Long-wavelength high-power quantum fountain unipolar lasers in GaAs/AlGaAs quantum wells

摘要

Abstract: High-power unipolar GaAs/AlGaAs lasers emitting in the 14-15 $mu@m wavelength range under optical pumping by a pulsed CO$-2$/ laser are investigated. Operation of edge lasers with side-facet pumping gas well as broad-area lasers with normal-incidence pumping is demonstrated. We show that record high optical powers can be obtained from these quantum fountain unipolar lasers. Optical powers per facet as high as 6.6 W for edge lasers and 7.8 W for broad-area lasers are achieved with TM$-00$/ mode emission. Extended tunability of the lasing wavelength, $Delta$lambda@/$lambda $APEQ 2.5 percent, is observed by varying the pump wavelength. Operating temperatures as high as 137 K are presently achieved. Application of quantum fountain unipolar lasers to CO$-2$/ gas detection is demonstrated. !25