Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2008-04-22
2008-04-22
Mack, Ricky (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S490020, C359S490020
Reexamination Certificate
active
11112654
ABSTRACT:
A hyper-spectral imaging filter has serial stages along an optical signal path with angularly distributed birefringent retarders and polarizers forming interference filters. The retarders can include tunable birefringent elements such as liquid crystals controlled in unison, fixed retarders and/or combined tunable and fixed birefringences. Distinctly different periodic transmission spectra are provided by different filter stages, each having multiple retarders, in particular with some stages having broad bandpass peaks at wide spectral spacing and other stages have very narrow closely spaced peaks. The respective spectra include at least one tunably selectable band at which the transmission spectra of the filter stages coincide, whereby the salutary narrow bandpass and wide spectral spacing ranges of different stages apply together, resulting in a high finesse wavelength filter suitable for spectral imaging.
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Wang Chenhui
Wang Xinghua
ChemImage Corporation
Duane Morris LLP
Mack Ricky
Tra Tuyen
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