| Autor: |
Ettore Pedretti, T. ten Brummelaar, David Guillaume MacLachlan, Robert R. Thomson, Vincent Coudé du Foresto, Kalaga Madhav, Martin Roth, Aurélien Benoit, Tarun Kumar Sharma, Lucas Labadie, Aline N. Dinkelaker, Fraser A. Pike, Abani Shankar Nayak, Nicholas Scott |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Optical and Infrared Interferometry and Imaging VII. |
| DOI: |
10.1117/12.2561663 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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