1. Novel waveguide increases superluminescent output

    Novel waveguide increases superluminescent output

    A partnershipbetween Polish and Japanese researchers claims to have set a new benchmark for the combination of output power and smoothness of spectral output for GaN superluminescent diodes. This team’s emitter features a ‘J-shaped’ waveguide and could be used in fibre-optic gyroscopes and optical coherence tomography. Both applications require a light source that combines a high degree of spatial coherence with low time coherence. These conditions are met with the superluminescent diodes. They were developed in the arsenide material system in the 1970s, but the shorter wavelengths emitted by GaN-based materials are beneficial.

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