董卓三国杀
专利名称：Coherent population trapping-bad
frequency standard and method for
generating a frequency standard
incorporating a quantum absorber that
generates the CPT state with high frequency 发明人：Miao Zhu青椒蛋炒饭
申请号：US09587717
岐山臊子的做法申请日：20000605
公开号：US06359916B1
公开日：
20020319
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摘要：The frequency standard compris a quantum absorber, source of incident electr-omagnetic radiation, detector, controller and signal output. The quantum absorber has a transition between a lower quantum state split by hyperfine interaction into two lower sub-state groups of at least one lower sub-state, and an upper quantum split by hyperfine interaction into upper sub-state groups of at least one upper sub-state. None of the upper sub-state groups is a cycling transition sub-state group having at least one allowed electric dipole transition to one lower sub-state group but none to the other. The upper quantum state differs in energy from a first lower sub-state in one of the lower sub-state groups and from a cond lower sub-state in the other of the lower sub-state groups by energy differences that correspond to frequencies of园艺专业学什么
&ohgr;and &ohgr;, respectively. The source is arranged to irradiate the quantum absorber with the incident electro-magnetic radiation that includes two main frequency components having frequencies equal to &ohgr;and &ohgr;. The detector generates a detection signal in respon to electro-magnetic radiation from the quantum absorber. The controller is responsive to the detection signal and controls the source to generate the main frequency components with a frequency difference that obtains an extremum in the detection signal. The extremum indicates that the frequency difference c
orresponds to an energy difference between the first and cond lower sub-states. The signal output provides a frequency standard signal related in frequency to the frequency difference.
申请人：AGILENT TECHNOLOGIES, INC.
代理人：Ian Hardcastle
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