Results 201 to 210 of about 18,289 (228)

Condensed-phase optical refrigeration

Journal of the Optical Society of America B, 2003
We review progress on laser cooling of solids. The general process that enables cooling to occur is based on anti-Stokes fluorescence. Candidate materials for laser cooling are discussed, including gases, dyes, crystals, semiconductors, and ionically doped glasses.
Rayner, Anton, Heckenberg, Norman R., Rubinsztein-Dunlop, Halina   +2 more
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All-optical Bose-Einstein condensates

Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, 2003
Summary form only given. Recently, we have created a Bose condensate of /sup 87/Rb atoms directly in an optical trap formed by tightly focused laser beams. Following initial loading from a laser cooled gas, evaporative cooling through the BEC transition is achieved by simply lowering the depth of the optical trap.
M.D. Barrett, J.A. Sauer, M.S. Chapman
openaire   +1 more source

Condensation of classical optical waves

Advanced Photonics & Renewable Energy, 2010
We demonstrate the nonlinear condensation of classical optical waves. The condensation is observed directly, as a function of nonlinearity and wave kinetic energy, in a self-defocusing photorefractive crystal.
Sun, Can, Barsi, Christopher, Jian, Shia, Picozzi, Antonio, Rica, Sergio, Fleischer, J.W   +5 more
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Optical switching by capillary condensation

Nature Photonics, 2007
Photonic materials, which have optical properties that can be modulated by light, are extremely interesting both for their fundamental properties as well as for their potential in the applications of all-optical signal processing and possibly optical computing(1).
P. Barthelemy, M. Ghulinyan, Gaburro, Zeno, C. Toninelli, Pavesi, Lorenzo, D. S. Wiersma   +5 more
openaire   +4 more sources

Optically Confined Bose–Einstein Condensates

Journal of Low Temperature Physics, 1998
With an optical dipole trap it is possible to confine Bose–Einstein condensates in different hyperfine states and in arbitrary magnetic bias fields, thus overcoming two major limitations of magnetic traps. In this review paper we characterize the properties of such a dipole trap and we summarize experiments which made use of the new experimental ...
J. Stenger, D.M. Stamper-Kurn, M.R. Andrews, A.P. Chikkatur, S. Inouye, H.-J. Miesner, W. Ketterle   +6 more
openaire   +1 more source

Optically-Excited Polariton Condensates

2020
The observation of polariton condensation with the help of high-quality optical microcavities was a long sought goal in solid-state research. Optical pumping of planar microresonator structures consisting of multiple quantum wells as active region offers a common and direct path towards exciton–polariton studies.
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Cone Channel Condenser Optics*

Journal of the Optical Society of America, 1952
Conical light pipes to condense radiation are attractive in their simplicity and low cost.In addition, when using detectors having non-uniform surface response, the non-image forming characteristics of such channels are desirable. Through the use of a field lens, channels may be designed which condense the radiation through a given area to the smallest
openaire   +1 more source

Theory of optical spectra of exciton condensates

Physical Review B, 1996
We present theoretical calculations of optical absorption-gain spectra for condensed excitons in both three dimensional (3D), 2D, and quasi-2D systems (appropriate for semiconductor quantum wells) as functions of the electron-hole pair density and temperature.
, Chu, , Chang
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Patterned Condensation Figures as Optical Diffraction Gratings

Science, 1994
Heterogeneous, patterned surfaces comprising well-defined hydrophobic and hydrophilic regions and having micrometer-scale periodicities were prepared by patterning the adsorption of ω-functionalized alkanethiolates in self-assembled monolayers (SAMs) on gold.
A, Kumar, G M, Whitesides
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Anamorphic Condensing Optics for a Slitless Spectrograph

Applied Optics, 1970
The use of a slitless spectrograph to obtain the spectra of wakes of hypervelocity projectiles launched in a free flight ballistic range has several advantages. The use of this instrument as a general spectroscopic tool is, however, especially limited for large objects.
J R, Baskett, I D, Liu
openaire   +2 more sources