Results 241 to 250 of about 307,922 (287)
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Physical Review Letters, 1993
We observed a new type of sub-Doppler cooling that employs neither polarization gradients nor magnetic fields, and involves neither a damping force nor significant diffusive heating. Instead, light shifts combined with optical pumping (OP) to levels not coupled by the laser field gives transient cooling, and steady state is not achieved. The time scale
Padua, S. +5 more
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We observed a new type of sub-Doppler cooling that employs neither polarization gradients nor magnetic fields, and involves neither a damping force nor significant diffusive heating. Instead, light shifts combined with optical pumping (OP) to levels not coupled by the laser field gives transient cooling, and steady state is not achieved. The time scale
Padua, S. +5 more
openaire +2 more sources
Physics Today, 1987
In the photograph on the opposite page we see a single mercury ion held nearly at rest in an electromagnetic “trap.” Physicists have seen individual atoms before, in arrays imaged by field ion microscopes and more recently by vacuum tunneling microscopes, but what we see here is different.
David J. Wineland, Wayne M. Itano
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In the photograph on the opposite page we see a single mercury ion held nearly at rest in an electromagnetic “trap.” Physicists have seen individual atoms before, in arrays imaged by field ion microscopes and more recently by vacuum tunneling microscopes, but what we see here is different.
David J. Wineland, Wayne M. Itano
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Laser cooling of lithium using relay chirp cooling
Optics Letters, 1992We demonstrate a chirp-cooling technique that uses a laser with multiple FM sidebands to slow lithium atoms from initial velocities of as much as 1880 m/s to final velocities near zero. Compared with the use of a single sideband, this multisideband technique significantly reduces FM bandwidth requirements and provides a greater flux of slowed atoms.
C C, Bradley +5 more
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Thermoelectrically Cooled GaAlAs Laser Illuminator
Applied Optics, 1970Required operating wavelengths in GaAs injection lasers have generally determined the operating temperature, preventing the use of optimum refrigeration systems. Recent advances in GaAIAs injection lasers have produced high efficiency lasers with selectable wavelengths from 0.8 microm to 0.9 microm. This paper discusses the refrigeration considerations
D G, Herzog, H, Kressel
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Laser-Cooled-Atomic Frequency Standard
Physical Review Letters, 1985The first frequency standard based on laser-cooled atoms is reported. Beryllium atomic ions were stored in a Penning trap and cooled by radiation pressure from a laser. The frequency of the $^{9}\mathrm{Be}^{+}$ $({M}_{I}, {M}_{J})=(\ensuremath{-}\frac{3}{2}, +\frac{1}{2})\ensuremath{\leftrightarrow}(\ensuremath{-}\frac{1}{2}, +\frac{1}{2})$ ground ...
, Bollinger +3 more
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Can Laser Light Cool Semiconductors?
Physical Review Letters, 2004Laser cooling in semiconductors is theoretically investigated including arbitrary external efficiency and photon recycling. Experimental conditions needed to attain net cooling in GaAs are derived.
Mansoor, Sheik-Bahae, Richard I, Epstein
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Applied Optics, 1976
It is demonstrated that He-CO and He-air-CH$sub 4$ lasers perform better when operated with liquid argon cooling at 87.3$sup 0$K than with liquid nitrogen cooling at 77.35$sup 0$K.
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It is demonstrated that He-CO and He-air-CH$sub 4$ lasers perform better when operated with liquid argon cooling at 87.3$sup 0$K than with liquid nitrogen cooling at 77.35$sup 0$K.
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Il Nuovo Cimento C
We present the first successful demonstration of broadband laser cooling of positronium (Ps) atoms within the AEgIS experiment at CERN. By employing a custom-designed pulsed alexandrite laser system at 243 nm with 70 ns long pulses and enough energy to saturate the 1 $ ^3$S-2 $ ^3$P transition over a 360 GHz spectral range, we reduced the temperature ...
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We present the first successful demonstration of broadband laser cooling of positronium (Ps) atoms within the AEgIS experiment at CERN. By employing a custom-designed pulsed alexandrite laser system at 243 nm with 70 ns long pulses and enough energy to saturate the 1 $ ^3$S-2 $ ^3$P transition over a 360 GHz spectral range, we reduced the temperature ...
openaire +1 more source