Interferometry
Holmarc's Lloyd’s single mirror experiment apparatus (Model No: HO-ED-INT-20) is an instrument that demonstrates how Lloyd’s single mirror can be used to obtain fringes due to interference and to calculate the wavelength of monochromatic light. A virtual image of the light source is created at the mirror through the reflection of the laser light. Interference pattern is produced due to the superposition of the direct and the reflected light.
The apparatus consists of an optical rail on which components are mounted using posts, post holders and movable carriages. For setting up the experiment, the light source, Lloyd’s mirror, expanding lens and imaging lens are adjusted so as to obtain well defined interference pattern. Laser diode is used as the light source. All components are made out of anodized aluminum and stainless steel to avoid corrosion.
Lloyd’s Mirror is used to produce two-source interference patterns. Let S is a diverging source of light, strikes at front surface of a mirror at a low angle. Some of the beam reflects from the mirror to the screen, and some shines directly on the screen. The reflected beam coming from a virtual source S₂ , superpose with the direct beam coming from source S₁. As a result of this we get interference pattern at on the screen.
Experiment
To find the wavelength of the laser beam
Wavelength of the laser beam is given by,
λ = d ( (f * B) / (b * b) )
Where,
λ = wavelength of laser beam
d = fringe spacing
B = Distance between two points on the screen
b = Distance between screen and lens
f = focal length of the imaging lens
Scope of Supply
Model No: HO-ED-INT-20-OR
Length : 1500 mm
Material : Aluminum alloy
Finish : Black anodized
Quantity : 1 no.
Model No: HO-ED-INT-20-KLM
Material : Black anodized Aluminum alloy
Adjustments : Using 80 tpi lead screws
Adjustment Range : +/-4 degrees
Quantity : 1 no.
Model No: HO-ED-INT-20-MMT
Material : Black anodized Aluminium alloy
Adjustment Range : +/-2 degrees
Quantity : 1 no.
Model No: HO-ED-INT-20-PCLM
Diameter : 25 mm
Focal length : 40 mm
Material : H-K9L
Quantity : 1 no.
Model No: HO-ED-INT-20-BCLM
Diameter : 50 mm
Focal length : 200 mm
Material : H-K9L
Quantity : 1 no.
Model No: HO-ED-INT-20-SM
Material : Float
Size : 150 x 138 x 3 mm
Quantity : 1 no.
Model No: HO-ED-INT-20-M
Size : 75 x 35 x 6 mm
Material : Borofloat
Coating : Protected aluminium
Quantity : 1 no.
Model No: ED-INT-20-DLPR
Wave length : 650 nm
Optical power : 5 mW
Quantity : 1 no.
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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H.M.T. P.O, Kalamassery, Kochi
Kerala, India - 683 503
+91 81369 44434
sales@holmarc.com
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