Systematic description of laser phase by linearized Ito equations.
We show that well above threshold the use of linearized Ito quantum stochastic differential equation allow a systematic description of all quantum stochastic properties of laser light including the phase properties. This is accompanied by the use of mixed field-atom operators which are phase independent and around whose finite mean values we may linearize. As a consequence wee are able to derive an equation for an operator describing the phase properties of the laser light
Competing χ(2) Nonlinearities in a Cavity
The interaction between two cavity-resonant nonlinear processes in an intracavity χ(2) medium is studied, namely doubly resonant second harmonic generation and resonant nondegenerate down conversion. A closed set of semiclassical equations of motion for appropriately chosen quantities of the full system is derived and an explicit stationary solution is given. The most striking feature of this solution is a stable plateau in the second harmonic, i.e. the field of frequency ω 2 = 2ω 1 becomes independent of the pump field e 1, provided e 1 is larger than a certain threshold value. It is demonstrated that undamped selfpulsing can only prevail, if the ratio of the rates of second harmonic generation over parametric down conversion exceeds a value which depends solely on the relative damping rates of second harmonic and fundamental.
Far-field dispersal modeling for fuel-air-explosive devices
A computer model for simulating the explosive dispersal of a fuel agent in the far-field regime is described and is applied to a wide variety of initial conditions to judge their effect upon the resulting fuel/air cloud. This work was directed toward modeling the dispersal process associated with Fuel-Air-Explosives devices. The far-field dispersal regime is taken to be that time after the initial burster charge detonation in which the shock forces no longer dominate the flow field and initial canister and fuel mass breakup has occurred. The model was applied to a low vapor pressure fuel, a high vapor pressure fuel and a solid fuel. A strong dependence of the final cloud characteristics upon the initial droplet size distribution was demonstrated. The predicted fuel-air clouds were highly non-uniform in concentration. 18 refs., 86 figs., 4 tabs.