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We report the ultrafast laser fabrication and mid-IR characterization (3.39microns) of four-port evanescent field directional couplers. The couplers werefabricated in a commercial gallium lanthanum sulphide glass substrate usingsub-picosecond laser pulses of 1030 nm light. Straight waveguides inscribedusing optimal fabrication parameters were found to exhibit propagation lossesof 0.8 dB/cm. A series of couplers were inscribed with different interactionlengths, and we demonstrate power splitting ratios of between 8% and 99% formid-IR light with a wavelength of 3.39 microns. These results clearlydemonstrate that ultrafast laser inscription can be used to fabricate highquality evanescent field couplers for future applications in astronomicalinterferometry.

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