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Multi-Wavelength Operation of a Single Broad Area Diode Laser by Spectral Beam Combining

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5 Author(s)
Zink, C. ; Photonics Dept., Univ. of Potsdam, Potsdam, Germany ; Werner, N. ; Jechow, A. ; Heuer, A.
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Stabilized multi-wavelength emission from a single emitter broad area diode laser (BAL) is realized by utilizing an external cavity with a spectral beam combining architecture. Self-organized emitters that are equidistantly spaced across the slow axis are enforced by the spatially distributed wavelength selectivity of the external cavity. This resulted in an array like near-field emission although the BAL is physically a single emitter without any epitaxial sub-structuring and only one electrical contact. Each of the self-organized emitters is operated at a different wavelength and the emission is multiplexed into one spatial mode with near-diffraction limited beam quality. With this setup, multi-line emission of 31 individual spectral lines centered around and a total spectral width of 3.6 nm is realized with a 1000 μm wide BAL just above threshold. To the best of our knowledge, this is the first demonstration of such a self-organization of emitters by optical feedback utilizing a spectral beam combining architecture.

Published in:

Photonics Technology Letters, IEEE  (Volume:26 ,  Issue: 3 )