21 July 2010 Dual three-way infrared beam combiner at the CHARA Array
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Abstract
Two identical three-way beam combiners have been installed at the CHARA Array. The new setup is an extension of the two-beam pupil plain combiner, which has been in use thus far. Using the new beam combiners we can now obtain phase closure data in H, K or J band on two sets of three telescopes. A new optical design has been implemented to image the six outputs of the combiners onto six separate pixels in the infrared detector array. The new optical arrangement provides reduced background and spatial filtering. The magnitude limit of this beam combiner has reached 7.8 in K magnitude mainly as a result of better image quality by the new infrared camera optics.
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Judit Sturmann, Judit Sturmann, Theo ten Brummelaar, Theo ten Brummelaar, Laszlo Sturmann, Laszlo Sturmann, Harold A. McAlister, Harold A. McAlister, } "Dual three-way infrared beam combiner at the CHARA Array", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77343A (21 July 2010); doi: 10.1117/12.857517; https://doi.org/10.1117/12.857517
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