Journal ArticleDOI
A simple laser interferometer.
About:
This article is published in Applied Optics.The article was published on 1969-04-01. It has received 26 citations till now. The article focuses on the topics: Twyman–Green interferometer & Interferometry.read more
Citations
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Patent
Grazing incidence interferometer and method
TL;DR: In this article, a two-beam interferometer illuminates a sample surface with light at grazing incidence angles for the purpose of analyzing a surface characteristic such as surface topography.
Patent
Method and apparatus for measuring temperature using infrared techniques
TL;DR: In this article, a method and apparatus for visibly outlining the energy zone to be measured by a radiometer is described, where a laser sighting device (12) is provided on the radiometer, adapted to emit at least one laser beam (14) against a surface whose temperature is measured, with said laser beam being positioned about the area to visibly outline said energy zone.
Journal ArticleDOI
All-Reflection Interferometer for Use as a Fourier-Transform Spectrometer*
TL;DR: In this paper, the authors describe the design and tests of an all-reflection two-beam interferometer using a combination of three diffraction gratings as a beam splitter.
Journal ArticleDOI
Split-and-delay Unit for FEL Interferometry in the XUV Spectral Range
Sergey Usenko,Andreas Przystawik,Leslie Lamberto Lazzarino,Markus A. Jakob,Florian Jacobs,Christoph Becker,Christian Haunhorst,Detlef Kip,Tim Laarmann +8 more
Abstract: In this work we present a reflective split-and-delay unit (SDU) developed for interferometric time-resolved experiments utilizing an (extreme ultraviolet) XUV pump–XUV probe scheme with focused free-electron laser beams The developed SDU overcomes limitations for phase-resolved measurements inherent to conventional two-element split mirrors by a special design using two reflective lamellar gratings The gratings produce a high-contrast interference signal controlled by the grating displacement in every diffraction order The orders are separated in the focal plane of the focusing optics, which enables one to avoid phase averaging by spatially selective detection of a single interference state of the two light fields Interferometry requires a precise relative phase control of the light fields, which presents a challenge at short wavelengths In our setup the phase delay is determined by an in-vacuum white light interferometer (WLI) that monitors the surface profile of the SDU in real time and thus measures the delay for each laser shot The precision of the WLI is 1 nm as determined by optical laser interferometry In the presented experimental geometry it corresponds to a time delay accuracy of 3 as, which enables phase-resolved XUV pump–XUV probe experiments at free-electron laser (FEL) repetition rates up to 60 Hz
Patent
Radiometer, sighting device for a radiometer and method therefor
Meinrad Goetz,Patrick Zahn,Andreas Derr,Herbert Rosenstiel,Uwe Haury,Wolfgang Schwoerer,Axel Richter,Martin Baecke +7 more
TL;DR: In this article, an IR detector, a lens and a light source are arranged with respect to the IR detector such that it focuses IR radiation from a measuring surface to the detector, and the light source emits visible light for marking the measuring surface.
References
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Journal ArticleDOI
Forty Years of History of a Grating Interferometer
TL;DR: In this paper, the effect of diffraction gratings on the path of a wave affected by any aberration is investigated from an interferential viewpoint and a wave theory of shadows is formulated.
Journal ArticleDOI
A laser unequal path interferometer for the optical shop.
TL;DR: The application of laser technology has been extended to optical shop testing by incorporating a cw, helium-neon gas laser in a package that houses a modified Twyman-Green interferometer, which can be used with a set of null lenses to qualify aspheric surfaces.
Journal ArticleDOI
Interferometer based on four diffraction gratings
F J Weinberg,N B Wood +1 more
TL;DR: An interferometer based on diffraction gratings, used over their whole area, and designed to overcome some of the disadvantages of the four-mirror Mach-Zehnder arrangement is described in this paper.
Journal ArticleDOI
Rough Surface Interferometry Using a CO 2 Laser Source
C. R. Munnerlyn,Milton Latta +1 more
TL;DR: The CO2 laser with a wavelength of 10.6 μm offers the necessary increase in wavelength, while it retains sufficient accuracy to make useful measurements on optically rough surfaces.
Journal ArticleDOI
A lateral wavefront shearing interferometer with variable shear.
Adolf W. Lohmann,Olof Bryngdahl +1 more
TL;DR: A lateral wavefront shearing interferometer, using two diffraction gratings as beam splitters in the Fraunhofer planes of two successive image forming systems, and a sine wave generator using a generator using an extended, polychromatic source is presented which is built on this principle.