Efficient mid-infrared dispersive wave generation in dispersion-engineered Si3N4 waveguides pumped at 2 μm

Abstract

We demonstrate efficient generation of mid-infrared dispersive wave at 3.5 m in a Si3N4 waveguide pumped by a 2090nm femtosecond mode-locked fiber laser. The 8% maximum efficiency allows for a milliwatt-level average power mid-infrared pulse.

Gas spectroscopy using low threshold mid-infrared radiation generated in Si3N4 waveguides

“…However limitations in terms of conversion efficiency (CE) beyond 3 μm implies input average power levels of hundreds of milliwatts to achieve the mW-level Mid-IR power range required for fast spectroscopic application [3]. We recently proved that CE can be improved by optimizing the pump wavelength while maintaining the desired phase-matching conditions [4]. However, such scheme has never been used for gas sensing experiments yet.…”

Ultrafast mid-infrared optics in gas-filled hollow core fiber

“…On the other hand, by applying the special dispersion engineered Si3N4, the on-chip nanophotonic waveguides can achieve tunable fs MIR phase-matching dispersive wave (DW) generation. Nevertheless, due to the limited power handling ability, the nanophotonic waveguide is unsuitable for high-power MIR pulses generation, which is normally achieved in sub-nanojoule level [21][22][23].…”