Share Email Print
cover

Proceedings Paper

Adaptive optics package designed for astronomical use with a laser guide star tuned to an absorption line of atomic sodium
Author(s): J. Thaddeus Salmon; Kenneth Avicola; James M. Brase; John W. Bergum; Herbert W. Friedman; Donald T. Gavel; Claire E. Max; Stephen D. Mostek; Scot S. Olivier; Robert W. Presta; Rodney J. Rinnert; Charles D. Swift; Kenneth E. Waltjen; Carolyn L. Weinzapfel; Jen Nan Wong
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

We present the design and implementation of a very compact adaptive optics system that senses the return light from a sodium guide-star and controls a deformable mirror and a pointing mirror to compensate atmospheric perturbations in the wavefront. The deformable mirror has 19 electrostrictive actuators and triangular subapertures. The wavefront sensor is a Hartmann sensor with lenslets on triangular centers. The high-bandwidth steering mirror assembly incorporates an analog controller that samples the tilt with an avalanche photodiode quad cell. An f/25 imaging leg focuses the light into a science camera that can either obtain long-exposure images or speckle data. In laboratory tests overall Strehl ratios were improved by a factor of 3 when a mylar sheet was used as an aberrator. The crossover frequency at unity gain is 30 Hz.

Paper Details

Date Published: 31 May 1994
PDF: 9 pages
Proc. SPIE 2201, Adaptive Optics in Astronomy, (31 May 1994); doi: 10.1117/12.176053
Show Author Affiliations
J. Thaddeus Salmon, Lawrence Livermore National Lab. (United States)
Kenneth Avicola, Lawrence Livermore National Lab. (United States)
James M. Brase, Lawrence Livermore National Lab. (United States)
John W. Bergum, Lawrence Livermore National Lab. (United States)
Herbert W. Friedman, Lawrence Livermore National Lab. (United States)
Donald T. Gavel, Lawrence Livermore National Lab. (United States)
Claire E. Max, Lawrence Livermore National Lab. (United States)
Stephen D. Mostek, Lawrence Livermore National Lab. (United States)
Scot S. Olivier, Lawrence Livermore National Lab. (United States)
Robert W. Presta, Lawrence Livermore National Lab. (United States)
Rodney J. Rinnert, Lawrence Livermore National Lab. (United States)
Charles D. Swift, Lawrence Livermore National Lab. (United States)
Kenneth E. Waltjen, Lawrence Livermore National Lab. (United States)
Carolyn L. Weinzapfel, Lawrence Livermore National Lab. (United States)
Jen Nan Wong, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 2201:
Adaptive Optics in Astronomy
Mark A. Ealey; Fritz Merkle, Editor(s)

© SPIE. Terms of Use
Back to Top