Mid-Infrared guiding and nonlinear spectral broadening in ultrafast laser inscribed gallium lanthanum sulphide waveguides

摘要

Spectral broadening spanning 850 nm (−15 dB points) was observed in an ultrafast laser inscribed gallium lanthanum sulphide waveguide under excitation of femto-second laser radiation with a central wavelength of 2.35 µm.