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Proceedings Paper

Phase-locked array of 25 broad-area lasers
Author(s): Volker Raab; Ralf Menzel
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Paper Abstract

We will report experimental results on the coherent laser operation of a bar of broad area lasers. The array is 1 cm wide and consists of 25 lasers of 200 micrometer width each. Under normal conditions the lasers possess no mutual coupling and, therefore, emit incoherently. The resulting beam quality is correspondingly very low and typically more than 2000-fold diffraction-limited. To coherently couple the emitters we operate them in an external cavity. Inside the cavity a multiplexing and mutual coupling is achieved by means of a 16 level diffractive optic (DO) designed as a 1:25 beam splitter. We show that a stable phase-locked laser mode can build up inside the resonator. Its pronounced central angular emission lobe possesses a beam quality of approximately 60 times diffraction limit. In a passive setup, in which the internal dynamics of the broad area lasers can be suppressed by use of a seeding laser of good beam quality (M2<2), the central emission lobe is better than five times diffraction-limited.

Paper Details

Date Published: 6 June 2002
PDF: 7 pages
Proc. SPIE 4629, Laser Resonators and Beam Control V, (6 June 2002); doi: 10.1117/12.469500
Show Author Affiliations
Volker Raab, Univ. Potsdam (Germany)
Ralf Menzel, Univ. Potsdam (Germany)


Published in SPIE Proceedings Vol. 4629:
Laser Resonators and Beam Control V
Alexis V. Kudryashov, Editor(s)

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