Multi-Wavelength, High Spatial Brightness Operation
of a Phase-Locked Stripe-Array Diode Laser¹

A. Heuer*, A. Sagahti, A. Jechow, D. Skoczowsky, and R. Menzel

University of Potsdam, Institute of Physics and Astronomy, Photonics,
Karl-Liebknecht Straße 24-25, D-14476 Potsdam, Germany

*e-mail: heuer@uni-potsdam.de

Received August 8, 2011; in final form, August 16, 2011; published online November 28, 2011

Abstract—Stable continuous wave multi-wavelength operation of a stripe-array diode laser with an external-
cavity spectral beam combining geometry is presented. In this setup each emitter of the stripe-array is forced
to operate at a different wavelength, which leads to a decoupling between the usually phase-locked emitters.
With a reflective diffraction grating with a period of 300 lines per mm, 33 equidistant laser lines around a center
wavelength of 978 nm were realized, spanning a spectral range of 26 nm. With this novel approach near-dif-
fraction limited emission with a beam quality of M² < 1.2 and an output power of 450 mW was achieved. This
laser light source can be used for applications requiring low temporal but high spatial coherence.

DOI: 10.1134/S1054660X12010057

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