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Large-signal modulation in distributed feedback quantum cascade lasers for coherent multiharmonic signal generation

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URI: https://hdl.handle.net/10016/31440
ISSN: 0306-8919
ISSN: 1572-817X (online)
DOI: https://doi.org/10.1007/s11082-018-1619-5
UXXI: AR/0000022004
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large_OQE_2018_ps.pdf (630.92 KB)
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2018-09-07
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Springer Science+Business Media, LLC
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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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Distributed feedback quantum cascade lasers, Large-signal modulation, Multiharmonic generation, Optical frequency comb, Radiofrequency photonics
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Optical and quantum electronics, 50(351), Sept. 2018, 8 pp.
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