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Laser guide star AO project at the Subaru Telescope
- Source :
- Advancements in Adaptive Optics.
- Publication Year :
- 2004
- Publisher :
- SPIE, 2004.
-
Abstract
- The laser guide star adaptive optics (AO) system for Subaru Telescope is presented. The system will be installed at the IR Nasmyth platform, whereas the current AO system with 36 elements is operating at the Cassegrain focus. The new AO system has a 188 element wavefront curvature sensor with photon counting APD modules which is the largest control element curvature sensor system ever. The system will have 4-10 W solid state sum-frequency laser to generate a laser guide star. The laser launching telescope with 50 cm aperture will be installed at behind the secondary mirror. The laser unit will be installed on the third floor of the dome and the laser beam will be transferred to the laser launching telescope using single mode photonic crystal fiber cable. The field of view of the optics is 2.7 arcmin to maximize the probability to find tilt guide stars for laser guide star operation. The expected Strehl ratio as raw AO performance is 0.46 at H-band under 0.60" seeing with 12 th mag guide star, and 0.71 for 8 th mag stars. New wavefront modulation technique, dual stroke membrane mirror control, is developed to reduce the tilt error which is more dominant for curvature sensor AO system. The superb contrast imaging capability will be expected as natural guide star system. The first light as the natural guide star system is planned in March 2006, the laser first light will be expected in March 2007.
- Subjects :
- Physics
business.industry
Astrophysics::Instrumentation and Methods for Astrophysics
Physics::Optics
Astronomy
Cassegrain reflector
Astrophysics::Cosmology and Extragalactic Astrophysics
First light
law.invention
Telescope
Laser guide star
Optics
law
Astrophysics::Earth and Planetary Astrophysics
Guide star
Secondary mirror
Subaru Telescope
business
Adaptive optics
Astrophysics::Galaxy Astrophysics
Subjects
Details
- ISSN :
- 0277786X
- Database :
- OpenAIRE
- Journal :
- Advancements in Adaptive Optics
- Accession number :
- edsair.doi...........cf18ab0172823cb919058e1c75fbd645