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In quantum optics, superradiance is a phenomenon that occurs when a group of N emitters, such as excited atoms, interact with a common light field. If the wavelength of the light is much greater than the separation of the emitters, [2] then the emitters interact with the light in a collective and coherent fashion. [3]
Schematic representation of the difference between Dicke superradiance and the superradiant transition of the open Dicke model. The superradiant transition of the open Dicke model is related to, but differs from, Dicke superradiance. Dicke superradiance is a collective phenomenon in which many two-level systems emit photons coherently in free ...
Despite the original model of the superradiance the quantum electromagnetic field is totally neglected here. The oscillators may be assumed to be placed for example on the cubic lattice with the lattice constant in the analogy to the crystal system of the condensed matter. The worse scenario of the defect of the absence of the two out-of-the ...
A superradiant laser is a laser that does not rely on a large population of photons within the laser cavity to maintain coherence. [1] [2]Rather than relying on photons to store phase coherence, it relies on collective effects in an atomic medium to store coherence.
A familiar example is the perturbation (gentle tap) of a wine glass with a knife: the glass begins to ring, it rings with a set, or superposition, of its natural frequencies — its modes of sonic energy dissipation. One could call these modes normal if the glass went on ringing forever.
One important feature of a FROG measurement is that many more data points are collected than are strictly necessary to find the pulse electric field. For example, say that the measured trace consists of 128 points in the delay direction and 128 points in the frequency direction. There are 128×128 total points in the trace.
The stability analyses of the bubble, however, show that the bubble itself undergoes significant geometric instabilities due to, for example, the Bjerknes forces and Rayleigh–Taylor instabilities. The addition of a small amount of noble gas (such as helium , argon , or xenon ) to the gas in the bubble increases the intensity of the emitted light.
Uncertain what had happened but not considering the matter particularly urgent, the team at the Los Alamos National Laboratory, led by Ray Klebesadel, filed the data away for investigation. As additional Vela satellites were launched with better instruments, the Los Alamos team continued to find inexplicable gamma-ray bursts in their data.