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:
Jan. 13, 2009
Filed:
Aug. 22, 2006
Mitigation of photodarkening to achieve laser oscillation and amplification with highly doped fibers
Supriyo Sinha, Menlo Park, CA (US);
Michel J. F. Digonnet, Palo Alto, CA (US);
Robert L. Byer, Stanford, CA (US);
Jens Limpert, Jena, DE;
Supriyo Sinha, Menlo Park, CA (US);
Michel J. F. Digonnet, Palo Alto, CA (US);
Robert L. Byer, Stanford, CA (US);
Jens Limpert, Jena, DE;
The Board of Trustees of the Leland Stanford Junior University, Palo Alto, CA (US);
Abstract
Photodarkening in active fiber or waveguide devices (e.g. lasers, amplifiers, and incoherent sources such as ASE sources) can be reduced by altering the dopant concentration along the length of the doped fiber. A fiber or waveguide device includes two or more intentionally doped fiber or waveguide sections having different concentrations of one or more dopants. The dopants provide optical gain responsive to pump radiation provided to the fiber device by a pump source. A first optical intensity in a first of the fiber or waveguide sections is greater than a second optical intensity in a second of the fiber or waveguide sections. A first dopant concentration in the first fiber or waveguide section is lower than a second dopant concentration in the second fiber or waveguide section. Thus the dopant concentration is reduced in sections of the fiber or waveguide device having a higher optical intensity. The optical intensity can be due to pump radiation and/or signal radiation. Reduced dopant concentration in regions of high optical intensity reduces photodarkening.