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Multi-field merit-function-based regression method for Wide Field Infrared Survey Telescope grism system alignment.

Margaret Z Dominguez, Hyukmo Kang, Seonghui Kim

    Applied Optics
    |September 11, 2019
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    Summary

    A new alignment technique using a grating prism (grism) on the Wide Field Infrared Survey Telescope improves efficiency and accuracy. This method optimizes wavefront measurements for surveying emission-line galaxies.

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    Area of Science:

    • Astronomy and Astrophysics
    • Optical Engineering

    Background:

    • The Wide Field Infrared Survey Telescope (WFIRST) utilizes a grating prism (grism) for slitless spectroscopy.
    • Accurate opto-mechanical alignment is crucial for the grism's performance in surveying emission-line galaxies.

    Purpose of the Study:

    • To develop and validate an efficient and accurate alignment technique for the WFIRST grism.
    • To optimize wavefront measurements across a wide field of view.

    Main Methods:

    • Fabrication of a six-degree-of-freedom alignment element with fiducials and integral flats.
    • Wavefront measurement using an infrared interferometer across a 20x14 degree field of view.
    • System alignment guided by modeling that identified the most sensitive element (E2) to wavefront error.

    Main Results:

    • The developed alignment technique demonstrated higher efficiency and accuracy compared to conventional methods.
    • The merit function regression method was verified as superior for wide field of view alignment.
    • Identification of the E2 element as critical for minimizing grism wavefront error.

    Conclusions:

    • The proposed alignment method significantly enhances the precision of the WFIRST grism.
    • This advancement facilitates more effective surveys of emission-line galaxies.
    • The study validates a novel approach for complex optical system alignment.