Phase-shifting diffraction-grating interferometer for testing concave mirrors

Tae-Joon Hwang; Seung Tai Kim

doi:10.1117/1.1625382

1 December 2003 Phase-shifting diffraction-grating interferometer for testing concave mirrors

Tae-Joon Hwang, Seung Tai Kim

Author Affiliations +

Optical Engineering, Vol. 42, Issue 12, (December 2003). https://doi.org/10.1117/1.1625382

Abstract

We present a new concept for a phase-shifting diffraction-grating interferometer, which is intended to test concave mirrors simply using a single reflective diffraction grating and fiber optic confocal microscope focusing optics. Our configuration allows generating a high-quality reference wave from a small active grating area that can be readily fabricated with good homogeneity of grating substrate and uniformity of groove spacing. The test and reference waves encounter no other optical components, so only a small active surface area of the grating affects the test result. The fiber optic confocal microscope design adopted to solve the alignment problem between the grating and the converging wave greatly reduces systematic errors of the interferometer. In addition, the phase-shifting capability provided by translating the grating using a microactuator enables one to attain nanometer accuracy in optical figure metrology.

©(2003) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Tae-Joon Hwang and Seung Tai Kim "Phase-shifting diffraction-grating interferometer for testing concave mirrors," Optical Engineering 42(12), (1 December 2003). https://doi.org/10.1117/1.1625382

Published: 1 December 2003

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