title: Visibility enhanced interferometer based on an injection-locking technique for low reflective materials.
abstract: 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.
authors.affiliation: Center for Length and Time, Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon, 305-340, Korea. jonghan@kriss.re.kr
authors.forename: Jonghan
authors.initials: J
authors.lastname: Jin
authors.forename: Jae Wan
authors.initials: JW
authors.lastname: Kim
authors.forename: Chu-Shik
authors.initials: CS
authors.lastname: Kang
authors.forename: Jong-Ahn
authors.initials: JA
authors.lastname: Kim