5.3 W cw output power from a Master Oscillator Power Amplifier at 1083 nm

B. Sumpf^a, S. Schwertfeger^a, J. Wiedmann^b, A. Klehr^a, F. Dittmar^a, G. Erbert^a, G. Tränkle^a

^a Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
^b eagleyard Photonics GmbH, Rudower Chaussee 29 (IGZ), 12489 Berlin, Germany

Published in:
Conference Optics East 2005 Optoelectronic devices; Physics, Fabrication, and Application II Proc. SPIE Vol. 6013 S.60130C-1 - 60130C-12.
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Abstract:
A master-oscillator power-amplifier system at λ= 1083 nm with 5.3 Watt output power and a narrow spectral linewidth was realised. The master oscillator was a distributed Bragg reflector (DBR) laser with a 3-µm wide ridge waveguide (RW) and a total length of 2 mm. The power amplifiers were a 4 mm long antireflection coated tapered laser diodes with 500 µm or 1000 µm long straight RW sections. At a temperature of 40°C and an injection current of 160 mA, the DBR laser had a wavelength of 1083 nm. The emitted light of the DBR laser was focused into the tapered amplifier with a seed power of up to 36 mW. At 10°C and at a current through the tapered amplifier of 8.6 A, a maximum output power of 5.3 W was measured. Over the full operating range single longitudinal mode operation at a wavelength of λ= 1083 nm was maintained with a side mode suppression ratio better than 35 dB. The vertical far field angle was below 22° (FWHM).

Keywords:
MOPA, DBR laser, tapered amplifier, high-power, diffraction limited radiation

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