ISSN:
1572-9508
Keywords:
adaptive optics
;
modal aliasing
;
modal control
;
wavefront sensing
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The adaptive optics system ALFA differs in some aspects from systems like ADONIS and PUEO which have delivered scientific results since years. Interchangeable lenslet arrays with different numbers of subapertures and a deformable mirror with many more actuators than the number of corrected modesresult in some peculiarities in the calibration of the system and the reconstruction of incident wavefronts.We describe the design of ALFA's optics and its modal control architecture with a focus on a comparative study of the performance of different mode sets used to correct the wavefront aberrations. An outlook on our plans to improve and simplify the use of ALFA is given.The last section is dedicated to issues related to observing with ALFA in its present state. Expected Strehl ratios for different seeing conditions and guide star magnitudes are summarized in a table. AO observations in general, direct imaging and doing spectroscopywith ALFA in particular are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008165402336
Permalink
