An adaptive interferometer for optical testing

Optics & Laser Technology, 2004

A simple and cost e ective method for making holographic optics-based interferometer, which is suitable for performing optical test studies on phase (transparent) objects in real-time, has been described. The optical arrangement in the proposed method involves a very simple alignment procedure and inexpensive holographic recording material is used in the formation of holographic optical elements. Recording schemes for the formation of holographic optical elements and the related techniques for the realisation of the proposed interferometer along with typical experimental results have been presented. ?

18 May 1967 Eastman Kodak Report A-002055-MU A new interferometric optical testing technique has been found which shows promise in performing tests heretofore not possible with conventional interferometry. Some preliminary results are presented of an attempt to establish the fundamental feasibility of the new technique. With the new approach, a hologram is substituted for both the beam splitter and the reference mirror of a conventional interferometer (Williams, Twyman-Green, Mach-Zehnder, etc.)

2004

The paper describes different configurations for realization of a simple, compact and robust holographic optics based interferometer, which makes use of minimal bulk optical components. The optical arrangements in the proposed interferometer set-ups involve a very simple alignment procedure and conventional holographic recording material is used in the formation of holographic optical elements. Recording schemes for the formation of holographic optical elements and the related techniques for the realisation of three different interferometer set-ups along-with the experimental results have been presented. The proposed interferometer set-ups are quite suitable for performing optical test studies on phase (transparent) objects in real time.

Springer Series in OPTICAL SCIENCES, 2007

This chapter is a review of photorefractive crystals used in holographic interferometry, starting from the basics and early experiments up to devices achievement.

14 MAR 1967 Eastman Kodak Report F-013747-KU Five potentially applicable techniques of interferometric testing. with holography are discussed in the attachment. The configurations for each • technique are shown at the end of this letter. The first is a method of recording the wavefront from a test mirror M, in a hologram, and then latei using this recorded wavefront in an interferometric test. This configuration appears promising, in terms of its immediate applicability to optical and thermal/optical testing of both specular and diffusely reflecting spheres. The configuration is very much like that of a conventional Williams interferometer and should easily' be obtainable by a minor modification of a Williams breadboard. The second configuration indicates how one can make holograms with currently available interferometers without modification. The disadvantages of this technique make it anr unlikely prospect for immediate use. The third configuration is aimed at making and using holograms as corrector plates for optical systems. The potential of this technique is enormous. However, substantial developmental testing appears to be in order here. If this technique proves feasible it should have a far-reaching effect on the entire field of optical testing.

2004

A new scheme for making a simple, compact and cost-effective two-beam optical interferometer using a commercially available diffraction grating and a single plate holographic optical element is described. The procedure for the generation of holographic optical element using a diffraction grating and the related techniques to realize the proposed interferometer along with typical experimental results has been presented. The proposed interferometer is simple, works well with a single collimated beam, and is quite suitable for performing optical test studies on phase (transparent) objects in real-time.

2009

Holography is an attractive imaging technique as it offers the ability to view a complete three-dimensional volume from one image. However, holography is not widely applied to the regime of white-light imaging, because white-light is incoherent and creating holograms requires a coherent interferometer system. We review our recently proposed single-channel interferometer for generating digital Fresnel holograms of 3-D real-existing objects illuminated by incoherent light. In this motionless holographic technique, light is reflected, or emitted, from a 3-D object, propagates through a diffractive optical element (DOE), and is recorded by a digital camera. The DOE is used as beam-splitter of the single-channel incoherent interferometer, such that each spherical beam originated from each object point is split into two spherical beams with two different curve radiuses. Superposition of the entire interferences between all the couples of spherical beams creates the Fresnel hologram of the observed 3-D object. Three holograms are recorded sequentially, each for a different phase factor of the DOE. The three holograms are superposed in the computer, such that the result is a complex-valued Fresnel hologram that does not contain a twin image. When this hologram is reconstructed in the computer, the 3D

Applied Optics, 1998

We present novel, to our knowledge, methods for the analytical design and recording of planar holographic optical elements in thick materials. The recording of each planar holographic element is done by interference of two aspherical waves that are derived from appropriately designed computer-generated holograms such that the element has the desired grating function for minimizing aberrations and closely fulfills the Bragg condition over its entire area. The design and recording methods are described, along with calculated results of representative elements.

Optical Engineering, 2018

Interferometers using computer-generated holograms (CGHs) have become the industry standard to accurately measure aspheric optics. The CGH is a diffractive optical element that can create a phase or amplitude distribution and can be manufactured with low uncertainty using modern lithographic techniques. However, these CGHs have conventionally been used with visible light and piezo-shifting interferometers. Testing the performance of transmissive optics in the infrared requires infrared CGHs and an infrared interferometer. Such an instrument is used in this investigation, which introduces its phase shift via wavelength-tuning. A procedure on how to design and manufacture infrared CGHs and how these were successfully used to model and measure the Wide-Field Infrared Survey Telescope grism elements is provided. Additionally, the paper provides a parametric model, simulation results, and calculations of the errors and measurements that come about when interferometers introduce a phase variation via wavelength-tuning interferometry to measure precision aspheres.

2000

A compact holographic optics-based interferometer involving the use of minimal bulk optical components is described. The optical arrangement in the proposed system involves a simple alignment procedure, and conventional holographic recording material is used in the formation of holo graphic optical elements. Record- ing schemes for the formation of holographic optical elements and related techniques for the realization of the