Journal
PHYSICAL REVIEW APPLIED
Volume 12, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.12.044068
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Funding
- Hundred-Talent Program of Chinese Academy of Sciences
- National Natural Science Foundation of China [61875220, 61575214, 61404150, 61405233, 61704181]
- Fundamental Frontier Scientific Research Program of Chinese Academy of Sciences [ZDBS-LY-JSC009]
- Major National Development Project of Scientific Instrument and Equipment [2017YFF0106302]
- ShanghaiMunicipal Commission of Science and Technology [17YF1430000]
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High-power and broadband dual-comb sources in the terahertz frequency regime are much in demand for fast and high-resolution spectroscopies. The terahertz quantum cascade laser (QCL) is a powerful radiation source in the frequency range between 1 and 5 THz, which is an ideal candidate for frequency-comb and dual-comb generations in this frequency regime. In this work, we report on broadband on-chip dual-comb sources based on terahertz QCLs emitting at approximately 4.2 THz with a single plasmon waveguide configuration. Due to the fast intersubband transitions in QCLs, the dual-comb lines can be detected by employing the laser self-detection scheme. A finite-element analysis shows that a weak optical coupling between the two laser combs is sufficient for generating dual-comb lines via the nonlinear multiheterodyne frequency beatings. The noise-equivalent power of the QCL detector is also evaluated for different optical powers; furthermore, a microwave double injection is employed to stabilize the comb frequency and broaden the optical comb bandwidth. We find that even with weak radio-frequency powers, the optical comb bandwidth can be significantly broadened from 86 to 166 GHz. The double injection also allows us to investigate the carrier offset noise of QCL combs.
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