1 December 2005 Oblique fiber optic diffraction interferometer for testing spherical mirrors
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We present a new type of point diffraction interferometer that employs single-mode optical fibers instead of traditional pinholes. Two optical fibers with different exit endfaces are used; one is normally cut and the other obliquely cleaved. The normally cut fiber is used to generate a near-perfect spherical reference wave. The test wave is produced from the oblique fiber that performs two functions: generating a spherical wave to illuminate the test optics, and reflecting the test wave for common-path combination with the reference wave. The interferometer proposed in this investigation is found suitable for testing large size mirrors with a relatively simple overall hardware configuration.
© (2005) Society of Photo-Optical Instrumentation Engineers (SPIE)
Hagyong Kihm, Hagyong Kihm, Seung-Woo Kim, Seung-Woo Kim, "Oblique fiber optic diffraction interferometer for testing spherical mirrors," Optical Engineering 44(12), 125601 (1 December 2005). https://doi.org/10.1117/1.2148367 . Submission:

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