Femtosecond laser inscription of depressed cladding single-mode mid-infrared waveguides in sapphire

Mid-infrared optical waveguides were inscribed in sapphire with femtosecond pulses at 515   nm. We show that such pulses induce a smooth negative refractive index change allowing for the inscription of a depressed cladding waveguide by closely overlapping the corresponding type I modification ...

Source: Optics Letters - December 14, 2018 Category: Physics Authors: Jean-Philippe B é rub é Jerome Lapointe Albert Dupont Martin Bernier R é al Vall é e Source Type: research