26 July 2016 ALOHA/CHARA at 1.55 μm: sensitivity improvement and on-sky ability to detect astronomical sources in H band
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Abstract
The interferometric concept named ALOHA (Astronomical Light Optical Hybrid Analysis) offers an alternative for high resolution imaging in the mid-infrared domain by shifting the astronomical light to shorter wavelength where optical guided components from telecommunications are available and efficient. A prototype with two arms converting a signal from 1.55 μm to 630 nm is used to validate the concept in laboratory and on-sky. Thanks to collaboration with the CHARA team, photometric tests were achieved with a single arm of the interferometer and have allowed to predict instrument performance in its interferometric configuration in order to obtain first fringes in H band.
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P. Darré, L. Grossard, L. Delage, F. Reynaud, N. J. Scott, J. Sturmann, T. A. Ten Brummelaar, "ALOHA/CHARA at 1.55 μm: sensitivity improvement and on-sky ability to detect astronomical sources in H band", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990724 (26 July 2016); doi: 10.1117/12.2232315; https://doi.org/10.1117/12.2232315
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