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. 27, 2014
Filed:
May. 18, 2011
Kazuhiro Harasaka, Miyagi, JP;
Shunichi Sato, Miyagi, JP;
Masahiro Hayashi, Miyagi, JP;
Akihiro Itoh, Miyagi, JP;
Katsunari Hanaoka, Kanagawa, JP;
Kazuhiro Harasaka, Miyagi, JP;
Shunichi Sato, Miyagi, JP;
Masahiro Hayashi, Miyagi, JP;
Akihiro Itoh, Miyagi, JP;
Katsunari Hanaoka, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A surface-emitting laser device includes a transparent dielectric layer provided in an emitting region and configured to cause a reflectance at a peripheral part to be different from a reflectance at a central part in the emitting region. In the surface-emitting laser device, the thickness of a contact layer is different between a region having a relatively high reflectance and a region having a relatively low reflectance in the emitting region. The contact layer is provided on the high refractive index layer of an upper multilayer film reflecting mirror, and the total optical thickness of the high refractive index layer and the contact layer in the region having the relatively low reflectance is deviated from an odd number multiple of a one quarter oscillation wavelength of laser light emitted from the emitting region.