We describe a new interferometer designed to obtain high immunity to vibration by generating the reference wave by means of fiber diffraction so as to share a common path with the measurement wave. A spatial phase shifter is added to secure vibration desensitization by capturing four phase-shifted interferograms simultaneously without time delay. Experimental results prove that the proposed interferometer is capable of providing stable measurements with a level of fringe stabilization of less than 1 nm in a typical workshop environment equipped with no excessive ground isolation for antivibration.
© 2005 Optical Society of America
(050.1940) Diffraction and gratings : Diffraction
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
Hagyong Kihm and Seung-Woo Kim, "Fiber-diffraction interferometer for vibration desensitization," Opt. Lett. 30, 2059-2061 (2005)