The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Jérôme Faist - One of the best experts on this subject based on the ideXlab platform.
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on chip dual comb based on quantum cascade Laser Frequency combs
Applied Physics Letters, 2015Co-Authors: Gustavo Villares, Andreas Hugi, Dmitry Kazakov, Johanna Wolf, Martin J Suess, Mattias Beck, Jérôme FaistAbstract:Dual-comb spectroscopy is emerging as an appealing application of mid-infrared Frequency combs for high-resolution molecular spectroscopy, as it leverages on the unique coherence properties of Frequency combs. Here, we present an on-chip dual-comb source based on mid-infrared quantum cascade Laser Frequency combs. Control of the combs repetition and offset frequencies is obtained by integrating micro-heaters next to each Laser. We show that a full control of the dual-comb system is possible, by measuring a multi-heterodyne beating corresponding to an optical bandwidth of 32 cm−1 centered at 1330 cm−1 (7.52 μm), demonstrating that this device represents a critical step towards compact dual-comb systems.
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Intrinsic linewidth of quantum cascade Laser Frequency combs
Optica, 2015Co-Authors: Francesco Cappelli, Gustavo Villares, Sabine Riedi, Jérôme FaistAbstract:The Frequency noise power spectral density of a free-running quantum cascade Laser Frequency comb is investigated. A plateau is observed at high frequencies, attributed to the quantum noise limit set by the Schawlow-Townes formula for the total Laser power on all comb lines. In our experiment, a linewidth of 292 Hz is measured for a total power of 25 mW. This result proves that the four-wave mixing process, responsible for the comb operation, effectively correlates the quantum noise of the individual comb lines.
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Dual-comb spectroscopy based on quantum cascade Laser Frequency combs
CLEO: 2015, 2015Co-Authors: Gustavo Villares, Francesco Cappelli, Andreas Hugi, Stéphane Blaser, Jérôme FaistAbstract:Mid-infrared dual-comb spectroscopy by means of quantum cascade Laser Frequency combs is demonstrated. Broadband high resolution molecular spectroscopy is performed, showing the potential of quantum cascade Laser combs as a compact, all solid-state, chemical sensor.
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dual comb spectroscopy based on quantum cascade Laser Frequency combs
Nature Communications, 2014Co-Authors: Gustavo Villares, Andreas Hugi, Stéphane Blaser, Jérôme FaistAbstract:Dual-comb spectroscopy performed in the mid-infrared-where molecules have their strongest rotovibrational absorption lines-offers the promise of high spectral resolution broadband spectroscopy with very short acquisition times (μs) and no moving parts. Recently, we demonstrated Frequency comb operation of a quantum-cascade-Laser. We now use that device in a compact, dual-comb spectrometer. The noise properties of the heterodyne beat are close to the shot noise limit. Broadband (15 cm(-1)) high-resolution (80 MHz) absorption spectroscopy of both a GaAs etalon and water vapour is demonstrated, showing the potential of quantum-cascade-Laser Frequency combs as the basis for a compact, all solid-state, broadband chemical sensor.
Gustavo Villares - One of the best experts on this subject based on the ideXlab platform.
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on chip dual comb based on quantum cascade Laser Frequency combs
Applied Physics Letters, 2015Co-Authors: Gustavo Villares, Andreas Hugi, Dmitry Kazakov, Johanna Wolf, Martin J Suess, Mattias Beck, Jérôme FaistAbstract:Dual-comb spectroscopy is emerging as an appealing application of mid-infrared Frequency combs for high-resolution molecular spectroscopy, as it leverages on the unique coherence properties of Frequency combs. Here, we present an on-chip dual-comb source based on mid-infrared quantum cascade Laser Frequency combs. Control of the combs repetition and offset frequencies is obtained by integrating micro-heaters next to each Laser. We show that a full control of the dual-comb system is possible, by measuring a multi-heterodyne beating corresponding to an optical bandwidth of 32 cm−1 centered at 1330 cm−1 (7.52 μm), demonstrating that this device represents a critical step towards compact dual-comb systems.
