Model 4HP Phase Interferometer



  Dual Wavelength

  Grazing Incidence
  Phase+ Adapter

  Phase Tutorial


  Printable PDF File

This 4-inch aperture Horizontal Phase Interferometer is configured for Plano work.  Note that for spherical work, our Model 4HPS is recommended. 

No need to buy a transmission flat for Plano work though -- the 1/20 wave reference surface is included and forms an integral part of the collimator. 

Compact and sturdy, this rugged instrument is equally at home in the QC lab or in the optical fabrication shop. Provided with a remote control of Focus, Zoom, Iris and Intensity, the 4HP is user-friendly.  Since the operator's hands rarely need to touch the interferometer -- it's a great time saver too!

4-inch aperture (101.6 mm) Ideal for test pieces from 1/2 inch to 4 inches diameter
1/20 wave fused silica reference surface High accuracy
Proprietary Optics for superior performance Highest contrast and cleanest interferogram of any interferometer available today. No bull's-eye aliases.
Rugged construction High mechanical stability
A Turnkey System User Friendly and ready to go
Horizontal Orientation Accessories available, please inquire
Two spot alignment For quick setup on each new part tested
Single Mode Diode  Laser source (635 nm) Dithered for Sharp, speckle-free images
Zoom Optics (4X) Readily accommodates test pieces from 1/2 inch to 4 inches diameter
Remote controlled Zoom, Focus, Iris, and illumination Intensity For quick adjustments
EndoPhazeTM Phase Shifter For smooth hysteresis-free phase shifting.
CCD Camera 768(H) x 494(V) pixels High resolution
Durango Universal Interferometry Software* Windows environment**
PV and rms in users choice of units
High level of repeatability
Excellent reproducibility
Large choice of graphic displays
Dynamic Sections
3-D OPD Plot
Reference Subtraction
MTF and PSF graphics and plots
Zernike Polynomials available for all measurements
Seidel Coefficients available
3.02 GHz computer with INTEL® Core™ i-3 540 processor For high speed data reduction and phase shift control
22-inch TFT Flat Screen Monitor For easy viewing
Live interferogram on computer monitor For quick inspection with no extra video monitor
Reference surface is an integral part of the interferometer. No need to purchase a separate Transmission Fat.
Reference surface aligned to collimator No need to adjust tip /  tilt of a Transmission flat.
High Accuracy  1/20 wave (uncalibrated) 
1/100 wave (calibrated)
Repeatability 1/300 wave PV   1/1000 wave rms
Reproducibility Excellent
Data Acquisition time 30 milliseconds (typical) Fast
Data reduction time ? 3 seconds (typical) Fast
Dimensions (L x W x H) 19 x 14 x 7.9 inches Small footprint
Weight 60 pounds Solidly built
Power 117 V 60 Hz 2 A (or 240 V 50 Hz 2A) Wired with plug to suit the user's power source
Manual Illustrated Operator's Manual
Warranty Standard one-year limited warranty against defective components or workmanship
Graham Optical Systems 9530 Topanga Canyon Blvd., Chatsworth California 81311
For further information please call Gordon Graham at (818) 700-1263    E-mail
  *Durango is a Trademark of Diffraction International       **Windows is a trademark of Microsoft
Copyright © 2011 Graham Optical Systems  All Rights Reserved 
EndoPhazeTM is a trademark of Graham Optical Systems         This page last updated November 25, 2011