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:
Sep. 21, 2004
Filed:
Oct. 12, 2001
Joshua B Paul, Brookline, MA (US);
James J Scherer, San Mateo, CA (US);
Anthony O'Keefe, Cupertino, CA (US);
Los Gatos Research, Inc., Mountain View, CA (US);
Abstract
This patent describes a new method and apparatus which allows optical cavities to be used simply and effectively as absorption cells for the purpose of performing sensitive absorption spectroscopy. This method introduces a continuous-wave light beam into the cavity using an off-axis cavity alignment geometry to systematically eliminate the resonances commonly associated with optical cavities, while preserving the absorption signal amplifying properties of such cavities. This reduces the complexity of the apparatus considerably compared with other optical cavity-based absorption methods when applied in conjunction with either cavity ringdown spectroscopy or integrated cavity output spectroscopy. This method can also be used to characterize other optical loss processes occurring within the cavity such as scattering or total extinction coefficients, and to determine the losses due to the cavity mirrors themselves (reflectometry).