Theoretical Characteristics of Quantum Cascaded Lasers

Abstract

In this paper, we are concerned with the performance of the quantum cascaded lasers (QCLs) under two different cases, pulsed and continuous wave (PW, CW) operations. The dependence of PW and CW on QCLs parameters is declared. These parameters are width of the strip, number of stages and wavelengths. Also, proposed relations that link emitted power, threshold current, and slope efficiency with QCLs parameters are deduced. To verify the validity of these theoretical equations, comparison studies with experimental results are done. From comparison of the theoretical and experimental characteristic behaviors, the considered equations give satisfactory results. Furthermore, mathematical approximation for the maximum and minimum values of the output optical power is deduced.