The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2007
Filed:
Oct. 18, 2004
Miao Zhu, San Jose, CA (US);
Leonard S. Cutler, Los Altos Hills, CA (US);
John Edwin Berberian, Dallas, TX (US);
Miao Zhu, San Jose, CA (US);
Leonard S. Cutler, Los Altos Hills, CA (US);
John Edwin Berberian, Dallas, TX (US);
Agilent Inc., Santa Clara, CA (US);
Abstract
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, ν, 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, ν, 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 νis used by a number of servo loops. One of the servo loops determines the value of νthat minimizes or maximizes the detector signal and a second servo loop determines an offset signal that reduces the dependence of νon the intensity of the first radiation source.