Physics – Optics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3353..910s&link_type=abstract
Proc. SPIE Vol. 3353, p. 910-916, Adaptive Optical System Technologies, Domenico Bonaccini; Robert K. Tyson; Eds.
Physics
Optics
Scientific paper
We present a rapid technique for the simultaneous calibration and flattening of a deformable mirror in an adaptive optics system. We achieve an rms surface figure equivalent to better than (lambda) /100 in the K band in our first application of the scheme. The technique requires the presented of a phase shifting interferometer within the adaptive optics system. Measurements of the mirror surface are made while each mirror actuator's gain is estimated, in a stable, system. Measurements of the mirror surface are made while each mirror actuator's gain is estimated, in a stable, iterative, convergent sequence. Knowledge of the mirror responses function to single actuator activation is not needed. The iterative process ends when the mirror surface reaches some preset desired flatness, which can be specified by the rms deviation of the surface. An overall scale correction to the gains is measured and applied after the iterations converge. Our technique uses the mirror under conditions similar to those present when the adaptive optics system is running. This technique provides the user the ability to calibrate the mirror in a matter of a minute or two, enabling re-calibration of the actuator gains may times during a night with minimal impact on observing duty cycle, in order to adapt to changing conditions.
Oppenheimer Ben R.
Sivaramakrishnan Anand
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