Abstract
This chapter provides an exhaustive report on device modeling and applications of QCL from the recently available articles. Terahertz quantum cascade-lasers (THz QCLs) operating in pulsed mode and at higher temperatures produce larger optical power. Predicting device characteristics in pulsed mode becomes a nontrivial activity, involving the device parameters. Terahertz quantum cascade-lasers operating in pulsed mode and at higher temperatures produce larger optical power. Predicting device characteristics in pulsed mode becomes a nontrivial activity, involving the device parameters. In resonantly stimulated nanostructures, and second-order optical nonlinearities can be considerably amplified. As a result of massive destructive interference effects, the second-order nonlinear susceptibility can vary by order of magnitude. The manufacture and characterization of mid-infrared AllnAs/InGaAs/InP QCLs taper quantum cascade lasers are fully described. The tapered shape of the resonator is used to boost output power while maintaining acceptable beam quality.
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