Method for studying a sample and optical interferometer for doing the same
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United States of America Patent
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Jan 31, 2006
Grant Date -
Sep 18, 2003
app pub date -
Feb 14, 2003
filing date -
Feb 14, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to the study of internal structure of objects by optical means. The invention presents a bi-directional sampling optical path for the low coherent optical radiation directed to the sample, i.e. a bi-directional sampling arm, and two unidirectional reference beams directed along a reference path designed as a loop. One of the reference beams propagates clockwise and the other propagates counterclockwise in the reference loop. The beam splitters non-reciprocal or polarization-dependent and by placing polarization-changing elements between the beam splitters and/or into the sampling arm and the reference loop. Thus the developed method and optical interferometer make possible to ensure highly efficient use of optical source power together with optimal signal-to-noise ratio for a given optical source power and are simple and cost effective.
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