Large-signal modulation in distributed feedback quantum cascade lasers for coherent multiharmonic signal generation |
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Authors: | Borja Jerez Rolf Szedlak Pedro Martín-Mateos Cristina de Dios Pablo Acedo Gottfried Strasser |
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Affiliation: | 1.Electronics Technology Department,Universidad Carlos III de Madrid,Leganés,Spain;2.Institute of Solid State Electronics,Technische Universit?t Wien,Vienna,Austria |
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Abstract: | In this Letter, an experimental analysis for coherent multiharmonic signal generation in quantum cascade lasers is presented. The underlying principle relies on the direct modulation of the laser with a large sinusoidal wave to drive the laser above and below threshold. This generates a multiharmonic optical signal in the frequency domain as the device is forced to respond in a nonlinear fashion. The impact of the modulation parameters is assessed in the resultant optical spectrum of a continuous-wave distributed feedback quantum cascade laser. Despite not creating pulses due to the ultrafast dynamics of the laser, the results reveal that a comb structure with uniform line spacing and high phase correlation between teeth can be straightforwardly generated. |
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