An adaptive optics package designed for astronomical use with a laser guide star tuned to an absorption line of atomic sodium
- and others
We present the design and implementation of a very compact adaptive optic 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 {line_integral}/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.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10154711
- Report Number(s):
- UCRL-JC-114939; CONF-940391-7; ON: DE94012391
- Resource Relation:
- Conference: Society of Photo-Optical Instrumentation Engineers (SPIE) conference,Kona Beach, HI (United States),13-18 Mar 1994; Other Information: PBD: 11 Apr 1994
- Country of Publication:
- United States
- Language:
- English
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