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Fabry - Perot Interferometer

(CCD Based)

Model: HO-ED-INT-10A

Computer interfaced Fabry-Perot interferometer (Model No:HO-ED-INT-10A) is similar to projection type (model no:HO-ED-INT-10), apart from the fact that in this case, the interference pattern is captured by a CCD sensor and displayed on a computer monitor. The advantage of computer interface is that the pattern can be saved for future analysis. In addition, measurements can be taken directly from the monitor by using the software module provided.

In the etalon, distance between partially reflecting mirrors can be precisely varied in microns. One of the beam splitters can be kinematically adjusted for initial settings.


Experiment Examples

    To find the wavelength of monochromatic light

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 determine the spacing between the plates of fabry perot etalon from the fringe Pattern

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 (FSR) of etalon from the fringe calibration at different cavity thickness

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



Specification of etalon

    Spacing of Etalon    :    2 - 8mm

    Ratio R/T    :    80 / 20

    Aperture    :    25mm
Features

    Mercury vapor lamp is used as light source

    Compact design

    Fine tuning is possible in etalon

    High resolution CCD camera
Related Topics

    Interference of light

    Fabry Perot etalon

    Finesse of etalon
Scope of Supply


    Optical Rail

Model No: ED-INT-10A-OR
Length
:
500mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Optical Rail

    Fabri-Perot Interferometer

Model No: ED-INT-10A-FPI
Material
:
N-BK7
Diameter
:
25 mm
Coating
:
Aluminium
R / T
:
60 : 40
Spacing of plates
:
2 - 8mm variable
Least count of micrometer
:
0.01 mm
Quantity
:
1 no.
Fabri-Perot Interferometer

    Kinematic Laser Mount

Model No: ED-INT-10A-KLM
Material
:
Black anodized Aluminum alloy
Adjustments
:
Using 80 tpi lead screws
AdjustmentRange
:
+/-4 degrees
Quantity
:
1 no.
Kinematic Laser Mount

    Colour Filter Mount

Model No: ED-INT-10A-CFM
Material
:
Black anodized Aluminum alloy
Diameter
:
30 mm
Quantity
:
1 no.
Colour Filter Mount

    Plano Convex Lens with Mount Supply

Model No: ED-INT-10A-PCLM
Material
:
N-BK7
Diameter
:
30 mm
Effective Focal Length
:
26 mm
Quantity
:
1 no.
Plano Convex Lens with Mount

    Camera Lens Assembly with Mount

Model No: ED-INT-10A-CLAM
Material
:
N-BK7
Focal Length
:
65 mm
Quantity
:
1 no.
Camera Lens Assembly with Mount

    Colour Filters (Green, Blue)

Model No: ED-INT-10A-CF
Diameter
:
30 mm
Material
:
PMMA
Quantity
:
1 no. each
Colour Filters (Green, Blue)

    Diode Laser with Power supply (Red)

Model No: ED-INT-10A-DLPR
Wave length
:
650 nm
Optical power
:
5 mW
Quantity
:
1 no.
Diode Laser with Power supply (Red)

    CCD Camera

Model No: ED-INT-10A-CCDC
Resolution
:
Selectable (320-1280 pixels)
Connectivity
:
USB 2.0
Quantity
:
1 no.
CCD Camera

    Mercury Vapor Lamp with Power Supply

Model No: ED-INT-10A-MVPS
Input
:
230V, 50Hz
Quantity
:
1 no.
Mercury Vapor Lamp with Power Supply

    Accessories

Allen Key
User Manual

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