Abstract

We present a dense wavelength division multiplexer based on volume Bragg gratings (VBGs) with a channel spacing of $\mathrm{\Delta }\lambda =1.5\mathrm{nm}$. Multiplexing efficiencies of ${\eta }_{\mathrm{SM}}=97\%$ 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 $\delta {\lambda }_{95\%}=120\mathrm{pm}$. When the multimode high-power diode laser radiation with a beam propagation factor of ${\mathrm{M}}^2\approx 45$ is overlaid, the multiplexing efficiency decreases to ${\eta }_{\mathrm{MM}}=85\%$. Temperature control of the VBGs expands the high-efficiency operation range.

© 2013 Optical Society of America

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