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

Published

July 14, 2018

Author(s)

Margaret Z. Dominguez, Catherine Marx, Qian Gong, John Hagopian, Ulf Griesmann, James Burge, Dae Wook Kim

Abstract

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. An alternative to these CGHs would be infrared CGHs, which test the performance of transmissive optics in the infrared. These require an infrared interferometer. Such an instrument is used in this investigation, which introduces its phase shift via wavelength-tuning. This paper provides 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 (WFIRST) grism elements. Additionally, the paper provides a parametric model, simulation results and calculations of the errors that come about when interferometers introduce a phase variation via wavelength-tuning interferometry to measure precision aspheres.

Citation

Optical Engineering

Pub Type

Journals

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Keywords

Aspheric metrology, optical testing, computer generated hologram, infrared, wavelength-tuning, interferometry, grism, diffractive optical elements

Citation

Dominguez, M. , Marx, C. , Gong, Q. , Hagopian, J. , Griesmann, U. , Burge, J. and Kim, D. (2018), IR Computer Generated Holograms: Design and Application for the WFIRST Grism using Wavelength-Tuning Interferometry, Optical Engineering, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926023 (Accessed October 11, 2025)