Theoretical studies of standing and traveling wave lasers arepresented. The spectral behavior of the amplified spontaneous emission(superradiance) in a pencil-shaped column is investigated theoretically and experimentally. Spectral narrowing followed by rebroadeninghas been observed as predicted by the theory.
A geometrical representation of an interacting two-level atomicsystem has been developed and applied to an optical laser. A semi-classicalmodel for a standing wave laser has been examined using therotating wave approximation, and compared to the exact solution.Depth and width of the Lamb dip are determined theoretically andexperimentally. The effect of radial profile of the laser field hasbeen studied using the self-consistent-field approach, and the radiusof the beam was measured at various positions from the window.
