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:
Nov. 01, 1994
Filed:
Sep. 13, 1993
Haruhisa Takiguchi, Nara, JP;
Kazuhiko Inoguchi, Nara, JP;
Hiroaki Kudo, Nara, JP;
Satoshi Sugahara, Nara, JP;
Mototaka Taneya, Nara, JP;
Sharp Kabushiki Kaisha, , JP;
Abstract
A semiconductor laser of the present invention includes: a semiconductor substrate, a multi-layered structure formed on the semiconductor substrate and a current and light confining section formed on the multi-layered structure, wherein the current and light confining section includes at least two multi-layered current and light confining portions each having a laser beam transmission layer and a laser beam absorption layer formed on the laser beam transmission layer, and at least one stripe groove which spatially separates the at least two current and light confining portions; wherein an equivalent refractive index in the multi-layered current and light confining portions with respect to a laser beam in a fundamental transverse mode is made smaller than that within the stripe groove; wherein the multi-layered structure includes an active layer, and the active layer has a region positioned below the stripe groove of the current and light confining section and regions positioned below a respective one of the multi-layered current and light confining portions; and wherein a optical confinement factor .GAMMA. of the active layer outside the stripe groove with respect to a laser beam in a guide mode is larger than that outside the stripe groove with respect to a laser beam in an anti-guide mode.