Abstract
When equipped with adaptive optics, the coming generation of large 6–10-m telescopes can combine huge light grasp with very sharp images. We describe a specific design concept for recovery of diffraction-limited images in the 1.6- and the 2.2-μm atmospheric windows, yielding 0.05-arcsec resolution for an 8-m telescope. Our goal has been to achieve this performance routinely by not requiring above-average atmospheric conditions or the use of unusually bright nearby stars. Atmospheric blurring is sensed with a sodium laser beacon of a few watts. Image motion is sensed by starlight, with a quadrant detector that is sensitive to the broad infrared band in which photon flux is typically largest and the field star has been sharpened by laser-beacon correction that is shared with the science target. A detailed performance analysis shows that for typical conditions Strehl ratios of >25% are expected at 2.2 μm, with the probability of finding a sufficiently bright field star exceeding 50%.
© 1994 Optical Society of America
Full Article | PDF ArticleMore Like This
M. Lloyd-Hart, R. Dekany, D. Sandler, D. Wittman, R. Angel, and D. McCarthy
J. Opt. Soc. Am. A 11(2) 846-857 (1994)
D. T. Gavel, J. R. Morris, and R. G. Vernon
J. Opt. Soc. Am. A 11(2) 914-924 (1994)
Scot S. Olivier and Donald T. Gavel
J. Opt. Soc. Am. A 11(1) 368-378 (1994)