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Intrinsic linewidth of quantum cascade Laser Frequency combs
Optica, 2015Co-Authors: Francesco Cappelli, Gustavo Villares, Sabine Riedi, Jérôme FaistAbstract:The Frequency noise power spectral density of a free-running quantum cascade Laser Frequency comb is investigated. A plateau is observed at high frequencies, attributed to the quantum noise limit set by the Schawlow-Townes formula for the total Laser power on all comb lines. In our experiment, a linewidth of 292 Hz is measured for a total power of 25 mW. This result proves that the four-wave mixing process, responsible for the comb operation, effectively correlates the quantum noise of the individual comb lines.
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Dual-comb spectroscopy based on quantum cascade Laser Frequency combs
CLEO: 2015, 2015Co-Authors: Gustavo Villares, Francesco Cappelli, Andreas Hugi, Stéphane Blaser, Jérôme FaistAbstract:Mid-infrared dual-comb spectroscopy by means of quantum cascade Laser Frequency combs is demonstrated. Broadband high resolution molecular spectroscopy is performed, showing the potential of quantum cascade Laser combs as a compact, all solid-state, chemical sensor.
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dual comb spectroscopy based on quantum cascade Laser Frequency combs
Nature Communications, 2014Co-Authors: Gustavo Villares, Andreas Hugi, Stéphane Blaser, Jérôme FaistAbstract:Dual-comb spectroscopy performed in the mid-infrared-where molecules have their strongest rotovibrational absorption lines-offers the promise of high spectral resolution broadband spectroscopy with very short acquisition times (μs) and no moving parts. Recently, we demonstrated Frequency comb operation of a quantum-cascade-Laser. We now use that device in a compact, dual-comb spectrometer. The noise properties of the heterodyne beat are close to the shot noise limit. Broadband (15 cm(-1)) high-resolution (80 MHz) absorption spectroscopy of both a GaAs etalon and water vapour is demonstrated, showing the potential of quantum-cascade-Laser Frequency combs as the basis for a compact, all solid-state, broadband chemical sensor.
Francesco Cappelli - One of the best experts on this subject based on the ideXlab platform.
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retrieval of phase relation and emission profile of quantum cascade Laser Frequency combs
Nature Photonics, 2019Co-Authors: Francesco Cappelli, Luigi Consolino, Giulio Campo, Iacopo Galli, D Mazzotti, Annamaria Campa, Mario Siciliani De Cumis, Pablo Cancio Pastor, R Eramo, Markus RoschAbstract:Recently, the field of optical Frequency combs experienced a major development of new sources. They are generally much smaller in size (on the scale of millimetres) and can extend Frequency comb emission to other spectral regions, in particular towards the mid- and far-infrared regions. Unlike classical pulsed Frequency combs, their mode-locking mechanism relies on four-wave-mixing nonlinear processes, yielding a non-trivial phase relation among the modes and an uncommon emission time profile. Here, by combining dual-comb multi-heterodyne detection with Fourier-transform analysis, we show how to simultaneously acquire and monitor over a wide range of timescales the phase pattern of a generic (unknown) Frequency comb. The technique is applied to characterize both a mid-infrared and a terahertz quantum cascade Laser Frequency comb, conclusively proving the high degree of coherence and the remarkable long-term stability of these sources. Moreover, the technique allows also the reconstruction of the electric field, intensity profile and instantaneous Frequency of the emission. The combined technique of dual-comb multi-heterodyne detection and Fourier-transform analysis allows simultaneous acquisition and monitoring of the phase pattern of a generic Frequency comb demonstrating the high degree of coherence of the emission of two quantum cascade Laser Frequency combs.
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Intrinsic linewidth of quantum cascade Laser Frequency combs
Optica, 2015Co-Authors: Francesco Cappelli, Gustavo Villares, Sabine Riedi, Jérôme FaistAbstract:The Frequency noise power spectral density of a free-running quantum cascade Laser Frequency comb is investigated. A plateau is observed at high frequencies, attributed to the quantum noise limit set by the Schawlow-Townes formula for the total Laser power on all comb lines. In our experiment, a linewidth of 292 Hz is measured for a total power of 25 mW. This result proves that the four-wave mixing process, responsible for the comb operation, effectively correlates the quantum noise of the individual comb lines.
