A novel adaptive wave-front correction system based on an all-optical feedback interferometer is described. In this system the two-dimensional output fringe intensity from a Mach–Zehnder interferometer with large radial shear is optically fed back to an optically addressed phase-only liquid-crystal spatial light modulator. Consequently, without a separate aberration-free reference wave, the modulator phase approximates the conjugate of the interferometer phase that is directly related to the phase of the input aberrated wave front, so this system is applicable in adaptive optics. We successfully achieved real-time correction of aberrated wave fronts: A diffraction pattern that was seriously distorted because of aberrations was transformed into a diffraction-limited spot immediately after the feedback loop was closed.
© 2000 Optical Society of America
[Optical Society of America ]
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(230.3720) Optical devices : Liquid-crystal devices
(230.6120) Optical devices : Spatial light modulators
T. Shirai, T. H. Barnes, and T. G. Haskell, "Adaptive wave-front correction by means of all-optical feedback interferometry," Opt. Lett. 25, 773-775 (2000)