Abstract
High-power unipolar GaAs/AlGaAs lasers emitting in the 14-15 micrometers wavelength range under optical pumping by a pulsed CO<SUB>2</SUB> 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<SUB>00</SUB> mode emission. Extended tunability of the lasing wavelength, (Delta) (lambda) /(lambda) approximately equals 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<SUB>2</SUB> gas detection is demonstrated.
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