Abstract

A collimator with a long focal length and large aperture is a very important apparatus for testing large-aperture optical systems. But it suffers from internal air turbulence, which may limit its performance and reduce the testing accuracy. To overcome this problem, an adaptive optics system is introduced to compensate for the turbulence. This system includes a liquid crystal on silicon device as a wavefront corrector and a Shack–Hartmann wavefront sensor. After correction, we can get a plane wavefront with rms of about $0.017\lambda$ ($\lambda =0.6328\mathrm{\mu m}$) emitted out of a larger than $500\mathrm{mm}$ diameter aperture. The whole system reaches diffraction-limited resolution.

© 2008 Optical Society of America

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