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High-power dense wavelength division multiplexing of multimode diode laser radiation based on volume Bragg gratings

: Hengesbach, S.; Krauch, N.; Holly, C.; Traub, M.; Witte, U.; Hoffmann, D.


Optics Letters 38 (2013), Nr.16, S.3154-3157
ISSN: 0146-9592
Bundesministerium für Bildung und Forschung BMBF
Fraunhofer ILT ()

We present a dense wavelength division multiplexer based on volume Bragg gratings (VBGs) with a channel spacing of Delta lambda = 1.5 nm. Multiplexing efficiencies of eta(SM) = 97% have been demonstrated with single-mode, frequency-stabilized diode laser radiation. By use of VBGs in an external-cavity laser we constrict the spectral bandwidth of passively cooled multimode diode laser bars with 19 broad-area emitters to delta lambda(95%) = 120 pm. When the multimode high-power diode laser radiation with a beam propagation factor of M-2 approximate to 45 is overlaid, the multiplexing efficiency decreases to eta(MM) = 85%. Temperature control of the VBGs expands the high-efficiency operation range.