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High power, nearly diffraction-limited output from a semiconductor laser with an unstable resonator

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7 Author(s)
Tilton, Michael L. ; Rockwell Power Syst., Albuquerque, NM, USA ; Dente, Gregory C. ; Paxton, A.H. ; Cser, J.
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The authors describe an on-the-chip design of a nearly diffraction-limited broad-area semiconductor diode laser. The device achieved single lateral mode operation as unstable resonators with magnifications between two and three. The unstable resonators were realized by focused ion beam (FIB) micromachining a diverging mirror at one of the outcoupling facets. The modeling efforts agree well with experimental data and show that an optimum device design exists in which stable nearly diffraction-limited operation is predicted for up to six times threshold. This unstable resonator design has achieved, experimentally, the highest diffraction limited power and best external differential efficiency ever reported for any broad-area device with a curved facet

Published in:

Quantum Electronics, IEEE Journal of  (Volume:27 ,  Issue: 9 )

Date of Publication:

Sep 1991

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