First tests for a low cost curvature oriented AO

Details First tests for a low cost curvature oriented AO First tests for a low cost curvature oriented AO

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..197h&link_type=abstract

SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,

Physics

Optics

Scientific paper

WSince a few years we are developing a low cost adaptive optics device for the GI2T optical interferometer. Our AO is based on a curvature sensor and a 31 actuators bimorphe mirror. Our design of the wave front sensor use an array of prisms that split the intra-extra focal plane and focus them directly on avalanche photo diodes (APD). This configuration reduce the cost and allow an easy and fast alignment. We present here the design and the results obtained on a test bench for the whole loop. Our home made APD follow the 2.5 kHz modulation of the intra-extra focal plane and their alignment through a pierced copper block is well stable. The calculator follow the wave variations with a cut-off frequency of 250 Hz. We are know considering the integration of this AO on the recombination table of the GI2T interferometer.

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