Laser diode

Abstract

Abstract PURPOSE:To readily form a distributed feedback type laser by forming a stress field formed periodically along the laser light popagating direction. CONSTITUTION:Grooves 7 are formed at constant interval at the side of soldering portion 5 of a contact layer 3 in a distributed feedback type laser having an active layer 1, a clad layer 2, a contact layer 3, and a head sink 4 and the like, thermal expansion coefficient difference between the layer 3 and the heat sink 4 and stress caused by high temperature at the time of soldering is retained, and a stress field is formed thereat. A periodical refractive index distribution is formed along the light propagating direction in a waveguide, so that the resonant spectrum coincident to the resonant mode is strongly excited. A metallic electrode 8 and an insulator 9 are disposed on the layer 3, and stress caused by the thermal expansion coefficient difference is formed thereat, or the thickness of the clad layer 3 is periodically varied, and a stress field may be formed.

Inventors

• 👤 Saburo Takamiya
• 👤 Hirobumi Namisaki
• 👤 Wataru Suzaki

Bibliographic Details