The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Dmitry Kazakov - One of the best experts on this subject based on the ideXlab platform.
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Shaping Harmonic Frequency Combs in Ring Injection Lasers by Defect Engineering
Conference on Lasers and Electro-Optics, 2020Co-Authors: Dmitry Kazakov, Marco Piccardo, Yongrui Wang, Benedikt Schwarz, Maximilian Beiser, Nikola Opacak, Alexey Belyanin, Federico CapassoAbstract:Quantum cascade lasers are known to spontaneously skip modes and generate widely-spaced Harmonic Frequency combs. We show that engineering defects in a ring waveguide allows for deterministic control of the comb intermode spacing.
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widely tunable Harmonic Frequency comb in a quantum cascade laser
Applied Physics Letters, 2018Co-Authors: Marco Piccardo, Paul Chevalier, Sajant Anand, Yongrui Wang, Dmitry Kazakov, Enrique A Mejia, Feng XieAbstract:Self-starting Harmonic Frequency combs in quantum cascade lasers exhibit skipping of several tens of longitudinal modes of the cavity, producing widely spaced Frequency combs which may be used for a number of applications, such as the generation of high-spectral-purity microwave and terahertz tones. Under pure electrical injection, the spacing of such combs is fixed by fundamental laser parameters and can hardly be controlled. Here, we demonstrate that Harmonic Frequency combs in quantum cascade lasers can be induced by optical injection of an external seed provided by a tunable source. This scheme enables wide tunability of the Harmonic comb spacing, allowing the skipping between 44 and 171 longitudinal modes in a single device.Self-starting Harmonic Frequency combs in quantum cascade lasers exhibit skipping of several tens of longitudinal modes of the cavity, producing widely spaced Frequency combs which may be used for a number of applications, such as the generation of high-spectral-purity microwave and terahertz tones. Under pure electrical injection, the spacing of such combs is fixed by fundamental laser parameters and can hardly be controlled. Here, we demonstrate that Harmonic Frequency combs in quantum cascade lasers can be induced by optical injection of an external seed provided by a tunable source. This scheme enables wide tunability of the Harmonic comb spacing, allowing the skipping between 44 and 171 longitudinal modes in a single device.
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Shaping Harmonic Frequency combs in quantum cascade lasers
Conference on Lasers and Electro-Optics, 2018Co-Authors: Marco Piccardo, Paul Chevalier, Sajant Anand, Yongrui Wang, Dmitry Kazakov, Enrique A Mejia, Benedikt Schwarz, Noah A. Rubin, Michele Tamagnone, Feng XieAbstract:Controlling the spacing of self-starting Harmonic Frequency combs in QCLs by design of fundamental laser parameters is arduous. New ways to shape such combs by means of original electrical, optical and radioFrequency techniques are presented.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
Nature Photonics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs 1,2 establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications 3 . Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis 4,5 and for the generation of terahertz tones of high spectral purity in future wireless communication networks 6,7 . Here, we demonstrate self-starting Harmonic Frequency comb generation with a terahertz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of population inversion in the laser 8,9 . Using multiheterodyne self-detection, the mode spacing of the Harmonic comb is shown to be uniform to within 5 × 10−12 parts of the central Frequency. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs 10–13 . Self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser is demonstrated. The mode spacing uniformity is verified to within 5 × 10−12 parts of the central Frequency. The findings extend the range of applications of quantum cascade laser Frequency combs.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
arXiv: Optics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications. Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis and for generation of THz tones of high spectral purity in the future wireless communication networks. We demonstrate for the first time self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of the population inversion in the laser. The mode spacing of the Harmonic comb is shown to be uniform to within $5\times 10^{-12}$ parts of the central Frequency using multiheterodyne self-detection. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs.
Jean-jacques Sinou - One of the best experts on this subject based on the ideXlab platform.
