Optical filter using a linear variable filter with...

Details Optical filter using a linear variable filter with... Optical filter using a linear variable filter with...

2005-06-21

2005-06-21

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Light interference

Electrically or mechanically variable

C359S589000

Reexamination Certificate

active

06909548

ABSTRACT:
This invention relates to a new optical geometry for using a linear variable filter as an optical spectral filter. An elliptical beam geometry with the minor beam axis oriented along the linearly varying axis of the filter is used. The beam is incident at a slight angle relative to the long axis of the beam. Ultimately this geometry produces a filter which has minimum spectral broadening from both angular and beam extent effects. Furthermore, this geometry results in low back reflectance and higher input beam power damage thresholds. The optical filter includes means for tuning a wavelength response of the filter. Further, the optical filter can afford Add/Drop functionality by providing optical circulators at the input and output ports.

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patent: 6590655 (2003-07-01), Welch et al.

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