Agilent Technologies, Inc.

Agilent Inc.

John Edwin Berberian

Miao Zhu

Leonard S Cutler

An apparatus and method for measuring CPT is disclosed. The apparatus includes a quantum absorber that is irradiated by radiation from an electromagnetic radiation source. The quantum absorber includes a material that exhibits CPT. The electromagnetic radiation source generates electromagnetic radiation having first and second CPT-generating frequency components. The first CPT-generating frequency component has a frequency &#x3bd;L&#x2212;&#x3bd;, and a first CPT component amplitude. The second CPT generating frequency component has a frequency &#x3bd;+&#x3bd; and a second CPT component amplitude. The apparatus also includes a detector for generating a detector signal related to the power of electromagnetic radiation that leaves the quantum absorber. The detector signal exhibits an asymmetry as a function of frequency &#x3bd; in a frequency range about a frequency &#x3bd;. The apparatus includes an asymmetry servo loop that alters one of &#x3bd;, the first CPT component amplitude, and the second CPT component amplitude to reduce the asymmetry.

Method and apparatus for reducing errors due to line asymmetry in devices utilizing coherent population trapping

An apparatus for generating a stabilized frequency signal is disclosed. The apparatus includes a quantum absorber having first, second, and third energy states. The quantum absorber is irradiated by a first radiation source that generates electromagnetic radiation having a frequency, &#x3bd;, that induces transitions between the first and third energy states. The quantum absorber is also irradiated by a second radiation source that generates electromagnetic radiation having a frequency, &#x3bd;, that induces transitions between the first and second energy states. A detector that generates a detector signal indicative of the level of radiation leaving the quantum absorber in a frequency range including &#x3bd;is used by a number of servo loops. One of the servo loops determines the value of &#x3bd;that minimizes or maximizes the detector signal and a second servo loop determines an offset signal that reduces the dependence of &#x3bd;on the intensity of the first radiation source.

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Dallas, TX, United States of America

John Edwin Berberian