In optical fiber aspect , the incident beam can be collimated , converted and focused by some kinds of lenses , making the mode of incident beam matched with or near the optical fiber �� s modes . in this thesis , thorough theoretical analyses and experimental investigations were made for the external optical properties of a 980nm high - power tunnel junction regenerated multi - active - region quantum well stripe - geometry algaas / gaas / ingaas ld and three different stripe - width 980nm high - power
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