3D optical waveguides in Ge22As20Se58 glass - a highly nonlinear material for the Mid-IR

Ultrafast Laser Inscription (ULI) of waveguides and Z-scan measurements have been performed in Ge22As20Se58 glass (GASIR-1). Light guiding at 2.45 μm and 2.9 μm is shown, demonstrating the potential of GASIR-1 for Mid-IR integrated optics

Nonlinear spectral broadening of femtosecond pulses in a Bragg fiber: experimental demonstration

Propagation of femtosecond pulses in a photonic band-gap silica core Bragg fiber is experimentally studied. Nonlinear spectral broadening is demonstrated in conformity with predictions made in a recent theoretical paper

Nonlinear spectral broadening of femtosecond pulses in a Bragg fiber: experimental demonstration

Propagation of femtosecond pulses in a photonic band-gap silica core Bragg fiber is experimentally studied. Nonlinear spectral broadening is demonstrated in conformity with predictions made in a recent theoretical paper

Mid-IR Supercontinuum Generation in Ultrafast Laser Inscribed Waveguides

Supercontinuum from 2.5 to 6.5 μm has been generated in ULI waveguides pumped with femtosecond pulses centered at 4.6 μm. Dispersion measurements show the zero dispersion wavelength for the waveguides to be around 5.3 μm

Ge22As20Se58 glass ultrafast laser inscribed waveguides for mid-IR integrated optics

Ultrafast laser inscription has been used to produce channel waveguides in Ge22As20Se58 glass (GASIR-1, Umicore N.V). The mode field diameter and waveguide losses at 2.94 μm were measured along with the waveguide dispersion in the 1 to 4.5 μm range, which is used to estimate the zero-dispersion wavelength. Z-scan measurements of bulk samples have also been performed to determine the nonlinear refractive index. Finally, mid-IR supercontinuum generation has been shown when pumping the waveguides with femtosecond pulses centered at 4.6 μm. Supercontinuum spanning approximately 4 μm from 2.5 to 6.5 μm was measured which, to the best of the authors’ knowledge, represents the broadest and the deepest IR supercontinuum from an ultrafast laser inscribed waveguide to date. This work, combined with the long wavelength transmission of GASIR-1 up to 15 μm, paves the way for realizing further ultrafast laser inscribed waveguide devices in GASIR-1 for mid-IR integrated optics applications

Nonlinear optical properties of multilayer graphene in the infrared

10.1364/OE.24.013033Optics Express241213033-1304

Advances in Doppler lidar for accurate 3D wind measurements

We present results from our recent development of a multi-beam Doppler lidar system for accurate 3-dimensional wind measurements. The eye-safe all-fibre system consists of a single seed laser that is amplified in multiple stages and shared between the three emitters. Steps towards wind turbine blade integration will be outlined