A MODIFIED VISIBILITY ENHANCED INTERFEROMETER FOR MEASURING ROUGH SURFACES BASED ON AN INJECTION LOCKING TECHNIQUE

Jonghan Jin, Yong-Bong Lee, Jae Wan Kim, Jong-Ahn Kim, Chu-Shik Kang

Abstract

We have demonstrated a modified visibility enhanced interferometer based on an injection locking technique for measuring rough surfaces. Because a light is scattered by rough surfaces, the light reflected from samples in a measurement arm of the optical interferometer became weak. For enhancement of a visibility, optical intensity of the light reflected from the sample should be amplified as same as that reflected from a reference mirror. By using the injection locking technique, the weak light can be amplified while keeping the phase information. The proposed interferometer could enhance the visibility of the interference signal about 10 times.

Keywords

interferometer, visibility, rough surface, injection locking technique

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IMEKO-WC-2012-TC14-O11.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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