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Feedback effects in tapered broad-area semiconductor lasers and amplifiers

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3 Author(s)
Bossert, D.J. ; Semicond. Laser Branch, Phillips Lab., Kirtland AFB, NM, USA ; Marciante, J.R. ; Wright, M.W.

A detailed experimental investigation of the effect of optical feedback upon the operation of high-power broad area InGaAs strained quantum well semiconductor lasers is presented. In particular, we examine the effect optical feedback has upon the beam quality of high-brightness lasers employing a tapered electrical contact. The far-field of such lasers is shown to degrade rapidly with power feedback ratios exceeding -30 dB, leading to a significantly reduced power in the central diffraction-limited far-field lobe. Far-field degradation is accompanied by dynamic instability and spectral broadening. Good beam quality and low intensity noise can be recovered, however, by rotating the feedback polarization.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:7 ,  Issue: 5 )