The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Halina Rubinsztein-dunlop - One of the best experts on this subject based on the ideXlab platform.
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Seeded parametric Four-Wave Mixing for sensitive detection of atoms and molecules
Technical Digest. Summaries of Papers Presented at the International Quantum Electronics Conference. Conference Edition. 1998 Technical Digest Series , 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Halina Rubinsztein-dunlop, Alan E. W. KnightAbstract:A simple variant of parametric Four-Wave Mixing (PFWM), which we call seeded parametric Four-Wave Mixing (SPFWM), has been developed. This is a near-resonant nondegenerate Four-Wave Mixing technique that offers distinct advantages over similar techniques as it only requires a single beam and is automatically phase matched. Furthermore, the signal is generated at a different Wavelength to, but travels collinear with, the pump beam enabling efficient signal retrieval.
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Sensitive detection of nitric oxide using seeded parametric Four-Wave Mixing
Journal of Chemical Physics, 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:A sensitive near-resonant Four-Wave Mixing technique based on two-photon parametric Four-Wave Mixing has been developed. Seeded parametric Four-Wave Mixing requires only a single laser as an additional phase matched “seeder” field is generated via parametric Four-Wave Mixing of the pump beam in a high gain cell. The seeder field travels collinearly with the pump beam providing efficient nondegenerate Four-Wave Mixing in a second medium. This simple arrangement facilitates the detection of complex molecular spectra by simply scanning the pump laser. Seeded parametric Four-Wave Mixing is demonstrated in both a low pressure cell and an air/acetylene flame with detection of the two-photon C 2Π(v′=0)←X 2Π(v″=0) spectrum of nitric oxide. From the cell data a detection limit of 1012 molecules/cm3 is established. A theoretical model of seeded parametric Four-Wave Mixing is developed from existing parametric Four-Wave Mixing theory. The addition of the seeder field significantly modifies the parametric Four-Wave m...
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Sensitive detection of sodium in a flame using parametric Four-Wave Mixing and seeded parametric Four-Wave Mixing
Physical Review A, 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:Two-photon resonant parametric Four-Wave Mixing and a newly developed variant called seeded parametric Four-Wave Mixing are used to detect trace quantities of sodium in a flame. Both techniques are simple, requiring only a single laser to generate a signal beam at a different Wavelength which propagates collinearly with the pump beam, allowing efficient signal recovery. A comparison of the two techniques reveals that seeded parametric Four-Wave Mixing is more than two orders of magnitude more sensitive than parametric Four-Wave Mixing, with an estimated detection sensitivity of 5 x 10(9) atoms/cm(3). Seeded parametric Four-Wave Mixing is achieved by cascading two parametric Four-Wave Mixing media such that one of the parametric fields generated in the first high-density medium is then used to seed the same Four-Wave Mixing process in a second medium in order to increase the Four-Wave Mixing gain. The behavior of this seeded parametric Four-Wave Mixing is described using semiclassical perturbation theory. A simplified small-signal theory is found to model most of the data satisfactorily. However, an anomalous saturationlike behavior is observed in the large signal regime. The full perturbation treatment, which includes the competition between two different Four-Wave Mixing processes coupled via the signal field, accounts for this apparently anomalous behavior.
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Infrared seeded parametric Four-Wave Mixing for sensitive detection of molecules
Physical Review Letters, 1997Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:We have developed a sensitive resonant Four-Wave Mixing technique based on two-photon parametric Four-Wave Mixing with the addition of a phase matched ''seeder'' field. Generation of the seeder field via the same Four-Wave Mixing process in a high pressure cell enables automatic phase matching to be achieved in a low pressure sample cell. This arrangement facilitates sensitive detection of complex molecular spectra by simply tuning the pump laser. We demonstrate the technique with the detection of nitric oxide down to concentrations more than 4 orders of magnitude below the capability of parametric Four-Wave Mixing alone, with an estimated detection threshold of 10(12) molecules/cm(3).
Mark J. Fernée - One of the best experts on this subject based on the ideXlab platform.
