Atomic, molecular, and optical physics Atomic, molecular, and optical physics When coherent electromagnetic fields interact with multi-level atomic systems, coherence between levels may be induced. This state is called atomic coherence. ...more on Wikipedia about "Atomic coherence"
Atomic physics (or atom physics) is the field of physics that studies the electron hull of atoms. ...more on Wikipedia about "Atomic physics"
Atomic, molecular, and optical physics is the study of matter-matter and light-matter interactions on the scale of single atoms or structures containing a few atoms. The three areas are grouped together because of their interrelationships, the similarity of methods used, and the commonality of the energy scales that are relevant. Physicists sometimes abbreviate the field as AMO physics. All three areas include both classical and quantum treatments. ...more on Wikipedia about "Atomic, molecular, and optical physics"
The dark state is an interaction between matter and light, in which light can be "slowed down" or even stopped. In 2001, a team led by Lene Hau at Harvard University managed to bring a ray of light to a halt in a cold, oblong cloud of sodium atoms. This experiment has since been repeated with warm rubidium and more 'accurately' with cold caesium. Two laser beams are fired into the cloud- one a coupling beam, the other a signal beam- and if made to destructively interfere with each other will entangle the laser photons and the atoms in the gas. Dimming and eventually switching off the coupling beam will slow down the signal beam- to a complete stop if done correctly- thus storing the signal beam in this dark state. Turning the coupling beam back on again reverses the effect, although the light still interferes with the dark state atoms while at a halt. ...more on Wikipedia about "Dark state"
Molecular physics is the study of the physical properties of molecules and of the chemical bonds between atoms that bind them into molecules. Its most important experimental techniques are the various types of spectroscopy. The field is closely related to atomic physics and overlaps greatly with theoretical chemistry, physical chemistry and chemical physics. ...more on Wikipedia about "Molecular physics"
Optical physics, or optical science, is a subfield of atomic, molecular, and optical physics. It is the study of the generation of electromagnetic radiation, the properties of that radiation, and the interaction of that radiation with matter, especially its manipulation and control. It differs from general optics and optical engineering in that it is focused on the discovery and application of new phenomena. There is no strong distinction, however, between optical physics, applied optics, and optical engineering, since the devices of optical engineering and the applications of applied optics are necessary for basic research in optical physics, and that research leads to the development of new devices and applications. Often the same people are involved in both the basic research and the applied technology development. ...more on Wikipedia about "Optical physics"
Optics (appearance or look in ancient Greek) is a branch of physics that describes the behavior and properties of light and the interaction of light with matter. Optics explains and is illuminated by optical phenomena. ...more on Wikipedia about "Optics"
The rotating wave approximation is an approximation used in atom optics and magnetic resonance. In this approximation, terms in a Hamiltonian which oscillate rapidly are neglected. This is a valid approximation when the applied electromagnetic radiation is near resonance with an atomic resonance, and the intensity is low. Explicity, terms in the Hamiltonians which oscillate with frequencies , are neglected while terms which oscillate with frequencies are kept, where is the light frequency, and is a transition frequency. ...more on Wikipedia about "Rotating wave approximation"
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