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External cavity spectral beam combining of 4.6 µm emitting quantum cascade laser arrays

: Ostendorf, R.; Hugger, S.; Aidam, R.; Bronner, W.; Fuchs, F.; Lösch, R.; Yang, Q.K.; Wagner, J.; Romasew, E.; Raab, M.; Tholl, H.D.

Institute of Electrical and Electronics Engineers -IEEE-:
ISLC 2010, 22nd IEEE International Semiconductor Laser Conference : Kyoto, Japan, 26-30 September 2010
Piscataway/NJ: IEEE, 2010
ISBN: 978-1-4244-5682-6
ISBN: 978-1-4244-5683-3
ISBN: 1-4244-5683-5
International Semiconductor Laser Conference (ISLC) <22, 2010, Kyoto>
Fraunhofer IAF ()
quantum cascade laser; QC laser; power scaling; spectral beam combining; external cavity; micro lens array; coupling efficiency

Spectral beam combining of linear arrays of quantum cascade (QC) lasers emitting at 4.6 µm is demonstrated as a viable approach towards power-upscaling. By using an external cavity setup equipped with a diffraction grating and a partially transmitting output mirror providing wavelength selective feedback to each emitter, up to 8 individual QC lasers are combined with an optical coupling efficiency of 60% for an array of 6 emitters. The resulting beam quality (M2<2 for both fast and slow axis) is close to that observed for single emitters.