Transient laser cooling of two-level quantum systems with narrow natural linewidths

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作者：
Hungarian Acad of Sciences, Budapest, Hungary [1 ]
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Phys Rev A | / 4卷 / 2885-2888期
关键词：
Atoms - Cooling - Electromagnetic fields - Electron energy levels - Laser pulses - Matrix algebra - Photons - Quantum theory - Relaxation processes - Temperature - Velocity;
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摘要：
A scheme of transient laser cooling of quantum system with a narrow transition linewidth by a sequence of counterpropagating ultrashort laser pulses with special frequency chirping is proposed and investigated. The laser cooling scheme consists of two steps. First, a velocity-selective excitation of the ensemble of two-level quantum system is produced by a frequency chirped laser pulse. This then allows the movement of the distributions of the excited and unexcited quantum systems toward each other in velocity space.
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