Interferometry
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
To determine wavelength of laser beam
The wavelength of laser is calculated by,
λ = ( 2d / N ) Δ
Δl = n. λ / 2
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.
Scope of Supply
Model No: ED-INT-12-BBS
Dimensions : 800 x 600 mm
Material : Stainless Steel
Quantity : 1 no.
Model No: ED-INT-12-KLM
Material : Black anodized Aluminum alloy
Adjustments : Using 80 tpi lead screws
Adjustment Range : +/-4 degrees
Quantity : 1 no.
Model No: ED-INT-12-BSM
Degrees of freedom : 2 degrees
Material : Black anodized Aluminium alloy
Quantity : 1 no.
Model No: ED-INT-12-MMT
Degrees of freedom : 3 degrees
Fine adjustments : Using 80 tpi lead screws
Material : Black anodized Aluminium alloy
Quantity : 1 no.
Model No: ED-INT-12-MMPT
Degrees of freedom : 3 degrees
Least count of the micrometer : 0.01 mm
Material : Black anodized Aluminium alloy
Quantity : 1 no.
Model No: ED-INT-12-RS
Resolution : 1° / division
Diameter : Black anodized Aluminium alloy
Quantity : 1 no.
Model No: ED-INT-12-SM
Dimension : 75 x 75 mm
Quantity : 1 no.
Model No: ED-INT-12-PC
Length : 10 cm
Pressure Range : 0 - 300 mm Hg
Quantity : 1 no.
Model No: ED-INT-12-MC
Diameter : 25 mm
Thickness : 6 mm
Material : Borofloat
Coating : Aluminium
Quantity : 2 nos.
Model No: ED-INT-12-BS
Dimension : 50 x 50 mm
Thickness : 4 mm
R / T ratio : 50 / 50
Material : N-BK7
Coating : Aluminium
Quantity : 1 no.
Model No: ED-INT-12-GS
Dimension : 75 x 25 mm
Thickness : 1 mm
Material : Float
Quantity : 5 nos.
Model No: ED-INT-12-DLPR
Wave length : 650 nm
Optical power : 5 mW
Quantity : 1 no.
Model No: ED-INT-12-DLPG
Wave length : 532 nm
Optical power : 5 mW
Quantity : 1 no.
Thumb Screws
Allen keys
Instruction Manual
Established in 1993, Holmarc Opto-Mechatronics Ltd manufactures variety of scientific and engineering instruments for research, industry and education.
ISO 9001:2015 Made in INDIA
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