodized Aluminium alloy
Quantity
:
1 no.

Mirror Mount with Translation

Model No: ED-INT-12-MMT
Degrees of freedom
:
3 degrees
:
Material
:
Black anodized Aluminium alloy
Quantity
:
1 no.

Mirror Mount with Precision Translation Supply

Model No: ED-INT-12-MMPT
Degrees of freedom
:
3 degrees
Material
:
Black anodized Aluminium alloy
Least count of the micrometer
:
0.01 mm
Quantity
:
1 no.

Rotation Stage

Model No: ED-INT-12-RS
Resolution
:
2° / division
Material
:
Black anodized Aluminium alloy
Quantity
:
1 no.

Screen with Mount

Model No: ED-INT-12-SM
Dimension
:
75mm x 75mm
Quantity
:
1 no.

Pressure Cell

Model No: ED-INT-12-PC
Length
:
10 cm
Pressure Range
:
0 - 300 mm Hg
Quantity
:
1 no.

Mirror with Cell

Model No: ED-INT-12-MC
Diameter
:
25 mm
Thickness
:
6 mm
Material
:
Borofloat
Coating
:
Aluminium
Quantity
:
2 nos.

Beamsplitter

Model No: ED-INT-12-BS
Dimension
:
50 mm x 50 mm
Thickness
:
4 mm
R/T ratio
:
50 / 50
Material
:
N-BK7
Coating
:
Aluminium
Quantity
:
2 nos.

Glass Slide

Model No: ED-INT-12-GS
Dimension
:
75 mm x 25 mm
Thickness
:
1 mm
Material
:
Float
Quantity
:
5 nos.

Diode Laser with Power supply (Red)

Model No: ED-INT-12-DLPR
Wave length
:
650 nm
Optical power
:
5 mW
Quantity
:
1 nos.

Diode Laser with Power supply (Green)

Model No: ED-INT-12-DLPG
Wave length
:
532 nm
Optical power
:
5 mW
Quantity
:
1 nos.

Accessories

Allen Key
User Manual