We have previously reported robust zinc-indiffused MgO:PPLN ridge waveguides for field applications in quantum-enhanced gravimetry and navigation, generating 2.5W of 780nm light at 74% second-harmonic generation (SHG) conversion efficiency. To tailor this process for different wavelengths and interactions, the effect of fabrication parameters on the waveguide mode shape and size from UV to MIR has been studied, with the aim to optimise mode matching between pump, SHG, and optical fibres to improve conversion efficiency, and reduce insertion loss in packaged devices.
We present the results of an extended study on the evolution of dicing blade dynamics to define the tolerances of the ductile regime for dicing optical quality facets with sub-nm surface roughness in optical materials. These results provide a route to determine the critical parameters, such as depth of cut, blade shape, and feed rate, to maintain stable ductile machining within a specific range of conditions. We will discuss our latest results and observations, including optical characterisation of waveguides in lithium niobate and other materials.
We demonstrate Ultra-Violet (UV) light generation using a diode-pumped Alexandrite laser and its Second Harmonic Generation (SHG) via Zn-indiffused MgO:PPLN waveguides. A wavelength range of 375-393 nm is obtained using third order SHG in Λ = 6.1−6.9 μm poled waveguides. Up to 1.3 mW UV power is obtained from 185 mW throughput infrared power. We believe that the wavelength and transverse mode flexibility from these waveguides gives rise to a wide range of applications for an efficient and compact laser module in the UVA range.
We report the demonstration of an integrated silicon-rich silicon nitride wavelength converter based on the Bragg scattering intermodal four-wave mixing process. This broadband wavelength converter incorporates on-chip mode conversion, multiplexing and de-multiplexing functionalities. The system allows for broadband signal conversion with a 3dB bandwidth exceeding 70 nm.
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