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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 »

June 13, 2016 S100|HR Introduced at Optatec

S100|HR Fizeau Interferometer Introduced The new S100|HR laser Fizeau interferometer was introduced at the Optatec tradeshow in Frankfurt Germany this past week. We are excited by the industry’s response to a high-performance system offered at a fair price, and the continued interest in interferometer upgrades. The S100|HR was displayed measuring in the vibration insensitive mode and… read more »

April 16, 2016 Vibration Tolerant Interferometry

This blog post discusses improvements in phase shifting algorithms for increased accuracy. From the earliest days of phase shifting interferometry (PSI) phase ripple has been a problem. Ripple in the phase data follows the live fringe pattern but with twice the fringe frequency (ripple with the same frequency as the fringes can also appear and… read more »

April 6, 2016 Fizeau Interferometer: Buy or Upgrade; what are the purchasing options?

Fizeau Interferometer Buyers Guide 9 This blog is about the performance and price options for laser Fizeau interferometers Up to this point we have been discussing how various applications require specific interferometer sensor configurations and features. Now comes the key point when you need to do something. Do you need increased production capacity? Has a new… read more »

March 23, 2016 Measuring Thin Parallel Plates – Buyers Guide Chapter 8

In this blog the measurement of thin parallel plates with a Fizeau interferometer is discussed. Filters, etalons and plane parallel components exhibit reflections from the front and back surface rendering them impossible to measure in a standard laser Fizeau interferometer. A standard interferometer uses a laser, making interference easy to create, no matter the interferometer… read more »

March 7, 2016 Measuring Steep Sphere and Asphere Surfaces – Buyers Guide Chapter 7

In this blog the measurement of steep spheres and aspheres with a Fizeau interferometer is discussed. Steep Convex Spheres – Stitching A limitation of Fizeau interferometry is the inability to measure steep convex spheres with f#’s beyond the reference surface f#. This is a severe limitation for spot polishing machines that require data across the entire… read more »

February 23, 2016 Photonics West 2016

Zygo® GPI™ Upgrades Introduced At Photonics West we introduced a new product, upgrading Zygo® GPI™ and Mark IV™ interferometers. This also includes the VeriFire™ line of interferometers. All these system are basically the same with minor variations and which we can accommodate. We are pleased by the growing excitement about our ÄPRE REVEAL™ software. Its backward compatibility… read more »

February 23, 2016 Harsh Environment Testing: Optical Towers and In-situ Metrology – Buyers Guide Chapter 6

In this blog measurement of optics in a harsh environment with a Fizeau interferometer is discussed. For large systems, typically telescopes, vibration and air turbulence hinder or prevent the measurement phase by temporal phase shifting. Also interferometers placed on machine tools to measure in situ experience a vibrating environment. When vibration and turbulence hinder measurement then only a… read more »

February 9, 2016 Spot Polished Spherical and Flat Optical Components – Buyers Guide Chapter 5

In this blog the measurement of spherical and flat optics with a Fizeau interferometer that have been spot polished is discussed. Spot polishing machines for rapid manufacture of standard and high accuracy spheres place new requirements on interferometer systems. The spot polishing method can create small ripple in the surface while shaping the overall form. Accurate… read more »

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