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Demonstration of a photonic lantern low order wavefront sensor using an adaptive optics testbed
Author(s): Mark K. Corrigan; Timothy J. Morris; Robert J. Harris; Theodoros Anagnos
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Paper Abstract

We demonstrate the use of an optimized 5 core photonic lantern (PL) to simultaneously measure tip/tilt errors at the telescope focal plane, while also providing the input to an instrument. By replacing a single mode (SM) fiber with the PL we show that it is possible to stabilize the input PSF to an instrument due to non-common path tip/tilt aberrations in an adaptive optics system. We show the PL in two different regimes, (i) using only the outer cores for tip/tilt measurements while feeding an instrument with the central core and, (ii) using all cores to measure tip/tilt when used in an instrument such as a spectrograph. In simulations our PL displays the ability to retrieve tip/tilt measurements in a linear range of ±55milliarcseconds. At the designed central wavelength of 1.55μm, configuration (i) matches the throughput of an on-axis SM fiber but declines as we move away from this wavelength. In configuration (ii) we make use of the whole multimode input of the PL resulting in a potential increase of overall throughput compared to a SM fiber, while eliminating modal noise.

Paper Details

Date Published: 17 July 2018
PDF: 8 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107035H (17 July 2018); doi: 10.1117/12.2311336
Show Author Affiliations
Mark K. Corrigan, Durham Univ. (United Kingdom)
Timothy J. Morris, Durham Univ. (United Kingdom)
Robert J. Harris, Landessternwarte Heidelberg (Germany)
Theodoros Anagnos, Landessternwarte Heidelberg (Germany)

Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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