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.

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.

Kinematic Laser Mount

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

Colour Filter Mount

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

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.

Camera Lens Assembly with Mount

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

Colour Filters (Green, Blue)

Model No: ED-INT-10A-CF
Diameter
:
30 mm
Material
:
PMMA
Quantity
:
1 no. each

Diode Laser with Power supply (Red)

Model No: ED-INT-10A-DLPR
Wave length
:
650 nm
Optical power
:
5 mW
Quantity
:
1 no.

CCD Camera

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

Mercury Vapor Lamp with Power Supply

Model No: ED-INT-10A-MVPS
Input
:
230V, 50Hz
Quantity
:
1 no.

Accessories

Allen Key
User Manual