PARAMETRIC EFFECTS IN A TWO-LEVEL ELECTRIC DIPOLE SYSTEM
Abstract
In a two-level system with induced electrical dipole properties the relationship between an externally applied electric field and the expectation value of the dipole moment is expressed by a differential equation in which one coefficient is proportional to the instantaneous system energy. The nonlinear properties arising from this relationship allow parametric amplification of signals by pumping at another frequency, in the presence of a material containing active systems of this type. No population inversion is necessary. For optimum operation, both the pump and the signal should be within a few per cent of the natural frequency of the system. The electromagnetic Q required for parametric oscillations in a device of this sort is inversely proportional to the on-frequency absorption coefficient for the material. A numerical example shows that, at 1 millimeter wavelength, parametric oscillations will occur with a Q of 12,000 and a pump field of 10 kilovolts per centimeter in the gas. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1961
- Accession Number
- AD0267027
Entities
People
- J. Fontana
- R.h. Pantell
- Roger K. Smith
Organizations
- Stanford University