Semiconductor laser Michelson interferometer under full optical feedback
We compare the experimental performance of the optical feedback semiconductor laser Michelson interferometer (OSMI) under full feedback (FF) with the predictions of a newly formulated FF-OSMI model. The nonlinear dependence of the laser output power (L) with the injection current (I) is investigated under various feedback strengths to determine the behavior the threshold current (Ith) and the slope of the L(I) curve. From the L(I) curves, we derive the effective value of the SL output facet diameter that is then utilized to compute for the FF-OSMI axial response that was confirmed to be 52% sharper than that of the OSMI axial response. The experimental results were in good agreement with the theoretical predictions. The FF-OSMI offers a wider OF tunability range and selection of possible Ith values.