Kassahun, Fesseha (PhD)Tesfa, Sintayehu2018-07-032023-11-092018-07-032023-11-091997-06http://10.90.10.223:4000/handle/123456789/5735The squeezing and the statistical properties as well as the spectrum of the radiation resulting from the interaction of two-level atoms with a sqneezed vacuum is analyzed. We have considered the case in which the two-level atoms, all initially in the upper level, are placed in a squeezed vacuum. We have also considered the case in which the atoms, initially with nearly equal number in each level, are confined in a cavity coupled to a squeezed vacuum. The quadrature fluctuations, the photon number distribution and the spectrum of the the radiation are calculated using the Q-function formalism. The Q-function is determined applying the method of evaluating the propagator developed by Fesseha [19,20]. The radiation is found out to be in a squeezed state for certain period of time in the first case and for all times in the second case. It is also shown that one effect of the squeezed vacuum is to increase the height of the spectrum of the radiationenInteraction of Two-Level AtomsThesis