High cw power using an external cavity for spectral beam combining of diode laser-bar emission.
In extension to known concepts of wavelength-multiplexing diode laser arrays, a new external cavity is presented. The setup simultaneously improves the beam quality of each single emitter of a standard 25 emitter broad-area stripe laser bar and spectrally superimposes the 25 beams into one. By using this external resonator in an "off-axis" arrangement, beam qualities of Mslow2<14 and Mfast2<3 with optical powers in excess of 10 W in cw operation are obtained.
Jechow
Andreas
A
University of Potsdam, Germany. ajechow@uni-potsdam.de
Raab
Volker
V
Menzel
Ralf
R