COHERENT LIGHT SOURCE AND OPTICAL DEVICE

摘要

High power output can be easily obtained from a wide stripe laser, however, since its transverse mode is a multimode and an efficiency of coupling with a single mode waveguide and a single mode fiber is low, there have been problems in application to high-coherence devices. An oscillation mode of a semiconductor laser can be fixed to a single mode by feeding back beams projected from the wide stripe semiconductor laser to an active layer of the semiconductor laser, after having the beams permeate a mode transducer and a wavelength selecting filter.