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Detection of cracks in rotor based on the 2× and 3× super-Harmonic Frequency components and the crack–unbalance interactions
Communications in Nonlinear Science and Numerical Simulation, 2008Co-Authors: Jean-jacques SinouAbstract:The purpose of this paper is to investigate the use of the 2* and 3* super-Harmonic Frequency components for detecting the presence of a single transverse breathing crack in a non-linear rotor system. This procedure is based on the detection of the super-Harmonic Frequency components of the non-linear dynamical behaviour at the associated sub-critical resonant peaks. The non-linear behaviour of the rotor system with a breathing crack is briefly analysed numerically: it will be illustrated that the effects of the crack size and location induce the variation of non-linear responses and the emerging of new resonance - antiresonance peaks of the cracked rotor at second, third and fourth Harmonic Frequency components. Then, the influence of the crack-unbalance interactions and more particularly the relative orientation between the front crack and the unbalance are also undertaken with considerations of various crack depths, and unbalance magnitudes. It is demonstrated that for a given crack depth, the unbalance does not only affect the vibration amplitude of the 1X amplitudes, but also the 1/2 and 1/3 sub-critical resonant peaks. Finally, it is illustrated that the emerging of super-Harmonic Frequency components provides useful information on the presence of cracks and may be used on an on-line crack monitoring rotor system. Using this methodology, the detection of small levels of damage may be easily undertaken.
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Detection of cracks in rotor based on the 2X and 3X super-Harmonic Frequency components and the crack-unbalance interactions
Communications in Nonlinear Science and Numerical Simulation, 2008Co-Authors: Jean-jacques SinouAbstract:The purpose of this paper is to investigate the use of the 2* and 3* super-Harmonic Frequency components for detecting the presence of a single transverse breathing crack in a non-linear rotor system. This procedure is based on the detection of the super-Harmonic Frequency components of the non-linear dynamical behaviour at the associated sub-critical resonant peaks. The non-linear behaviour of the rotor system with a breathing crack is briefly analysed numerically: it will be illustrated that the effects of the crack size and location induce the variation of non-linear responses and the emerging of new resonance - antiresonance peaks of the cracked rotor at second, third and fourth Harmonic Frequency components. Then, the influence of the crack-unbalance interactions and more particularly the relative orientation between the front crack and the unbalance are also undertaken with considerations of various crack depths, and unbalance magnitudes. It is demonstrated that for a given crack depth, the unbalance does not only affect the vibration amplitude of the 1X amplitudes, but also the 1/2 and 1/3 sub-critical resonant peaks. Finally, it is illustrated that the emerging of super-Harmonic Frequency components provides useful information on the presence of cracks and may be used on an on-line crack monitoring rotor system. Using this methodology, the detection of small levels of damage may be easily undertaken.
Feng Xie - One of the best experts on this subject based on the ideXlab platform.
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widely tunable Harmonic Frequency comb in a quantum cascade laser
Applied Physics Letters, 2018Co-Authors: Marco Piccardo, Paul Chevalier, Sajant Anand, Yongrui Wang, Dmitry Kazakov, Enrique A Mejia, Feng XieAbstract:Self-starting Harmonic Frequency combs in quantum cascade lasers exhibit skipping of several tens of longitudinal modes of the cavity, producing widely spaced Frequency combs which may be used for a number of applications, such as the generation of high-spectral-purity microwave and terahertz tones. Under pure electrical injection, the spacing of such combs is fixed by fundamental laser parameters and can hardly be controlled. Here, we demonstrate that Harmonic Frequency combs in quantum cascade lasers can be induced by optical injection of an external seed provided by a tunable source. This scheme enables wide tunability of the Harmonic comb spacing, allowing the skipping between 44 and 171 longitudinal modes in a single device.Self-starting Harmonic Frequency combs in quantum cascade lasers exhibit skipping of several tens of longitudinal modes of the cavity, producing widely spaced Frequency combs which may be used for a number of applications, such as the generation of high-spectral-purity microwave and terahertz tones. Under pure electrical injection, the spacing of such combs is fixed by fundamental laser parameters and can hardly be controlled. Here, we demonstrate that Harmonic Frequency combs in quantum cascade lasers can be induced by optical injection of an external seed provided by a tunable source. This scheme enables wide tunability of the Harmonic comb spacing, allowing the skipping between 44 and 171 longitudinal modes in a single device.