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Seeded parametric Four-Wave Mixing for sensitive detection of atoms and molecules
Technical Digest. Summaries of Papers Presented at the International Quantum Electronics Conference. Conference Edition. 1998 Technical Digest Series , 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Halina Rubinsztein-dunlop, Alan E. W. KnightAbstract:A simple variant of parametric Four-Wave Mixing (PFWM), which we call seeded parametric Four-Wave Mixing (SPFWM), has been developed. This is a near-resonant nondegenerate Four-Wave Mixing technique that offers distinct advantages over similar techniques as it only requires a single beam and is automatically phase matched. Furthermore, the signal is generated at a different Wavelength to, but travels collinear with, the pump beam enabling efficient signal retrieval.
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Sensitive detection of nitric oxide using seeded parametric Four-Wave Mixing
Journal of Chemical Physics, 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:A sensitive near-resonant Four-Wave Mixing technique based on two-photon parametric Four-Wave Mixing has been developed. Seeded parametric Four-Wave Mixing requires only a single laser as an additional phase matched “seeder” field is generated via parametric Four-Wave Mixing of the pump beam in a high gain cell. The seeder field travels collinearly with the pump beam providing efficient nondegenerate Four-Wave Mixing in a second medium. This simple arrangement facilitates the detection of complex molecular spectra by simply scanning the pump laser. Seeded parametric Four-Wave Mixing is demonstrated in both a low pressure cell and an air/acetylene flame with detection of the two-photon C 2Π(v′=0)←X 2Π(v″=0) spectrum of nitric oxide. From the cell data a detection limit of 1012 molecules/cm3 is established. A theoretical model of seeded parametric Four-Wave Mixing is developed from existing parametric Four-Wave Mixing theory. The addition of the seeder field significantly modifies the parametric Four-Wave m...
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Sensitive detection of sodium in a flame using parametric Four-Wave Mixing and seeded parametric Four-Wave Mixing
Physical Review A, 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:Two-photon resonant parametric Four-Wave Mixing and a newly developed variant called seeded parametric Four-Wave Mixing are used to detect trace quantities of sodium in a flame. Both techniques are simple, requiring only a single laser to generate a signal beam at a different Wavelength which propagates collinearly with the pump beam, allowing efficient signal recovery. A comparison of the two techniques reveals that seeded parametric Four-Wave Mixing is more than two orders of magnitude more sensitive than parametric Four-Wave Mixing, with an estimated detection sensitivity of 5 x 10(9) atoms/cm(3). Seeded parametric Four-Wave Mixing is achieved by cascading two parametric Four-Wave Mixing media such that one of the parametric fields generated in the first high-density medium is then used to seed the same Four-Wave Mixing process in a second medium in order to increase the Four-Wave Mixing gain. The behavior of this seeded parametric Four-Wave Mixing is described using semiclassical perturbation theory. A simplified small-signal theory is found to model most of the data satisfactorily. However, an anomalous saturationlike behavior is observed in the large signal regime. The full perturbation treatment, which includes the competition between two different Four-Wave Mixing processes coupled via the signal field, accounts for this apparently anomalous behavior.
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Infrared seeded parametric Four-Wave Mixing for sensitive detection of molecules
Physical Review Letters, 1997Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:We have developed a sensitive resonant Four-Wave Mixing technique based on two-photon parametric Four-Wave Mixing with the addition of a phase matched ''seeder'' field. Generation of the seeder field via the same Four-Wave Mixing process in a high pressure cell enables automatic phase matching to be achieved in a low pressure sample cell. This arrangement facilitates sensitive detection of complex molecular spectra by simply tuning the pump laser. We demonstrate the technique with the detection of nitric oxide down to concentrations more than 4 orders of magnitude below the capability of parametric Four-Wave Mixing alone, with an estimated detection threshold of 10(12) molecules/cm(3).
Mario Dagenais - One of the best experts on this subject based on the ideXlab platform.
