US Patent Issued to HAMAMATSU PHOTONICS on Oct. 27 for "Surface-emitting laser device" (Japanese Inventors)

ALEXANDRIA, Va., Oct. 27 -- United States Patent no. 12,776,626, issued on Oct. 27, was assigned to HAMAMATSU PHOTONICS K.K. (Hamamatsu, Japan).

"Surface-emitting laser device" was invented by Kazuyoshi Hirose (Hamamatsu, Japan), Masahiro Hitaka (Hamamatsu, Japan), Hiroki Kamei (Hamamatsu, Japan) and Takahiro Sugiyama (Hamamatsu, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A surface-emitting laser device includes a first electrode, a lower cladding layer, an active layer, an upper cladding layer, a relaxation layer, a contacting layer having a bandgap different from that of the upper cladding layer, a second electrode, and a photonic crystal layer provided between the lower cladding layer and the ac...