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Shaping Harmonic Frequency combs in quantum cascade lasers
Conference on Lasers and Electro-Optics, 2018Co-Authors: Marco Piccardo, Paul Chevalier, Sajant Anand, Yongrui Wang, Dmitry Kazakov, Enrique A Mejia, Benedikt Schwarz, Noah A. Rubin, Michele Tamagnone, Feng XieAbstract:Controlling the spacing of self-starting Harmonic Frequency combs in QCLs by design of fundamental laser parameters is arduous. New ways to shape such combs by means of original electrical, optical and radioFrequency techniques are presented.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
Nature Photonics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs 1,2 establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications 3 . Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis 4,5 and for the generation of terahertz tones of high spectral purity in future wireless communication networks 6,7 . Here, we demonstrate self-starting Harmonic Frequency comb generation with a terahertz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of population inversion in the laser 8,9 . Using multiheterodyne self-detection, the mode spacing of the Harmonic comb is shown to be uniform to within 5 × 10−12 parts of the central Frequency. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs 10–13 . Self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser is demonstrated. The mode spacing uniformity is verified to within 5 × 10−12 parts of the central Frequency. The findings extend the range of applications of quantum cascade laser Frequency combs.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
arXiv: Optics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications. Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis and for generation of THz tones of high spectral purity in the future wireless communication networks. We demonstrate for the first time self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of the population inversion in the laser. The mode spacing of the Harmonic comb is shown to be uniform to within $5\times 10^{-12}$ parts of the central Frequency using multiheterodyne self-detection. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs.
Marco Piccardo - One of the best experts on this subject based on the ideXlab platform.
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Shaping Harmonic Frequency Combs in Ring Injection Lasers by Defect Engineering
Conference on Lasers and Electro-Optics, 2020Co-Authors: Dmitry Kazakov, Marco Piccardo, Yongrui Wang, Benedikt Schwarz, Maximilian Beiser, Nikola Opacak, Alexey Belyanin, Federico CapassoAbstract:Quantum cascade lasers are known to spontaneously skip modes and generate widely-spaced Harmonic Frequency combs. We show that engineering defects in a ring waveguide allows for deterministic control of the comb intermode spacing.
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widely tunable Harmonic Frequency comb in a quantum cascade laser
Applied Physics Letters, 2018Co-Authors: Marco Piccardo, Paul Chevalier, Sajant Anand, Yongrui Wang, Dmitry Kazakov, Enrique A Mejia, Feng XieAbstract:Self-starting Harmonic Frequency combs in quantum cascade lasers exhibit skipping of several tens of longitudinal modes of the cavity, producing widely spaced Frequency combs which may be used for a number of applications, such as the generation of high-spectral-purity microwave and terahertz tones. Under pure electrical injection, the spacing of such combs is fixed by fundamental laser parameters and can hardly be controlled. Here, we demonstrate that Harmonic Frequency combs in quantum cascade lasers can be induced by optical injection of an external seed provided by a tunable source. This scheme enables wide tunability of the Harmonic comb spacing, allowing the skipping between 44 and 171 longitudinal modes in a single device.Self-starting Harmonic Frequency combs in quantum cascade lasers exhibit skipping of several tens of longitudinal modes of the cavity, producing widely spaced Frequency combs which may be used for a number of applications, such as the generation of high-spectral-purity microwave and terahertz tones. Under pure electrical injection, the spacing of such combs is fixed by fundamental laser parameters and can hardly be controlled. Here, we demonstrate that Harmonic Frequency combs in quantum cascade lasers can be induced by optical injection of an external seed provided by a tunable source. This scheme enables wide tunability of the Harmonic comb spacing, allowing the skipping between 44 and 171 longitudinal modes in a single device.
