Single mode fiber coupling tip tilt control for a small amateur telescope

Massinissa Hadjara; Kevin Espinoza; Ricardo Jara; Benjamin Cornejo; Joaquin Rojas; Carolina Garcia; Miguel Pina; Alfredo Rates; Nicolas Ramos; Felipe E. Besser; Pablo Zorzi; Ernest A. Michael

doi:10.1117/12.2562771

13 December 2020 Single mode fiber coupling tip tilt control for a small amateur telescope

Massinissa Hadjara, Kevin Espinoza, Ricardo Jara, Benjamin Cornejo, Joaquin Rojas, Carolina Garcia, Miguel Pina, Alfredo Rates, Nicolas Ramos, Felipe E. Besser, Pablo Zorzi, Ernest A. Michael

Author Affiliations +

Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114462U (2020) https://doi.org/10.1117/12.2562771
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The current work presents a fiber coupling tip-tilt controller developed for a three-telescope experimental prototype of an Astronomical Fiber-Based Near-Infrared Heterodyne Interferometer. It is based on a commercial magneto-mechanical compact-disk laser-beam actuator on which the fiber-ferrule is mounted. The actuator is driven by a two-axis controller electronics board which was developed by us based on digital processing in a dsPIC33EP device with analog periphery, which reads the quad-photodiode signals amplified by 109, and drives the actuator with two high-current outputs. While this realizes the very fine and relatively fast (up to 100 Hz) fiber-position control in the telescope focus, as a basis to this, a relatively coarse and slow auto-guiding is given by an amateur guiding camera. During first optical bench testing we obtained an average coupled power increase of up to 50% under certain perturbations.

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Massinissa Hadjara, Kevin Espinoza, Ricardo Jara, Benjamin Cornejo, Joaquin Rojas, Carolina Garcia, Miguel Pina, Alfredo Rates, Nicolas Ramos, Felipe E. Besser, Pablo Zorzi, and Ernest A. Michael "Single mode fiber coupling tip tilt control for a small amateur telescope", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114462U (13 December 2020); https://doi.org/10.1117/12.2562771

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