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Fizeau Interferometer

Model: HO-ED-INT-14

Fizeau Interferometer is one of the simplest and most versatile interferometers and is popular for routine measurements of both flat and spherical surfaces. It is used to measure optical components such as flats, prisms, lenses, or precision metal parts such as bearings, sealing surfaces or polished ceramics. Measurements can be made by using the static fringe analysis software.

The Holmarc Fizeau interferometer (model no:HO-ED-INT-14) basically comes with high optical quality (λ/20) reference flat. The reflection from the test surface interferes with the reflection from reference flat, producing fringes. The shape and quality of the fringes depends on surface quality of the test flat. The fringes are digitalized using a high resolution CCD camera. By analyzing the fringes, we can obtain the P-V flatness, RMS flatness, 3D surface plot etc. The instrument is built upright to fix the test sample easily. The tip /tilt test base allows the test sample to align with the reference surface. High quality aberration corrected optical design enhances performance.

Experiment Examples

    To measure the optical flatness of different surfaces

The refractive index of the solid prism using the formula,

n    =    sin  ( (α+β) / 2 )   /   sin (α/2)

Where α is angle of the prism & β is angle of minimum deviation.


Specifications

    Sample size    :    ≤ 100 mm

    Reference flat    :    λ/20 P V 100 mm diameter 25 mm thickness

    Accuracy    :    ≤ λ/20 PV

    Laser source    :    DPSS 5.0 mW 532 nm

    Alignment    :    By Tip / tilt sample base

    Camera    :    CCD Res. 1280 x 1024

    Analysis    :    Using fringe analysis software

    Weight    :    Approx. 25Kg

    Power supply    :    220V, 50Hz

Fig. Basic layout of the Fizeau interferometer

Features

    High precision flatness measurement is possible

    Static fringe analysis software is used

    The instrument is built upright, so the test sample can be fixed easily

    High quality aberration corrected optical components are used


Related Topics

    Optical flatness

    P-V flatness

    RMS flatness

    Interferogram

    Strehl ratio
Scope of Supply


    Fizeau Interferometer

Model No: ED-INT-14-FI
Height
:
1200 mm
Base
:
400 mm x 300 mm
Specification
:
As shown above
Quantity
:
1 no.
Fizeau Interferometer

    Spatial filter Assembly

Model No: ED-INT-14-SPA
Magnification
:
60 X
Pinhole Size
:
5 micron
Quantity
:
1 no.
Spatial filter Assembly

    Beamsplitter

Model No: ED-INT-14-BS
Material
:
Borofloat
Size
:
50 x 50 mm
R/T Ratio
:
50 : 50
Quantity
:
1 no.
Beamsplitter

    Achromat Doublet with Mount

Model No: ED-INT-14-ADM
Diameter
:
100 mm
Focal length
:
500 mm
Quantity
:
1 no.
Achromat Doublet with Mount

    Reference Flat with Mount

Model No: ED-INT-14-RFM
Material
:
Fused Silica
Diameter
:
100 mm
Quantity
:
1 no.
Reference Flat with Mount

    Test Flat with Mount

Model No: ED-INT-14-TFM
Material
:
Borofloat
Diameter
:
100 mm
Quantity
:
1 no.
Test Flat with Mount

    Camera Lens Assembly

Model No: ED-INT-14-CLA
Focal length
:
65 mm
Quantity
:
1 no.
Camera Lens Assembly

    DPSS Laser

Model No: ED-INT-14-DPSL
wavelength
:
532 nm
Output power
:
5 mW
Quantity
:
1 no.
DPSS Laser

    CCD Camera

Model No: ED-INT-14-CCDC
Resolution
:
1280 x 1024 pixels
Quantity
:
1 no.
CCD Camera

    Accessories

User Manual
Allen Key
Software CD

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