Short pulse dynamics in quantum cascade lasers

Since the first ever demonstration of the quantum cascade lasers (QCLs) in 1994, there has been extensive research on its improvement for various reasons. One of them is to produce ultrashort optical pulses. The nonlinearity in the index of refraction of a lasing medium can be manipulated to produce ultrashort laser pulses which have applications in the communication field, IC technology and even in surgical procedures. In this paper, we have modeled this dependency and have found that the pulse duration significantly increases in time when the pulse pulse intensity increases; however, the pulse duration significantly decreases in time when the pulse intensity increases.