Proof of concept external ring cavity Quantum Cascade Laser

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We propose to construct a new type of Quantum Cascade Laser (QCL) device, based on anexternal ring cavity. External cavities have already been utilised to expand the availabletuning range of QCL devices. Indeed tuning from around 7 microns up to 11 microns has beendemonstrated from an external cavity QCL (ECQCL). In addition the use of ring cavities toproduce widely tuneable and highly stable single frequency laser light is well known (indeedM Squared produce a state-of-art Titanium:Sapphire laser product based on such a geometry).We propose here to leverage both of these approaches i.e. an external ring cavity, togetherwith M Squared’s proprietary technologies in relation to low noise drive electronics and stableoptical mounting, to produce a proof of concept ring ECQCL with state-of-the-art tuning rangeacross the full infrared waveband (MWIR and LWIR) combined with exemplary spectralpurity. A narrow linewidth ring QCL is an exciting platform technology which will bothenable and significantly improve applications in key areas such as environmentalsustainability, medicines and healthcare as well as defence and security. A product arisingfrom a successful project outcome would be an innovative system offering significantlyimproved performance and functionality and be designed with inherent reliability, thesefeatures will be combined with a intuitive user interface to provide end users with a powerfulnew technology to drive new high value applications.