| 摘要 |
PURPOSE:To obtain two different wavelengths by forming current injection regions to a section just above a groove section between two parallel ridges on a substrate and a section just above an active-layer bent section generated by a stepped section on the outside of a ridge section. CONSTITUTION:When currents are injected in order to drive a laser C formed in ridge sections, beams generated in an active layer are confined in a groove section between the ridges and oscillate because they are absorbed to a substrate 1 on the ridges. On the other hand, when currents are injected in order to drive a laser D formed in a stepped section, beams generated in the active layer are confined in the active-layer bent section of the stepped section and oscillate because they are absorbed to the substrate 1 in a flat section except the stepped section. Since a growth rate in the active-layer bent section as the oscillating section of the laser D is faster than that in the oscillating section of the laser C, the wavelength of oscillation of the laser D is made longer than that of the laser C, and two different wavelengths can be obtained.
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