Resources Contact Us Home
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
Biomarkers of gastric cancer and use thereof
Methods and apparatus for performing multiple photoresist layer development and etching processes
Method, base station and system for adjusting cell wireless configuration parameter
Devices including composite thermal capacitors
ZNF217 a new prognostic and predictive biomarker of recurrent invasive and metastatic phenotypes in breast cancer
Pattern forming method using printing device and method of manufacturing liquid crystal display device using the same
Tray for microwave cooking and folding of a food product
  Randomly Featured Patents
Protective foot covering
Iconic access to remote electronic monochrome raster data format document repository
PEG-urate oxidase conjugates and use thereof
Method of electrically connecting conductive railroad attachment
Fundus blood flowmeter
Tool for mounting a belt in a groove of a pulley
Sensor tilt control for a digital camera
Peptide compounds and compositions
Method bacterial endospore quantification using lanthanide dipicolinate luminescence
Dust receptacle fixing/separating apparatus and a cyclone dust collecting device having the same