Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Continuous-Wave Terahertz Radiation

Regis, Michele De; Consolino, Luigi; Bartalini, S.; Natale, P. De

doi:10.3390/app8122374

Cited by 22 publications

(21 citation statements)

References 55 publications

(67 reference statements)

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“…It is worth noting that both the stabilization signals are sent to the QCL-comb as electrical signals, acting on its voltage/current, over two well separated frequency ranges: the RF range for the 17.45 GHz signal that locks the mode spacing, and the DC/low frequency range for the PL-loop, with a 400 kHz bandwidth. Actually, this configuration only requires a RF source for mode spacing stabilization, and one single-frequency metrological-grade THz signal 23,26,27 , falling into the QCL-comb emission spectrum, for offset frequency stabilization. To this purpose, in this work, we have used one mode of the OR-comb, while exploiting its complete emission for an exhaustive characterization of the QCL-comb.…”

Section: Resultsmentioning

confidence: 99%

Fully phase-stabilized quantum cascade laser frequency comb

et al. 2019

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Miniaturized frequency comb sources across hard-to-access spectral regions, i.e. mid- and far-infrared, have long been sought. Four-wave-mixing based Quantum Cascade Laser combs (QCL-combs) are ideal candidates, in this respect, due to the unique possibility to tailor their spectral emission by proper nanoscale design of the quantum wells. We demonstrate full-phase-stabilization of a QCL-comb against the primary frequency standard, proving independent and simultaneous control of the two comb degrees of freedom (modes spacing and frequency offset) at a metrological level. Each emitted mode exhibits a sub-Hz relative frequency stability, while a correlation analysis on the modal phases confirms the high degree of coherence in the device emission, over different power-cycles and over different days. The achievement of fully controlled, phase-stabilized QCL-comb emitters proves that this technology is mature for metrological-grade uses, as well as for an increasing number of scientific and technological applications.

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Section: Resultsmentioning

confidence: 99%

Fully phase-stabilized quantum cascade laser frequency comb

et al. 2019

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“…The two sidebands indicate a phase-lock electronic bandwidth of 400 kHz the PL-loop, with a 400 kHz bandwidth. Actually, this configuration only requires a RF source for mode spacing stabilization, and one single-frequency metrological-grade THz signal 23,26,27 , falling into the QCL-comb emission spectrum, for offset frequency stabilization. To this purpose, in this work, we have used one mode of the OR-comb, while exploiting its complete emission for an exhaustive characterization of the QCLcomb.…”

Section: Resultsmentioning

confidence: 99%

Fully Phase Stabilized Quantum Cascade Laser Frequency Comb

Bartalini

Consolino

Nafa

et al. 2019

2019 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Miniaturized frequency comb sources across hard-to-access spectral regions, i.e. mid-and far-infrared, have long been sought. Four-wave-mixing based Quantum Cascade Laser combs (QCL-combs) are ideal candidates, in this respect, due to the unique possibility to tailor their spectral emission by proper nanoscale design of the quantum wells. We demonstrate fullphase-stabilization of a QCL-comb against the primary frequency standard, proving independent and simultaneous control of the two comb degrees of freedom (modes spacing and frequency offset) at a metrological level. Each emitted mode exhibits a sub-Hz relative frequency stability, while a correlation analysis on the modal phases confirms the high degree of coherence in the device emission, over different power-cycles and over different days. The achievement of fully controlled, phase-stabilized QCL-comb emitters proves that this technology is mature for metrological-grade uses, as well as for an increasing number of scientific and technological applications.

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“…However, the resonant cavity used to increase the pump intensity up to 500 W unavoidably implies a reduction in the tuning range, which is limited to 200 GHz. In order to overcome such limitations, a different strategy to maintain the phase matching condition stands in the Cherenkov emission scheme [42][43][44]. Indeed, even having a uniformly distributed nonlinear susceptibility, for a specific direction defined by the so-called Cherenkov angle…”

Section: Waveguided Cherenkov Nonlinear Generationmentioning

confidence: 99%

Room-Temperature Continuous-Wave Frequency-Referenced Spectrometer up to 7.5 THz

et al. 2018

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The lack of coherent room-temperature sources in the whole terahertz spectral window (0.3-10 THz) has significantly hampered the growth of scientific and technological applications in this range. Among them, highprecision frequency measurements of molecular transitions play a central role but remain an open challenge. Here, room-temperature generation and detection of continuous-wave, broadly tunable, narrow-linewidth THz radiation are presented, and their application to high-resolution spectroscopy in the broad 1-7.5 THz spectral range is demonstrated. This result has been achieved by implementing a Cherenkov phase-matching scheme into a channel waveguide in a nonlinear crystal. This simple approach, entirely based on robust telecom technology, unprecedently merges in a single source an ultra-broad continuous wave spectral coverage and a state-of-the-art accuracy (∼ 10 −9 ) in molecular transition center determination.

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Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Continuous-Wave Terahertz Radiation

Cited by 22 publications

References 55 publications

Fully phase-stabilized quantum cascade laser frequency comb

Fully phase-stabilized quantum cascade laser frequency comb

Fully Phase Stabilized Quantum Cascade Laser Frequency Comb

Room-Temperature Continuous-Wave Frequency-Referenced Spectrometer up to 7.5 THz

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