Birefringent interferometer
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United States of America Patent
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Jul 16, 2002
Grant Date -
N/A
app pub date -
Jun 30, 2000
filing date -
Jul 2, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A birefringent interferometer system is described which uses nematic liquid crystal cells to produce variable optical path differences (OPD) between light of different polarization states that are interfered at a polarizing analyzer. Fixed retarders may also be incorporated to extend the range of OPD. The interferometer provides wide field-of-view, continuously variable path difference over a large range, and an on-board monitor of OPD for ensuring accurate settings of path difference, and hence, an accurate wavelength scale in the spectra produced by the apparatus. The system can further incorporate additional polarizing optics so it responds equally well to light of any incident polarization state without loss of efficiency.
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