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Impact of near-end residual reflectivity on the spectral performance of high-power pump lasers

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8 Author(s)
Davis, M.K. ; Corning Lasertron, Bedford, MA, USA ; Kussmaul, A. ; Guowen Yang ; Hu, M.H.
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Abnormal spectral characteristics are observed in high-power semiconductor pump laser modules with ultralow chip front-facet reflectivity levels. We have identified the root cause as destructive interference in an external-cavity reflection from an antireflection (AR) coated fiber tip. This suppressive external cavity imposes a practical limit on the lower desirable bound for front-facet AR coatings for high-power lasers and uncooled fiber Bragg grating stabilized semiconductor devices.

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Quantum Electronics, IEEE Journal of  (Volume:40 ,  Issue: 4 )