Tuneable unipolar lasers

US7696098B2 · kind B2 · utility

Assignee

• Nanoplus Ltd. · JP

Inventors

• Marc Fischer · Munich, DE
• Alfred Forchel · Coburg, DE

Key dates

• Filing date: Oct 12, 2007
• Grant date: Apr 13, 2010
• Expiry date: Oct 12, 2027

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S5/1215
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A unipolar semiconductor laser is provided in which an active region is sandwiched in a guiding structure between an upper and lower cladding layer, the lower cladding layer being situated on a semiconducting substrate. The unipolar semiconductor laser comprises a raised ridge section running from end to end between end mirrors defining the laser cavity. The ridge section aids in optical and electrical confinement. The ridge waveguide is divided in a plurality of cavity segments (at least two). Lattice structures can be arranged on and/or adjacent to these cavity segments. Each cavity segment is in contact with upper metallic electrodes. A metallic electrode coupled to the bottom surface of the semiconducting substrate facilitates current injection through the device.