Thin-film filter, wavelength-locked, multi-laser cavity for dense wavelength beam combining of broad-area laser diode bars

We report on individual wavelength locking of a multiplet of 100-μm broad-area laser diode emitters arranged on a 50% fill-factor bar by means of a single external multi-laser cavity using an ultra-narrowband thin-film filter as a dispersive optical element. The achieved wavelength-locked output pow...

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Bibliographic Details
Published in:Optics letters 2015-09, Vol.40 (17), p.3949-3952
Main Authors: Haas, M, Killi, A, Tillkorn, C, Ried, S, Ginter, M, Zimer, H
Format: Article
Language:English
Subjects:
Beams (radiation)
Emitters
Holes
Laser beams
Laser diodes
Thin films
Wave filters
Wavelengths
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Summary:We report on individual wavelength locking of a multiplet of 100-μm broad-area laser diode emitters arranged on a 50% fill-factor bar by means of a single external multi-laser cavity using an ultra-narrowband thin-film filter as a dispersive optical element. The achieved wavelength-locked output power is 216 W, corresponding to an electrical-to-optical conversion efficiency of about 49.7%. The 45 emitters of the laser diode bar are stabilized within a spectral range of about 6.4 nm. Our approach is suited for killowatt-class dense wavelength beam combining of direct diode lasers.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.40.003949