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Search Publications by: Ulf Griesmann (Fed)

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Displaying 1 - 25 of 70

Binary Pseudo-Random Array for Calibration of Interferometers with Transmission Spheres and Cylinders

September 30, 2024
Author(s)
Ulf Griesmann, Keiko Munechika, Simon Rochester, Weilun Chao, Carlos Pina-Hernandez, Kaito Yamada, Michael Biskach, Peter Takacs, Valeriy Yashchuk
Binary pseudo-random array (BPRA) "white noise" artifacts are highly effective for characterizing the instrument transfer function (ITF) of surface topography metrology tools and wavefront measurement instruments. These BPRA artifacts feature all spatial

Characterization of Surface Texture-Measuring Optical Microscopes using a Binary Pseudo-Random Array Standard

October 3, 2022
Author(s)
Ulf Griesmann, Keiko Munechika, Thomas Renegar, Xiaoyu Zheng, Johannes Soons, Weilun Chao, Ian Lacey, Carlos Pina-Hernandez, Peter Takacs, Valeriy Yashchuk, Thomas Germer
Accurate topography measurements of engineered surfaces over a wide range of spatial frequencies are required in many applications. The instrument transfer function (ITF) of the microscope used to characterize the surface topography must be taken into

Manufacture of Extremely Flat 300 mm Silicon Wafers

October 12, 2021
Author(s)
Marc Tricard, Paul Dumas, Christopher Hall, Ulf Griesmann, Quandou (. Wang
The flatness requirement for silicon wafers at the exposure site will be lower than 50 nm by 2010 and may be as low as 25nm by 2015 (TRS 2005). This creates new challenges for both wafer polishing and metrology tools capable of meeting the specifications

Modal Reconstruction of Aspheric Surfaces From Experimental Second Derivatives

October 12, 2021
Author(s)
Nadia Machkour-Deshayes, Byoung C. Kim, Robert S. Polvani, Ulf Griesmann
A method for the measurement of precise aspheric optical surfaces based on measurements of the second derivatives of the surface is evaluated. A compact phase-measuring interferometer is used to determine the second derivatives of a surface on a survey

Binary pseudorandom array test standard optimized for characterization of large field-of-view optical interferometers

August 24, 2020
Author(s)
Valeriy V. Yashchuk, Sergey Babin, Stefano Cabrini, Weilun Chao, Ulf Griesmann, Ian Lacey, Stefano Marchesini, Keiko Munechika, Carlos Pina-Hernandez, Allen L. Roginsky
Recently, a technique for calibrating the modulation transfer function (MTF) of a broad variety of metrology instrumentation has been demonstrated. This technique is based on test samples structured as one-dimensional binary pseudo-random (BPR) sequences

A Toolbox for Isophase-Curvature Guided Computation of Metrology Holograms

August 13, 2020
Author(s)
Ulf Griesmann, Johannes A. Soons, Gufran S. Khan
We describe the algorithmic foundations of an open-source numerical toolbox, written in the Octave language, for the creation of computer-generated binary and multi-level holograms used in interferometric form error measurements of complex aspheric and

Sensing Fabrication Errors in Diffraction Gratings using High Dynamic Range Imaging

July 19, 2019
Author(s)
Sofia C. Corzo Garcia, Johannes A. Soons, Ulf Griesmann
We describe the design of a simple instrument for the identification and characterization of fabrication errors in diffraction gratings. The instrument uses an uncooled charge-coupled device (CCD) camera and a high dynamic range imaging process to detect

Characterization and operation optimization of large field-of-view optical interferometers using binary pseudorandom array test standards

September 4, 2018
Author(s)
Valeriy V. Yashchuk, Sergey Babin, Stefano Cabrini, Ulf Griesmann, Ian Lacey, Keiko Munechika, Carlos Pina Hernandez, Quandou Wang
Recently, a technique for calibration of the Modulation Transfer Function (MTF) of a broad variety of metrology instrumentation has been established. The technique is based on test samples structured according to binary pseudo-random (BPR) one-dimensional

IR Computer Generated Holograms: Design and Application for the WFIRST Grism using Wavelength-Tuning Interferometry

July 14, 2018
Author(s)
Margaret Z. Dominguez, Catherine Marx, Qian Gong, John Hagopian, Ulf Griesmann, James Burge, Dae Wook Kim
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

Process improvements in the production of silicon immersion gratings

June 26, 2016
Author(s)
Cynthia Brooks, Benjamin Kidder, Michelle Grigas, Daniel Jaffe, Ulf Griesmann, Daniel Wilson, Richard Muller
We have explored a number of lithographic techniques and improvements to produce the resist lines that then define the grating groove edges of silicon immersion gratings. In addition to our lithographic process using contact printing with photomasks, which

Wide-Field InfraRed Survey Telescope (WFIRST) Slitless Spectrometer: Design, Prototype, and Results

June 26, 2016
Author(s)
Qian Gong, David Content, Margaret Z. Dominguez, Thomas Emmett, Ulf Griesmann, Jeffrey Kruk, Catherine Marx, Bert Pasquale, Thomas Wallace
The slitless spectrometer plays an important role in the WFIRST mission for the survey of emission-line galaxies. This will be an unprecedented very wide field, HST quality 3D survey of emission line galaxies1. The concept of the compound grism as a

Interferometric measurement of large sphere radii using holograms

July 8, 2015
Author(s)
Ulf Griesmann, Quandou (. Wang, Johannes A. Soons, Kate Medicus
We describe a new interferometric method for the measurement of large sphere radii in which the converging test beam is replaced by a pair of test beams with different focal lengths. The test beams are created by a pair of holograms that are fabricated on

Figure metrology for x-ray focusing mirrors with Fresnel holograms and photon sieves

June 20, 2014
Author(s)
Ulf Griesmann, Johannes A. Soons, Quandou (. Wang, Lahsen Assoufid
We report on interferometric measurements of the figure error of an ultra-precise mirror with the shape of an elliptical toroid for the diffraction limited focusing of hard x-rays from an undulator x-ray source. We describe measurement configurations using

A versatile bilayer resist for laser lithography at 405 nm on glass substrates

October 23, 2013
Author(s)
Quandou (. Wang, Ulf Griesmann
We describe a simple bilayer photoresist that is particularly well suited for laser lithography at an exposure wavelength of 405 nm on glass substrates, which is often used for the fabrication of binary diffractive optics and computer generated holograms

Holographic Radius Test Plates

September 7, 2013
Author(s)
Quandou (. Wang, Johannes A. Soons, Ulf Griesmann
We evaluate a method for testing the radius of spheres with a hologram that consists of a pair of nested Fresnel zone lenses. The hologram is positioned in the collimated test beam of a Fizeau interferometer. The inner zone lens generates a focus at the
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