Optical system including focus-defocus focal plane array compensation technique using liquid crystal phased array

摘要

An optical system is described including an array of photodetectors, each photodetector having a surface, and a focusing system employing a liquid crystal phased array for focusing a beam of electromagnetic energy on the surface of at least one of the photodetectors. The focusing system further includes a focus-defocus technique for periodically defocusing the beam of electromagnetic energy on the surface of at least one of the photodetectors. With such an arrangement, a focusing system is provided wherein fixed pattern noise can be decreased.