title: Open- and closed-loop aberration correction by use of a quadrature interferometric wave-front sensor.
abstract: Experimental results are presented for an adaptive optics system based on a quadrature Twyman-Green interferometric wave-front sensor. The system uses a circularly polarized reference beam to form two interferograms with a pi/2 phase shift. The experiments conducted used Kolmogorov phase screens to simulate atmospheric phase distortions. Strehl ratio improvements by a factor of 8, to an absolute value of 0.45, are demonstrated.
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 74550-9234, USA. baker7@llnl.gov
authors.forename: Kevin L
authors.initials: KL
authors.lastname: Baker
authors.forename: Eddy A
authors.initials: EA
authors.lastname: Stappaerts
authors.forename: Scott C
authors.initials: SC
authors.lastname: Wilks
authors.forename: Peter E
authors.initials: PE
authors.lastname: Young
authors.forename: Donald T
authors.initials: DT
authors.lastname: Gavel
authors.forename: Jack W
authors.initials: JW
authors.lastname: Tucker
authors.forename: Dennis A
authors.initials: DA
authors.lastname: Silva
authors.forename: Scot S
authors.initials: SS
authors.lastname: Olivier