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March 7, 2018 Laser Fizeau Interferometer History

The laser Fizeau interferometer has experienced several transformations from its original design. Like all evolutionary processes, some vestigial design elements remain in commonly used interferomters, which do not address and can impede measurements required to control and optimize today’s optical manufacturing processes. Circa 1850: Fizeau Interferometer Armand Hippolyte Louis Fizeau (1819 – 1896)  invented the… read more »

September 11, 2017 International Optics Participation at Eclipse 2017

Casper, WY USA, August 21, 2017 by Bob Smythe Telescopes and amateur astronomy are hobbies for many optical professionals. Observing a total eclipse is a peak experience for any astronomer, as it dramatically gives a fleeting glimpse of the solar corona and a sense of the precision motions of the solar system. My first and… read more »

September 11, 2017 China International Optoelectronic Exposition (CIOE)

  The China International Optoelectronic Exposition (CIOE) is the world’s largest exhibition serving the optics & photonics industry. 2017 was Äpre Instruments first occasion to actively participate and exhibit at CIOE. With more than 60,000 visitors attending CIOE over the four days of the exhibition, booth traffic was heavy every day and there was tremendous… read more »

July 25, 2017 Laser Munich 2017

Don Pearson, our VP Sales and Jan Posthumas, of LaserPeak (ÄPRE Representative) presented ÄPRE’s S100|HR interferometer in Munich this June. Once again we were pleased to meet with, and make new friends while co-exhibiting with the PTB’s HLEM (Hi-Level Experts Meeting) group. Presented was the S100|HR, part of ÄPRE’s S-Series interferometers with diffraction limited imaging… read more »

February 12, 2017 Photonics West 2017 Introductions

It was great to meet many new and old friends in San Francisco at Photonics West. Tradeshows give all of us an opportunity to discuss the challenges and opportunities facing us and discovering how working together we can help each other. Photonics West was no exception. This year we introduced the latest member of ÄPRE, Don… read more »

December 14, 2016 Piotr Szwaykowsky’s APOMA Presentation

Rarely are errors due to the interferometer itself considered when measuring optics with a laser Fizeau interferometer. Piotr gives examples of common and significant errors generated in the interferometer. Click to download his presentation with notes here. Let us know what you think! Retrace Errors Below is just an example of the error sources explored in Piotr’s presentation  

December 13, 2016 ÄPRE Laser Focus World Article Published

This month (November 2016) Laser Focus World published our paper “Three Simple Tests to Assess Interferometer Performance“. Let us know what you think. Also get Äpre’s test target that is required to assess the imaging performance of your interferometer. Results of the Retrace Error Test in a Generation II Interferometer Shown here is a Generation II… read more »

December 13, 2016 Interferometer Imaging Test Target

ÄPRE is offering a free interferometer image resolution test target. The target is simple to use without requiring complicated and expensive phase stepped optics. Simply place the 1-cycle/mm test target in front of your interferometer and look at its image on your camera. If you cannot see these lines, you cannot measure surfaces to these… read more »

September 7, 2016 Fizeau Interferometer: Fringes? Waves? Measured? Displayed?

The basic interferometry units of Fringe and Waves can get confused. This confusion leads to out of specification parts shipping and good parts scraped. This blog addresses fringes versus waves. Examples reference ÄPRE REVEAL software, similar controls are available in other interferometer analysis software. Note In this text we will use the terms “display fringes”… read more »

June 28, 2016 Fizeau Interforometer: To Zoom or Not to Zoom…

In this blog we explore the camera array size required to accurately measure Zernike polynomials in a laser Fizeau interferometer, and thus determine when a zoom system is important. (Hint: Zoom is a historical artifact) Is a Zoom System Required? Recently we were asked to provide a system with 4X zoom imaging to accommodate a 25… read more »

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