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13 December 2020 K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription
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We report the ultrafast laser inscription (ULI) and characterization of 3 dB directional achromatic couplers for K-band between 2 and 2.4 μm. The couplers were fabricated in commercial Infrasil glass using 1030 nm femtosecond laser pulses. Straight waveguides inscribed using optimal fabrication parameters exhibit an average propagation loss of ∼1.21 dB over full range of K-band with a single-mode behavior for a length of 17 mm. Directional couplers with different interaction lengths and waveguide widths were fabricated and characterized. We demonstrate that 3 dB achromatic directional couplers for K-band can be fabricated using ULI. These results show that ULI can fabricate highquality couplers for future applications in astronomical interferometry. Our eventual aim is to develop a two-telescope K-band integrated optical beam combiner to replace JouFLU at CHARA.
Conference Presentation
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fraser A. Pike, Tarun K. Sharma, Aurélien Benoît, David G. MacLachlan, Aline N. Dinkelaker, Abani S. Nayak, Kalaga Madhav, Martin M. Roth, Lucas Labadie, Ettore Pedretti, Theo A. ten Brummelaar, Nicholas J. Scott, Vincent Coudé du Foresto, and Robert R. Thomson "K-band integrated optics beam combiners for CHARA fabricated by ultrafast laser inscription", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114460K (13 December 2020);

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