We propose and demonstrate a novel method to enhance the visibility of an optical interferometer when measuring low reflective materials. Because of scattering from a rough surface or its own low reflectivity, the visibility of the obtained interference signal is seriously deteriorated. By amplifying the weak light coming from the sample based on an injection-locking technique, the visibility can be enhanced. As a feasibility test, even with a sample having a reflectivity of 0.6%, we obtained almost the same visibility as a metal coated mirror. The suggested visibility enhanced interferometer can be widely used for measuring low reflective materials.
© 2010 OSA
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(140.3520) Lasers and laser optics : Lasers, injection-locked
Instrumentation, Measurement, and Metrology
Original Manuscript: September 14, 2010
Revised Manuscript: October 4, 2010
Manuscript Accepted: October 4, 2010
Published: October 25, 2010
, "Visibility enhanced interferometer based on an injection-locking technique for low reflective materials," Opt. Express 18, 23517-23522 (2010)
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