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:
Feb. 11, 1997
Filed:
Jul. 19, 1994
Takushi Itagaki, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A surface-emitting LD array includes a plurality of surface-emitting LDs respectively including secondary diffraction gratings produced at the same pitch. These LDs are radially arranged on the substrate with a prescribed point on the substrate as the center of the radial arrangement so that the secondary diffraction gratings face to the center point. In this structure, the laser oscillation regions of the adjacent surface-emitting LDs are spaced apart from each other, so that the respective surface-emitting LDs are operated individually with high stability. As the result, when these surface-emitting LDs are oscillated with the same driving current, a high power laser light comprising a plurality of laser lights that are emitted from the respective LDs and have the same phase and the same wavelength is output stably in a prescribed direction. On the other hand, when these surface-emitting LDs are oscillated with different driving currents, a phase composite wave in which a plurality of laser lights having the same phase and different wavelengths are compounded is output stably in a prescribed direction.