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Nearly degenerate Four-Wave Mixing in Fabry–Perot semiconductor lasers
Optics Letters, 1993Co-Authors: Shijun Jiang, Mario DagenaisAbstract:Nearly degenerate Four-Wave Mixing in Fabry–Perot semiconductor lasers is studied for pump–probe detunings that range from a few hundred megahertz to as high as 20 GHz. It is observed that the conjugate reflectivity and probe amplification decrease with slopes of −60 and −20 dB per frequency decade, respectively, when the detuning exceeds the relaxation-oscillation frequency. A resonance enhancement of the Four-Wave Mixing signal is observed at both the relaxation-oscillation frequency and twice the relaxation-oscillation frequency. Cascade Four-Wave Mixing signals are observed under a very weak (−37-dBm) input probe beam. A quantitative fit to the nearly degenerate Four-Wave Mixing data is obtained, permitting the extraction of basic semiconductor-laser parameters by use of this technique.
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Nearly degenerate Four-Wave Mixing in Fabry-Perot semiconductor lasers
Optics letters, 1993Co-Authors: Shijun Jiang, Mario DagenaisAbstract:Nearly degenerate Four-Wave Mixing in Fabry–Perot semiconductor lasers is studied for pump–probe detunings that range from a few hundred megahertz to as high as 20 GHz. It is observed that the conjugate reflectivity and probe amplification decrease with slopes of −60 and −20 dB per frequency decade, respectively, when the detuning exceeds the relaxation-oscillation frequency. A resonance enhancement of the Four-Wave Mixing signal is observed at both the relaxation-oscillation frequency and twice the relaxation-oscillation frequency. Cascade Four-Wave Mixing signals are observed under a very weak (−37-dBm) input probe beam. A quantitative fit to the nearly degenerate Four-Wave Mixing data is obtained, permitting the extraction of basic semiconductor-laser parameters by use of this technique.
Antonio Mecozzi - One of the best experts on this subject based on the ideXlab platform.
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Theory of Four-Wave Mixing
Photonic Devices for Telecommunications, 1999Co-Authors: K. Obermann, Antonio Mecozzi, Jesper MørkAbstract:The present chapter is devoted to presenting the theory of Four-Wave Mixing in semiconductor optical amplifiers (SOAs). At first, a model describing the dynamics in terms of rate equations is developed. The rate equations are derived from density matrix equations, and after coupling with the propagation equation for the field envelope and its phase, a rather general description of the Four-Wave Mixing is arrived at. In the limit of zero scattering loss, the model leads to a very simple description of the effects of Four-Wave Mixing. In the succeeding sections we will concentrate on the advantages and draw-backs of some analytical models based on the coupled-mode theory and used to calculate the FWM performance of SOAs. In addition, the effects of amplified spontaneous emission (ASE) noise are considered. The theoretical models presented here should be of interest for all those performing experimental FWM investigations. Particular attention is given to the validity of the assumptions used in the models.
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Four-Wave Mixing in traveling-Wave semiconductor amplifiers
IEEE Journal of Quantum Electronics, 1995Co-Authors: Antonio Mecozzi, Alessandro D'ottavi, Stefano Scotti, Eugenio Iannone, Paolo SpanòAbstract:The traveling-Wave equations of Four-Wave Mixing in semiconductor amplifiers are solved analytically including saturation of the amplifier. Excellent agreement is obtained with numerical solutions of the traveling-Wave equations. The analytical model is used to analyze a highly nondegenerate Four-Wave Mixing experiment in a bulk semiconductor amplifier. >
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Phase noise of Four‐Wave Mixing in semiconductor lasers
Applied Physics Letters, 1992Co-Authors: Antonio MecozziAbstract:A simple theoretical analysis shows that the linewidth of the conjugate Wave produced in Four‐Wave Mixing in semiconductor lasers is equal to the linewidth of the probe plus Four times the linewidth of the pump. Experimental results in good agreement with the theory are presented. This result implies an enormous enhancement in the phase noise of the conjugate Wave and sets a limitation on some practical applications of Four‐Wave Mixing.
Alan E. W. Knight - One of the best experts on this subject based on the ideXlab platform.
