Abstract: In one aspect, an active hyperspectral filter array includes a polished wafer comprising a d33 material, wherein the d33 piezoelectric material is configured to display a piezoelectric effect along a same axis of a directed light used to obtain a controlled modulation; wherein the polished wafer comprises: a front electrode on a front surface of the polished wafer, a back electrode on a back surface of the polished wafer, wherein the front electrode and the back electrode are configured such that an optical path length is variable by application of an appropriate electric field.

Abstract: An ultracompact, lightweight, reflective telescope is described which has no loss due to central obscuration for a beam being projected from its focus. The optical surfaces are composed of matched conics of rotation.

Abstract: An ultracompact, lightweight, reflective telescope is described which has no loss due to central obscuration for a beam being projected from its focus. The optical surfaces are composed of matched conics of rotation.

Abstract: An ultracompact, lightweight, reflective telescope is described which has no loss due to central obscuration for a beam being projected from its focus. The optical surfaces are composed of matched conics of rotation.

Abstract: An imaging system and method for dual polarization imaging is provided. In one implementation, an imaging system includes a field stop located at a first image plane for limiting an incident light ray bundle passing through an aperture thereof and a polarization discriminating element adapted to separate the incident light ray bundle into a first ray bundle having a first polarization traveling in a first direction and a second ray bundle having a second polarization traveling in a second direction. The system also includes an image detector located at a second image plane to receive the first and second ray bundles such that the first ray bundle forms a first image at a first region of the image detector and the second ray bundle forming a second image at a second region the image detector, the first and second images laterally displaced from each other at the second image plane.