BEAM SHAPER, OPTICAL SYSTEM AND METHODS USING THE SAME

摘要

An optical beam shaper comprises a polarization-dependent phase adjustment member which applies a phase pattern of equal magnitude and opposite sign to two orthogonal polarization states. The beam shaper can be used to introduce astigmatism to an light beam, but can also be used to undo the astigmatism to a beam with an orthogonal polarization state. The beam shaper is advantageously used within a detection device.