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Adaptive secondary mirrors
Adaptive secondary mirrors

... pupil isn’t sampled well ...
Self-rotation of resonant elliptically polarized light in collision
Self-rotation of resonant elliptically polarized light in collision

... Self-rotation in resonant atomic vapors, also caused by induced polarization of the medium, has been studied since the late 1960’s. The original interest in SR in atomic vapors was related to understanding the polarization of gas laser emission [17]. Later, SR was theoretically examined [18–21] in t ...
Realization of an Optomechanical Interface
Realization of an Optomechanical Interface

... 3  1014 m= Hz. We observe that !m decreases with increasing lattice laser power, and measure !m =2 ¼ 244 kHz at P ¼ 76 mW. We attribute this to reduced tensile stress due to thermal expansion of the membrane, which is locally heated by the lattice laser [25]. The mechanical quality factor Q ¼ !m ...
Optically detecting the quantization of collective atomic motion
Optically detecting the quantization of collective atomic motion

MICROWAVE MANIPULATION OF COLD ATOMS
MICROWAVE MANIPULATION OF COLD ATOMS

Specular Reflection of Very Slow Metastable Neon Atoms from a
Specular Reflection of Very Slow Metastable Neon Atoms from a

Chapter 7
Chapter 7

chapter 2 photons and atoms
chapter 2 photons and atoms

... for explaining virtually all known optical phenomena. For optical phenomena, this theory is also referred to as quantum optics. • it is possible to derive many of the quantum-mechanical properties of light and its interaction with matter by supplementing electromagnetic optics with a few simple rela ...
Quantum gases in optical lattices
Quantum gases in optical lattices

Second-order coupling between excited atoms and surface polaritons
Second-order coupling between excited atoms and surface polaritons

... forces between atoms or molecules and macroscopic bodies are manifestations of the zero-point energy of the electromagnetic vacuum [1]. They occur even if the atom and the macroscopic body are in their respective (unpolarized) ground states [2] and can be understood—at least, in the nonretarded limi ...
Quantum interference of a single spin excitation with a
Quantum interference of a single spin excitation with a

Ch 7
Ch 7

Quantum State Control via Trap-induced Shape Resonance in
Quantum State Control via Trap-induced Shape Resonance in

... The ability to arbitrarily manipulate the quantum state of a many-body ensemble represents the ultimate control of a physical system. This task has steadily advanced in atomic-molecular-optical systems with tremendous progress in cooling and trapping technology. This has led to the creation of Bose- ...
Bose-Einstein Condensate: Bridge between Matter/non
Bose-Einstein Condensate: Bridge between Matter/non

Two-photon cooling of magnesium atoms
Two-photon cooling of magnesium atoms

Physical Science Test #1 – Review Guide Properties of Matter
Physical Science Test #1 – Review Guide Properties of Matter

... 19. A __________________________ is made up of more than one kind of atom or molecule in the same place at the same time (but those atoms or molecules are NOT bonded together). 20. ________________________________ are made up of one kind of atom; for example: carbon, oxygen, hydrogen, sodium, or chl ...
AP Formula Sheet with Explanations
AP Formula Sheet with Explanations

Precision spectroscopy using quantum superposition of atomic levels
Precision spectroscopy using quantum superposition of atomic levels

... ion 9 Be+ , trapped in the rf Poul trap. This CNOT gate is a paradigm of quantum computing because sufficient for universal quantum computation is CNOT operation plus a simple qubit rotation. In CNOT gate on a single ion, quantum entanglement between internal atomic state and motional state are crucia ...
Photon Sidebands of the Ground State and First Excited State of a
Photon Sidebands of the Ground State and First Excited State of a

Formula Charts
Formula Charts

... T is the temperature in Kelvin R is the gas constant = 8.314 P is the pressure V is the volume in liters n represents moles R is the ideal gas constant T is the temperature in Kelvin PA is the partial pressure of “A” XA is the mole fraction of “A” PX is the partial pressure of “X” KE is the kinetic ...
ppt of slides
ppt of slides

... Atoms trapped in an optical lattice move due to quantum tunneling even if the potential depth of the lattice point exceeds the kinetic energy. Strongly interacting limit. However when the well depth is large then the interaction energy of the atoms become more than the hopping energy, then the atom ...
Four-wave mixing with matter waves
Four-wave mixing with matter waves

Transient Dynamics of Atoms Between Parallel Conducting Plates 1
Transient Dynamics of Atoms Between Parallel Conducting Plates 1

Laser Chemosensor with Rapid Responsivity and Inherent Memory
Laser Chemosensor with Rapid Responsivity and Inherent Memory

1 ¡ pu{cq2
1 ¡ pu{cq2

< 1 ... 19 20 21 22 23 24 25 26 27 ... 49 >

Population inversion

In science, specifically statistical mechanics, a population inversion occurs while a system (such as a group of atoms or molecules) exists in a state with more members in an excited state than in lower energy states. It is called an ""inversion"" because in many familiar and commonly encountered physical systems, this is not possible. The concept is of fundamental importance in laser science because the production of a population inversion is a necessary step in the workings of a standard laser.
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