Analysis of physical mechanism of beam crosstalk in semiconductor laser array spectral-beam-combined system

In spectral beam combining systems based on a grating-external cavity, due to some factors such as the “smile” effect of semiconductor laser array and error optical components in external from one emitter transmits into cavity then can return other emitters, thereby forming crosstalk between two emitters. this work, order investigate physical mechanism influence properties locked spectra efficiency, feedback rate equation, modes that stably oscillate coupling are derived, oscillating model is built. With consideration mode competition effects different emitters with intervals analyzed detail. The results show leads shift peak spectrum generation sub-peak. closer has more serious structure, combined spot, efficiency. efficiencies influencing 1<sup>st</sup>, 2<sup>nd</sup> 3<sup>rd</sup> 45.5%, 50.2%, 63.8%, respectively (When there no crosstalk, efficiency 80.1%). Finally, theoretical analysis verified experimentally, experimentally observed under phenomena degradation, shift, edge burrs, side lobes spectra, which consistent predictions. Moreover, according simulation experimental observations, it found be suppressed certain extent by increasing spacing Galileo telescope system suggested suppress optimize structure Compared Kepler does not have real focal point, prevent local power being too high, damaging components.