Filtering by
The response of a molecular sheet with varying densities of simple, two-level system without lasing due to an ultra-short, wideband pulse centered at 2 eV is first investigated. The Fabry-Pérot modes rising from interference are observed, as well as the expected redshift in the transmission and reflection frequencies in the thin molecular sheet regime. Cautions regarding numerical instability and implementation of the Fast Fourier Transform are discussed. Upon activating the lasing levels of the molecules (creating a four-level system), the transmission and refection responses are measured for four combinations of molecular density and molecular sheet thickness. Lasing threshold and saturation phenomenon are observed and a clear lasing region is seen in the Power input/output analysis.
Population inversion is driving force that triggers lasing through stimulated emission. To investigate this, the populations of each of the four molecular energies levels are tracked for the same combinations of parameters in the previous tests. The population inversions and the threshold/saturation phenomena do not correspond to within reasonable limits. Inspection of the population data reveals a highly varied distribution within the molecular, suggesting that the system does not reach steady-state, and therefore and alternate method of analysis will need to be developed.
Having experimented with the simulations above, both the development of appropriate population analysis framework and the investigation of higher order dimensions (2-D and 3-D) will be pursed.
In the quark model, meson states consisting of a quark/anti-quark pair must obey Poincaré symmetry. As a result of that symmetry, for meson total angular momentum J, parity P, and charge conjugation symmetry C, states with JPC= 0--, 0+-, 1-+, 2+-, 3-+, 4+-, … should not be observed. A meson observed experimentally with such quantum numbers would indicate a so-called “exotic” meson state. Exotic mesons can be multi-quark states like tetraquarks, a combination of two or more gluons known as glueballs, or a hybrid meson (qqg). Theories have suggested that three possible exotic meson states with the 1-+ quantum number: π1, η1, and η‘1,. However, no conclusive evidence for the existence of these three exotic states has been observed. This research will look for new states that decay to K* K final states with an emphasis on exotic mesons. An analysis of K+ K- π0 final states will be presented, where a restriction on the K - π0 invariant mass yields an unexpected enhancement in the K+ K- π0 spectrum.