In this work, coupling of radiation generated by a distributed Bragg reflector (DBR) tapered diode laser around 1064 nm
into a single-mode-fiber (SMF) within a butterfly module with a footprint < 10 cm2 is demonstrated. The module
comprises temperature stabilizing components, a brightness maintaining micro optical assembly mounted with submicrometer
precision and a standard FC/APC output connector. The aim of the introduced concept is to improve the
beam quality and to eliminate the current dependent beam astigmatism, characteristic for tapered diode lasers and
amplifiers, and, thus, provide an efficient, multi-Watt laser light source characterized by a narrow-band spectrum and a
stigmatic, nearly Gaussian laser beam independent of the operating point. A maximum power ex SMF of 2.5 W at a
coupling efficiency of 57 % is reached in the presented butterfly module.
In this work, we investigate experimentally coupling of diode laser radiation into a single-mode-fiber (SMF) at high optical power. In particular, nearly diffraction-limited, single-frequency continuous wave (CW) radiation around 1064 nm generated by a distributed Bragg reflector (DBR) tapered diode laser is coupled in a bench-top experiment into an SMF with a core diameter of approx. 6 μm. Misalignment tolerances for efficient SMF coupling are determined through two-dimensional coupling efficiency scans, conducted for an attenuated diode laser beam. The coupling efficiency and the laser beam properties behind the SMF are investigated in dependence on the optical power in front of the SMF. A maximum power ex fiber of 3.5 W at a coupling efficiency of 65 % is reached.
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