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• W2149076009 abstract "A comprehensive model for the photon number fluctuations and the current noise in quantum cascade lasers is presented. It is shown that the photon intensity noise in quantum cascade lasers exhibits little amplitude squeezing even when noise in the drive current is suppressed below the shot noise value. This is in contrast to interband semiconductor diode lasers in which the laser intensity noise can be squeezed well below the shot noise limit by high impedance suppression of fluctuations in the drive current. The theoretical model presented in this paper self-consistently accounts for the suppression of current noise in electron transport in multiple quantum well structures due to various electronic correlations. The nature of these electronic correlations is discussed. Mechanisms responsible for the reduced photon number squeezing in intersubband lasers are elucidated. Scaling of the laser intensity noise and the current noise with the number of cascaded gain stages is also described. Direct current modulation response of quantum cascade lasers is also studied, and it is shown that contrary to the predictions in the literature of terahertz modulation bandwidth for these lasers, bandwidth of almost all quantum cascade lasers that have been reported in the literature is limited by the inverse photon lifetime inside the laser cavity to tens of gigahertz." @default.
• W2149076009 created "2016-06-24" @default.
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• W2149076009 date "2002-03-12" @default.
• W2149076009 modified "2023-09-25" @default.
• W2149076009 title "Current noise and photon noise in quantum cascade lasers" @default.
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• W2149076009 doi "https://doi.org/10.1103/physrevb.65.125313" @default.
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