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Shaping Harmonic Frequency combs in quantum cascade lasers
Conference on Lasers and Electro-Optics, 2018Co-Authors: Marco Piccardo, Paul Chevalier, Sajant Anand, Yongrui Wang, Dmitry Kazakov, Enrique A Mejia, Benedikt Schwarz, Noah A. Rubin, Michele Tamagnone, Feng XieAbstract:Controlling the spacing of self-starting Harmonic Frequency combs in QCLs by design of fundamental laser parameters is arduous. New ways to shape such combs by means of original electrical, optical and radioFrequency techniques are presented.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
Nature Photonics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs 1,2 establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications 3 . Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis 4,5 and for the generation of terahertz tones of high spectral purity in future wireless communication networks 6,7 . Here, we demonstrate self-starting Harmonic Frequency comb generation with a terahertz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of population inversion in the laser 8,9 . Using multiheterodyne self-detection, the mode spacing of the Harmonic comb is shown to be uniform to within 5 × 10−12 parts of the central Frequency. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs 10–13 . Self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser is demonstrated. The mode spacing uniformity is verified to within 5 × 10−12 parts of the central Frequency. The findings extend the range of applications of quantum cascade laser Frequency combs.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
arXiv: Optics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications. Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis and for generation of THz tones of high spectral purity in the future wireless communication networks. We demonstrate for the first time self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of the population inversion in the laser. The mode spacing of the Harmonic comb is shown to be uniform to within $5\times 10^{-12}$ parts of the central Frequency using multiheterodyne self-detection. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs.
Alexey Belyanin - One of the best experts on this subject based on the ideXlab platform.
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Generation of Harmonic Frequency combs in quantum cascade lasers with two lower laser states
Novel In-Plane Semiconductor Lasers XX, 2021Co-Authors: Yongrui Wang, Andres Forrer, Giacomo Scalari, Alexey BelyaninAbstract:New experiments with THz QCLs reveal the Harmonic Frequency comb regime, in which isolated modes are separated by several free spectral ranges and the optical spectrum does not have a reflection symmetry. Here we study the mechanism of the Harmonic Frequency combs. Our calculations show that the Harmonic comb is favored if the QCL contains two lower laser states, with different but comparable strength of the optical transitions. The asymmetry between the two optical transitions can be linked to a linewidth enhancement factor. Our work can be extended to mid-IR QCLs with an asymmetric gain spectrum.
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Shaping Harmonic Frequency Combs in Ring Injection Lasers by Defect Engineering
Conference on Lasers and Electro-Optics, 2020Co-Authors: Dmitry Kazakov, Marco Piccardo, Yongrui Wang, Benedikt Schwarz, Maximilian Beiser, Nikola Opacak, Alexey Belyanin, Federico CapassoAbstract:Quantum cascade lasers are known to spontaneously skip modes and generate widely-spaced Harmonic Frequency combs. We show that engineering defects in a ring waveguide allows for deterministic control of the comb intermode spacing.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
Nature Photonics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs 1,2 establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications 3 . Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis 4,5 and for the generation of terahertz tones of high spectral purity in future wireless communication networks 6,7 . Here, we demonstrate self-starting Harmonic Frequency comb generation with a terahertz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of population inversion in the laser 8,9 . Using multiheterodyne self-detection, the mode spacing of the Harmonic comb is shown to be uniform to within 5 × 10−12 parts of the central Frequency. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs 10–13 . Self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser is demonstrated. The mode spacing uniformity is verified to within 5 × 10−12 parts of the central Frequency. The findings extend the range of applications of quantum cascade laser Frequency combs.
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self starting Harmonic Frequency comb generation in a quantum cascade laser
arXiv: Optics, 2017Co-Authors: Marco Piccardo, Paul Chevalier, Yongrui Wang, Dmitry Kazakov, Feng Xie, Tobias S Mansuripur, Chungen Zah, Kevin Lascola, Alexey BelyaninAbstract:Optical Frequency combs establish a rigid phase-coherent link between microwave and optical domains and are emerging as high-precision tools in an increasing number of applications. Frequency combs with large intermodal spacing are employed in the field of microwave photonics for radioFrequency arbitrary waveform synthesis and for generation of THz tones of high spectral purity in the future wireless communication networks. We demonstrate for the first time self-starting Harmonic Frequency comb generation with a THz repetition rate in a quantum cascade laser. The large intermodal spacing caused by the suppression of tens of adjacent cavity modes originates from a parametric contribution to the gain due to temporal modulations of the population inversion in the laser. The mode spacing of the Harmonic comb is shown to be uniform to within $5\times 10^{-12}$ parts of the central Frequency using multiheterodyne self-detection. This new Harmonic comb state extends the range of applications of quantum cascade laser Frequency combs.
