Quantum cascade laser intensity noise under external feedback conditions estimated from self-mixing method
Electronics Letters（2013）
Abstract
Measured is the relative intensity noise (RIN) of a mid-infrared Peltier-cooled distributed-feedback (DFB) quantum cascade laser (QCL) with a feedback loop, where optical feedback parameters affecting the RIN were estimated by using the self-mixing method. To that end, a reflecting mirror forming the external cavity was placed on a voice coil and was moved back and forth after the RIN measurements, by which characteristic waveforms appeared. The amount of external feedback could thereby be deduced. There was no appreciable change in the RIN of the DFB-QCL, even with an optical feedback being in the coherence collapse regime in the case of conventional DFB-laser diodes.
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Key words
peltier effect,distributed feedback lasers,intensity measurement,laser cavity resonators,laser feedback,laser mirrors,laser variables measurement,light coherence,noise measurement,optical variables measurement,quantum cascade lasers,dfb qcl,rin measurements,characteristic waveforms,coherence collapse,conventional dfb-laser diodes,external cavity,external feedback conditions,feedback loop,midinfrared peltier-cooled distributed-feedback quantum cascade laser,optical feedback parameters,quantum cascade laser intensity noise,reflecting mirror,self-mixing method,voice coil
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