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Proceedings Paper

Feedback-induced catastrophic optical mirror damage (COMD) on 976nm broad area single emitters with different AR reflectivity
Author(s): Britta Leonhäuser; Heiko Kissel; Andreas Unger; Bernd Köhler; Jens Biesenbach
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Paper Abstract

We have carried out a comprehensive study on 976nm single emitters with different AR coatings (1%, 3%, 4%, and 5%), which have been exposed to optical feedback to investigate damages caused by back-reflected light and how to prevent them. By observing the near-field pattern while varying the probe current, we got information about the influence on filamentation and on peak-power densities with and without external optical feedback. For constant feedback strength, filamentation became more pronounced and more dynamic with increasing current. We observed bistable and chaotic “jumping” of high-intensity filaments. For usual operation currents and external feedback strengths of ≥4%, single emitters with low AR coating show COMDs; their positions correlate with excessive peaking in the near-field pattern. Finally we found that an increasing AR reflectivity depletes the influence of feedback light on the near-field pattern as well as on the emission spectra and lowers the risk of COMD.

Paper Details

Date Published: 7 March 2014
PDF: 10 pages
Proc. SPIE 8965, High-Power Diode Laser Technology and Applications XII, 896506 (7 March 2014); doi: 10.1117/12.2039153
Show Author Affiliations
Britta Leonhäuser, DILAS Diodenlaser GmbH (Germany)
Heiko Kissel, DILAS Diodenlaser GmbH (Germany)
Andreas Unger, DILAS Diodenlaser GmbH (Germany)
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)


Published in SPIE Proceedings Vol. 8965:
High-Power Diode Laser Technology and Applications XII
Mark S. Zediker, Editor(s)

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