Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Semiconductor laser device










Image Number 13 for United States Patent #5442649.

A semiconductor laser includes a semiconductor substrate of a first conductivity type, a gain guiding structure comprising of a first conductivity type, a lower cladding layer disposed on the substrate, an active layer disposed on the lower cladding layer and having a light emitting region, and an upper cladding layer of a second conductivity type, opposite the first conductivity type, disposed on the active layer, and a multiquantum barrier layer interposed between the upper cladding layer and the active layer excluding the light emitting region. In this structure, the multiquantum barrier layer reduces leakage current flowing outside of the light emitting region of the active layer and increases effective current flowing into the light emitting region, whereby the light output of the laser is significantly increased.








 
 
  Recently Added Patents
Level-shift circuit, electro-optical device, and level shift method
Systems and methods for vehicle cruise control
Image signal processing apparatus and image signal processing method
Identification wristband
Shared system to operationally connect logic nodes
Semiconductor device having trapezoidal shaped trenches
Recovering a database to any point-in-time in the past with guaranteed data consistency
  Randomly Featured Patents
Recording and reproduction of images
Radio communication apparatus and radio communication method
PC stand coated with rust inhibitor and method thereof
Computer graphics apparatus and method for interpolating control values to generate image data
Device with USB terminal
Means and method of forming sheet metal
Test and control access architecture for an integrated circuit
Liposome formulation of 5 .beta. steroids
Semiconductor device and method of manufacturing semiconductor device
Driving device for a recording medium