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Interferometry


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Fabry - Perot Etalon
Model: HO-ED-INT-09
Price : $ 1,034.00

Holmarc's Fabry-Perot etalon is made of plate beamsplitters separated by 3mm distance. The beamsplitters are made by coating thin aluminum films on optically polished N-BK7 substrates. The reflecting surfaces are kept inside the assembly. The etalon has optical resonating properties similar to that of laser. A translucent screen is provided with vernier and needle to take the readings of the fringes directly.

Etalons transmit light as a series of periodic frequencies and their narrow bandwidth makes them well-suited for wavelength selection, measurement and line-narrowing. The properties of an etalon are largely determined by its thickness, index of refraction and the reflectivity of it’s surfaces. The finesse is a measure of the interferometer's ability to resolve closely spaced spectral lines.

An etalon is an optical interferometer in which a beam of light undergoes multiple reflections between two reflecting surfaces and it’s resulting optical transmission (or reflection) is periodic in wavelength. In other words, an etalon is a narrow band wavelength filter.

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Experiment

   To find the Spacing of the Etalon

The Spacing of the Etalon is given by,

t  =  nD2λ  /  χn2

where n is the order, ‘D ’ is the distance between the etalon and the screen, ‘λ’ is the wavelength of light used.

χn2  =  χm+n2  -  χm2

χm+n2 is the square of the radius of (m+n)th ring and χm2 that of mth ring.

   To find the Finesse and Free Spectral Range of the Etalon

The Free Spectral Range of the Etalon is given by,

FSR  =  c / 2t,

Where c is the speed of light in air and t is the spacing of the Etalon

The finesse is a measure of the interferometer's ability to resolve closely spaced spectral lines.

The finesse F is defined by the following equation.

F  =  π √R / ( 1-R )

Where, R is the reflectivity of surfaces

Fig. Fabry Perot etalon produces sharp interference peeks

Scope of Supply

Optical Rail

Model No: No: ED-INT-09-OR
Length : 1000 mm
Material : Black anodized Aluminum alloy
Quantity : 1 no.

Fabri-Perot Etalon

Model No: ED-INT-09-FPE
Material : N-BK7
Diameter : 32 mm
Coating : Aluminium
R / T : 60 : 40
Spacing of plates : 3 +/- 1 mm
Quantity : 1 no.

Kinematic Laser Mount

Model No: ED-INT-09-KLM
Material : Black anodized Aluminum alloy
Adjustments : Using 80 tpi lead screws
Adjustment Range : +/-4 degrees
Quantity : 1 no.

Plano Convex Lens with Mount

Model No: ED-INT-09-PCLM
Material : N-BK7
Diameter : 20 mm
Effective Focal Length : 26 mm
Quantity : 1 no.

Diode Laser with Power supply (Red)

Model No: ED-INT-09-DLPR
Wave length : 650 nm
Optical power : 5 mW
Quantity : 1 no.

Diffuser Screen with Measurement unit

Model No: ED-INT-09-DSM
Material : Float
Size : 150 x 138 x 3 mm
Quantity : 1 no.

Accessories

Allen Key
Tuning Knobs
Instruction Manual

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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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   +91 920-719-7772 / 6 / 1
   sales@holmarc.com
   Mon - Sat : 9 am to 5 pm

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