Abstract
In this letter, we investigate experimentally the influence of injection current-induced beam astigmatism change in a distributed Bragg reflector tapered diode laser on launching of its nearly diffraction limited, simple astigmatic laser beam into a single-mode fiber (SMF). In particular, the optical power and the laser beam properties in front and behind the SMF are examined in dependence on the current injected into the taper section of the diode laser. The fiber coupling measurements are conducted at two fixed configurations of the applied optical system, each of which is optimized for a different taper current value. A maximum power of 3.5 W ex SMF at a coupling efficiency of 67% is reached.
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