Nanoscale Displacement Sensing Based on Nonlinear Frequency Mixing in Quantum Cascade Lasers


We demonstrate a sensor scheme for nanoscale target displacement that relies on a single quantum cascade laser (QCL) subject to optical feedback. The system combines the inherent sensitivity of QCLs to optical reinjection and their ultrastability in the strong feedback regime where nonlinear frequency mixing phenomena are enhanced. An experimental proof of… (More)


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