A new transverse‐mode‐controlled laser called a buried multiquantum‐well (BMQW) laser has been developed. In order to make it possible to bury the MQW laser active region utilizing the diffusion‐induced disordering (DID) of GaAs‐GaAlAs MQW, zinc was selectively diffused into the MQW structure, resulting in a 3–8‐μm‐wide stripe region. The threshold current is as low as 33 mA with a 300‐μm cavity length and a fundamental transverse mode can be achieved. As a result of studying the relation of the waveguide geometry to the longitudinal and transverse modes it was concluded that this BMQW laser made by a simple DID process acts as an index‐guided laser.
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© 1984 American Institute of Physics.
1984
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