+1 520.639.8195
2-in-1 Fizeau Interferometers: The S-Series
Switch between LONG & SHORT COHERENCE in less than 1 minute. You simply add capability with optional sources

STANDARD and HIGH Resolution Interferometers

LONG & SHORT COHERENCE without modification

One interferometer does it all. LONG COHERENCE, Laser, with standard Vibration Tolerant and Vibration Insensitive acquisition plus optional LASER wavelength shifting AND APRE’s patented easy to align, SHORT COHERENCE, Spectrally Controlled Interferometry also vibration tolerant. Switch between acquisition modes in <1 minute. S-Series grows with your requirements, to maximize performance and your investment


Fizeau interferometer performance is defined by how well it meets your needs, not esoteric parameters.
The S-Series balance optical, mechanical, electronic and software systems so  you get better products out the door faster


Image resolution indicates how small of a feature is measured. Today image resolution is important as mid-spatial frequencies, produced by modern CNC polishers, must be seen, measured and controlled. The S-Series HR and SR interferometers have diffraction limited imaging; going beyond simple camera pixels to total system performance.

The S-Series: The NEW definition of performance and value.

MAXIMIZED Fringe Resolution

Fringe resolution indicates how far a part can deviate from perfect and still be measurable. It is related to image resolution as a large optical system field stop supports high resolution imaging and large wavefront slopes that support high fringe resolution.

Start finish polishing or system alignment sooner: the S-Series maximizes fringe resolution.


Retrace Error occurs when fringes are viewed in the cavity. Such as when your part is not perfect or an operator leaves tilt fringes in the measured cavity, or when carrier fringe data acquisition is used.

The S-Series has nearly un-measureable retrace errors for improved accuracy user to user, day-to day.

LOW Image Distortion

Image distortion indicates if the measured feature is in the correct spot. A distorted image drives the CNC polisher to the wrong spot. All S-Series interferometers have <0.1% distortion.

The S-Series faithfully maps the surface without distortion.

MINIMIZED Image Field Curvature

Field flatness indicates the image can be focused from center to edge simultaneously. With a flat field the highest image resolution is maintained across your part.

The S-Series sees the same resolution across the entire part.

POWERFUL Data Analysis and Reporting

The best optics are nothing without software to match. Vibration tolerant acquisition, complete analysis of key parameters to ISO standards, and an often neglected requirement – flexible reporting specific to your needs and not resorting to screen grabs.

The S-Series is based on ÄPRE’s REVEAL™ software providing measurement to report in <10 seconds.

CONTACT USto Arrange a Demo Today

"I have been extremely impressed by Äpre... and look forward to continuing to work with Äpre in the future."

Ted K., Blue Ridge Optics
Need more help? CONTACT US
  • This field is for validation purposes and should be left unchanged.
+1 520.639.8195

© 2020 Äpre Instruments / All Rights Reserved. | Design by CleanClearCreative.com