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The threshold current density of multiple and single quantum well lasers as a function of cavity length has been investigated. A dramatic change of the lasing wavelength and a strong increase of the threshold current density is observed for a single quantum well laser when the cavity length is reduced to ∼400 μm. In addition, discrete widely separated wavelength switching with changes up to 50 nm is achieved using an intracavity electroabsorption region.
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Berthold et al. (1990) studied this question.
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