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Proceedings Paper

High-brightness emission from stripe-array broad area diode lasers operated in off-axis external cavities
Author(s): Andreas Jechow; Danilo Skoczowsky; Mark Lichtner; Mindaugas Radziunas; Ralf Menzel
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Paper Abstract

Phase-coupled stripe-array diode lasers show a strong double-lobed far-field because adjacent stripes tend to operate in the anti-phase supermode. One way to achieve a stable phase relationship and global coupling of the emitters of such a stripe-array is off-axis feedback. In this work several off-axis external cavity designs are discussed. A 400 μm wide emitter stripe array consisting of 40 stripes with a pitch of 10 μm was investigated. By operating this device in a Littrow type off-axis external cavity, more than 2 W of output power of near diffraction-limited, single longitudinal mode emission with a brightness as high as 88 MW/cm2-str could be achieved. The technique of off-axis feedback was also adapted to realize spectral beam combining of 25 emitters of a laser bar. The experimental data are compared with numerical simulations using a new theoretical model including feedback.

Paper Details

Date Published: 17 February 2010
PDF: 11 pages
Proc. SPIE 7583, High-Power Diode Laser Technology and Applications VIII, 758312 (17 February 2010); doi: 10.1117/12.843047
Show Author Affiliations
Andreas Jechow, Univ. of Potsdam (Germany)
Danilo Skoczowsky, Univ. of Potsdam (Germany)
Mark Lichtner, Weierstrass Institute for Applied Analysis and Stochastics (Germany)
Mindaugas Radziunas, Weierstrass Institute for Applied Analysis and Stochastics (Germany)
Ralf Menzel, Univ. of Potsdam (Germany)

Published in SPIE Proceedings Vol. 7583:
High-Power Diode Laser Technology and Applications VIII
Mark S. Zediker, Editor(s)

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