High-Power and Low-Threshold-Current-Density GaAs/AlGaAs Quantum Cascade Lasers
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Abstract
We report on the realization of GaAs/AlGaAs quantum cascade lasers with an emission wavelength of 9.1μm above the liquid nitrogen temperature. With optimal current injection window and ridge width of 24 and 60μm respectively, a peak output power more than 500mW is achieved in pulsed mode operation. A low threshold current density Jth=2.6kA/cm2 gives the devices good lasing characteristics. In a drive frequency of 1kHz, the laser operates up to 20% duty cycle.
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