Compact 35mm fiber coupled diode laser module based on dense wavelength division multiplexing of NBA mini bars
We present a compact, modular and cross talk free approach for dense wavelength division multiplexing of high power diode lasers based on ultra steep dielectric filters. The mini bars consist of 5 narrow stripe broad area emitters with a beam parameter product in the range of 2 mm mrad and a wavelength spacing of 2.5 nm between 2 adjacent emitters. Experimental results for fiber coupling (35 mm core diameter, NA 0.2) of internally and externally stabilized diode lasers are presented. Optical losses are analyzed and alternative optical designs to overcome the current limitations of the setup are discussed.
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