Ultrafast laser inscription of mid-IR directional couplers for stellar interferometry.


We report the ultrafast laser fabrication and mid-IR characterization (3.39 μm) of four-port evanescent field directional couplers. The couplers were fabricated in a commercial gallium lanthanum sulfide glass substrate using sub-picosecond laser pulses of 1030 nm light. Straight waveguides inscribed using optimal fabrication parameters were found to exhibit… (More)
DOI: 10.1364/OL.39.004820


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