D. T. D. Childs

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Interest in mid-infrared spectroscopy instrumentation beyond classical FTIR using a thermal light source has increased dramatically in recent years. Synchrotron, supercontinuum, and external-cavity quantum cascade laser light sources are emerging as viable alternatives to the traditional thermal black-body emitter (Globar), especially for remote(More)
We report a broadband-gain superluminescent diode (SLD) based on self-assembled InAs quantum dots (QDs) for application in a high-resolution optical coherence tomography (OCT) light source. Four InAs QD layers, with sequentially shifted emission wavelengths achieved by varying the thickness of the In0.2Ga0.8As strain-reducing capping layers, were embedded(More)
We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned PCSEL elements. This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers. Mutual coherence of the PCSEL elements is verified through the demonstration of a(More)
A high-performance superluminescent light-emitting diode (SLD) based upon a hybrid quantum well (QW)/quantum dot (QD) active element is reported and is assessed with regard to the resolution obtainable in an optical coherence tomography system. We report on the appearance of strong emission from higher order optical transition from the QW in a hybrid QW/QD(More)
Optical coherence tomography (OCT) allows for the generation of 3D tomographic images of sub-surface structures in-vivo. This non-destructive, non-ionising process has found application in biological science and clinical diagnosis. Specifically, two versions of the OCT technique have proved optimal for different applications. For retinal imaging through a(More)
Innovation in integrated photonics and associated fields is imperative with looming bottlenecks in the existing internet infrastructure due to rapidly increasing demand, across society and industry, for greater bandwidth and data access. A priority in this field is the development of a monolithic photonic integrated circuit (PIC), simplifying the design,(More)
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