Abstract
We report the first use of Raman scattering to study GaAs/AlGaAs graded index-separate confinement heterostructure quantum-well lasers. We have used a forward scattering geometry in which the waveguide is endfired, and the light emerging from the opposite end facet is collected and spectrally analyzed. The probe is confined by the waveguide and thus interacts with the entire laser cavity. Because Raman scattering occurs in all regions of the heterostructure to which the optical mode is confined, this technique is a useful indication of the mode profile in waveguide heterostructures. We observe inhomogeneously broadened longitudinal and transverse optical phonons in the graded region.
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