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Dual-comb spectroscopy based on quantum cascade Laser Frequency combs
CLEO: 2015, 2015Co-Authors: Gustavo Villares, Francesco Cappelli, Andreas Hugi, Stéphane Blaser, Jérôme FaistAbstract:Mid-infrared dual-comb spectroscopy by means of quantum cascade Laser Frequency combs is demonstrated. Broadband high resolution molecular spectroscopy is performed, showing the potential of quantum cascade Laser combs as a compact, all solid-state, chemical sensor.
Min Xiao - One of the best experts on this subject based on the ideXlab platform.
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Coherent transient amplification in inhomogeneously broadened rubidium atoms by diode-Laser Frequency switching.
Optics letters, 1996Co-Authors: W. H. Burkett, Min XiaoAbstract:We report observation of coherent transient amplification that is due to free-induction decay and optical nutation in inhomogeneously broadened rubidium atoms by a sudden switch of diode-Laser Frequency. An amplification coefficient of 2.2 x 10(-2) cm(-1) is observed when the diode-Laser Frequency, initially tuned to the blue side of the Doppler-broadened absorption profile, is switched to be out of resonance by application of a step-function pulsed injection current. The transition from free-induction decay to optical nutation is observed and discussed.
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Transient Inversionless Amplification in Rubidium Atoms by Laser Frequency-Switching
Coherence and Quantum Optics VII, 1996Co-Authors: Yong-qing Li, Min XiaoAbstract:There has been a lot of interest in lasing and amplification without population inversion in multi-level atomic systems in transient region1 and in coherently driven two-level atoms in steady-state region.2 In this paper, we report a new technique to observe transient amplification without population inversion due to free-induction decay and optical nutation3 by current-switching of the diode-Laser Frequency in inhomogeneously-broadened two-level Rb atoms.
Andreas Hugi - One of the best experts on this subject based on the ideXlab platform.
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on chip dual comb based on quantum cascade Laser Frequency combs
Applied Physics Letters, 2015Co-Authors: Gustavo Villares, Andreas Hugi, Dmitry Kazakov, Johanna Wolf, Martin J Suess, Mattias Beck, Jérôme FaistAbstract:Dual-comb spectroscopy is emerging as an appealing application of mid-infrared Frequency combs for high-resolution molecular spectroscopy, as it leverages on the unique coherence properties of Frequency combs. Here, we present an on-chip dual-comb source based on mid-infrared quantum cascade Laser Frequency combs. Control of the combs repetition and offset frequencies is obtained by integrating micro-heaters next to each Laser. We show that a full control of the dual-comb system is possible, by measuring a multi-heterodyne beating corresponding to an optical bandwidth of 32 cm−1 centered at 1330 cm−1 (7.52 μm), demonstrating that this device represents a critical step towards compact dual-comb systems.
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Dual-comb spectroscopy based on quantum cascade Laser Frequency combs
CLEO: 2015, 2015Co-Authors: Gustavo Villares, Francesco Cappelli, Andreas Hugi, Stéphane Blaser, Jérôme FaistAbstract:Mid-infrared dual-comb spectroscopy by means of quantum cascade Laser Frequency combs is demonstrated. Broadband high resolution molecular spectroscopy is performed, showing the potential of quantum cascade Laser combs as a compact, all solid-state, chemical sensor.
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dual comb spectroscopy based on quantum cascade Laser Frequency combs
Nature Communications, 2014Co-Authors: Gustavo Villares, Andreas Hugi, Stéphane Blaser, Jérôme FaistAbstract:Dual-comb spectroscopy performed in the mid-infrared-where molecules have their strongest rotovibrational absorption lines-offers the promise of high spectral resolution broadband spectroscopy with very short acquisition times (μs) and no moving parts. Recently, we demonstrated Frequency comb operation of a quantum-cascade-Laser. We now use that device in a compact, dual-comb spectrometer. The noise properties of the heterodyne beat are close to the shot noise limit. Broadband (15 cm(-1)) high-resolution (80 MHz) absorption spectroscopy of both a GaAs etalon and water vapour is demonstrated, showing the potential of quantum-cascade-Laser Frequency combs as the basis for a compact, all solid-state, broadband chemical sensor.
