Study and analysis of the optical absorption cross section and energy states broadenings in quantum dot lasers.

In this report, we measured experimentally the modal absorption spectra of the InP and InAsP quantum dot (QD) lasers using multi-section device technique. The optical absorption cross section ( ) and inhomogeneous broadening for the ground state (GS) and excited state (ES) were analyzed and calculated theoretically from the absorption spectra. The results showed that the InP QD laser exhibited to be and for GS and ES respectively, whereas for the InAsP QD material it was found as and for GS and ES respectively.