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:
Jul. 13, 1999
Filed:
Jan. 22, 1998
Applicant:
Inventors:
Yan-Kuin Su, Tainan, TW;
Wen-Liang Li, Tainan, TW;
Shoou-Jinn Chang, Tainan, TW;
Chin-Yao Tsai, Tainan, TW;
Assignee:
National Science Council, , TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ; G02B / ;
U.S. Cl.
CPC ...
372 45 ; 385131 ;
Abstract
This invention is a new type of GaInP/AlGaInP for a visible separate-confinement-heterostructure strained quantum well(SCH-S-QW) laser with passive wave guides in the cladding layers. By using this structure, we can significantly improve the transverse beam divergence with only a slight increase of the threshold current. With proper choice of parameters, the transverse beam divergence as narrow as 18.degree.. FWHM can be achieved while the threshold current only becomes 1.12 factor than the lasers without the passive waveguide structure. This type of structure has three advantages: