Kassahun, Fesseha (PhD)Kebede, Tesfaye2018-07-052023-11-092018-07-052023-11-091999-01http://10.90.10.223:4000/handle/123456789/6636We present a detailed derivation ofthe c-number Langevin equations for a laser coupled to a squeezed vacuum reselVoir fi'om the conesponding operator Langevin equations. Employing these equations we investigate the effects of the squeezed vacmUll on the photon statistics, the spectnllll of intensity fluctuations, squeezing spectrum and the power spectnllll for a laser operating below tln·eshold. The same set of equations are also used to study the effects of the squeezed vacuum on the photon statistics, the power spectrum, and spectmm of intensity fluctuations for a laser operating above threshold. We find that the intensity fluctuations and laser linewidth depend on the relative phase between the squeezed vacuum and the laserenLaser dynamicsThesis