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Seeded parametric Four-Wave Mixing for sensitive detection of atoms and molecules
Technical Digest. Summaries of Papers Presented at the International Quantum Electronics Conference. Conference Edition. 1998 Technical Digest Series , 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Halina Rubinsztein-dunlop, Alan E. W. KnightAbstract:A simple variant of parametric Four-Wave Mixing (PFWM), which we call seeded parametric Four-Wave Mixing (SPFWM), has been developed. This is a near-resonant nondegenerate Four-Wave Mixing technique that offers distinct advantages over similar techniques as it only requires a single beam and is automatically phase matched. Furthermore, the signal is generated at a different Wavelength to, but travels collinear with, the pump beam enabling efficient signal retrieval.
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Sensitive detection of nitric oxide using seeded parametric Four-Wave Mixing
Journal of Chemical Physics, 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:A sensitive near-resonant Four-Wave Mixing technique based on two-photon parametric Four-Wave Mixing has been developed. Seeded parametric Four-Wave Mixing requires only a single laser as an additional phase matched “seeder” field is generated via parametric Four-Wave Mixing of the pump beam in a high gain cell. The seeder field travels collinearly with the pump beam providing efficient nondegenerate Four-Wave Mixing in a second medium. This simple arrangement facilitates the detection of complex molecular spectra by simply scanning the pump laser. Seeded parametric Four-Wave Mixing is demonstrated in both a low pressure cell and an air/acetylene flame with detection of the two-photon C 2Π(v′=0)←X 2Π(v″=0) spectrum of nitric oxide. From the cell data a detection limit of 1012 molecules/cm3 is established. A theoretical model of seeded parametric Four-Wave Mixing is developed from existing parametric Four-Wave Mixing theory. The addition of the seeder field significantly modifies the parametric Four-Wave m...
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Sensitive detection of sodium in a flame using parametric Four-Wave Mixing and seeded parametric Four-Wave Mixing
Physical Review A, 1998Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:Two-photon resonant parametric Four-Wave Mixing and a newly developed variant called seeded parametric Four-Wave Mixing are used to detect trace quantities of sodium in a flame. Both techniques are simple, requiring only a single laser to generate a signal beam at a different Wavelength which propagates collinearly with the pump beam, allowing efficient signal recovery. A comparison of the two techniques reveals that seeded parametric Four-Wave Mixing is more than two orders of magnitude more sensitive than parametric Four-Wave Mixing, with an estimated detection sensitivity of 5 x 10(9) atoms/cm(3). Seeded parametric Four-Wave Mixing is achieved by cascading two parametric Four-Wave Mixing media such that one of the parametric fields generated in the first high-density medium is then used to seed the same Four-Wave Mixing process in a second medium in order to increase the Four-Wave Mixing gain. The behavior of this seeded parametric Four-Wave Mixing is described using semiclassical perturbation theory. A simplified small-signal theory is found to model most of the data satisfactorily. However, an anomalous saturationlike behavior is observed in the large signal regime. The full perturbation treatment, which includes the competition between two different Four-Wave Mixing processes coupled via the signal field, accounts for this apparently anomalous behavior.
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Infrared seeded parametric Four-Wave Mixing for sensitive detection of molecules
Physical Review Letters, 1997Co-Authors: Mark J. Fernée, Peter F. Barker, Alan E. W. Knight, Halina Rubinsztein-dunlopAbstract:We have developed a sensitive resonant Four-Wave Mixing technique based on two-photon parametric Four-Wave Mixing with the addition of a phase matched ''seeder'' field. Generation of the seeder field via the same Four-Wave Mixing process in a high pressure cell enables automatic phase matching to be achieved in a low pressure sample cell. This arrangement facilitates sensitive detection of complex molecular spectra by simply tuning the pump laser. We demonstrate the technique with the detection of nitric oxide down to concentrations more than 4 orders of magnitude below the capability of parametric Four-Wave Mixing alone, with an estimated detection threshold of 10(12) molecules/cm(3).