Patent ID: 9696212
Date: 2017-07-04
CPC Classifications: G01J

Claim:
1. An extended field heterodyne detection apparatus comprising: a local signal oscillator having an exit; an oscillated first beam transmitted from the exit of the local signal oscillator along an optical first path; a micro-lens array set in optical relation with the local signal oscillator multiplexing the oscillated first beam into a plurality of beamlets; a local oscillator injection lens in optical relation with the micro-lens array; a first stop in optical relation with the local oscillator injection lens, wherein the local oscillator injection lens is interposed optically between the micro-lens array and the first stop; a signal second beam transmitted from a target field of view along an optical second path, wherein the optical first and second paths intersect at the first stop; a semi-reflective beam splitter positioned at a similar location as the first stop where the optical first and second paths intersect and the beam splitter reflecting the oscillated first beam parallel to the signal second beam passing through the semi-reflective beam splitter; an objective lens set in optical relation with the beam splitter; a focal plane detector array positioned in optical relation with the first stop; an optical third path extending from the first stop to the focal plane array; and a combined beam formed from a combination of the oscillated first beam parallel to the signal second beam transmitting along the optical third path to the focal plane array, wherein the oscillated first beam and the signal second beam forming the combined beam are parallel at the focal plane detector array such that the oscillated first beam is mode-matched with the signal second beam.