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Measurements of threshold crrent density and external efficiency on broad-area laser-waveguide structure have led to the determination of the optical loss and differential loss dα/dN ≃1.1–2.3 × 10−17cm2 at λ = 1.53μm in a λg 1.30μm GaInAsP layer. This measurement will be useful for the design of tunable lasers.
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Brosson et al. (1989) studied this question.
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