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:
May. 20, 2008
Filed:
Aug. 08, 2003
Applicant:
Siyuan Yu, Bristol, GB;
Inventor:
Siyuan Yu, Bristol, GB;
Assignee:
The University of Bristol, Bristol, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 3/10 (2006.01); H01S 3/083 (2006.01);
U.S. Cl.
CPC ...
Abstract
A tunable lasing device () comprising a ring-shaped laser cavity (), an optical gain element (), a bi-directional output coupler () and a frequency selection means (). The frequency selection means is generally a grating with a refractive index that determines a grating reflection frequency. Single mode laser operation is achieved where a cavity mode frequency of the ring-shaped laser cavity coincides with a grating reflection frequency. The refractive index of the grating can be modified by the injection of a variable current. In this way, the lasing frequency can be rapidly tuned between cavity mode frequencies.