US 12,078,817 B2
Geometric phase based motion compensation for shearography
Jacob D. Garan, Boulder, CO (US); and Michael J. DeWeert, Kaneohe, HI (US)
Assigned to BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed by BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
Filed on Dec. 29, 2021, as Appl. No. 17/565,124.
Prior Publication US 2023/0204970 A1, Jun. 29, 2023
Int. Cl. G02B 27/48 (2006.01); G01B 11/16 (2006.01); G02B 27/28 (2006.01)
CPC G02B 27/48 (2013.01) [G01B 11/162 (2013.01); G02B 27/283 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A laser transmission assembly comprising:
a polarizing beam splitter operable to direct a first laser beam pulse and a subsequent second laser beam pulse through a series of optical components within the transmission assembly; and
at least one pair of geometric phase (GP) plates;
wherein the at least one pair of GP plates are operable to steer the first laser beam pulse away from a midline axis of the transmission assembly in a first direction and to steer the second laser beam pulse away from the midline axis of the transmission assembly in a second direction such that the first and second laser beam pulses appear to originate from a single point; and
wherein the at least one pair of GP plates further comprises:
a first pair of GP plates operable to steer the first laser beam pulse away from the midline axis of the transmission assembly in the first direction; and
a second pair of GP plates operable to steer the second laser beam pulse away from the midline axis of the transmission assembly in the second direction.