The Experts below are selected from a list of 6906 Experts worldwide ranked by ideXlab platform
Yasutake Ohishi - One of the best experts on this subject based on the ideXlab platform.
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Slow-Light Generation and waveform correction via Brillouin scattering in tellurite fiber
Frontiers in Optics, 2014Co-Authors: Kenshiro Nagasaka, Takenobu Suzuki, Yasutake OhishiAbstract:Slow-Light Generation and waveform correction are theoretically investigated in tellurite fiber. Our results shows that a minimum pulse broadening factor of 0.93 with an acceptable pulse distortion for 80 ns incident Gaussian pulse is achieved by optimizing the doublet Brillouin gain lines.
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Visible Light Generation and its influence to supercontinuum in As2S3 microstructured fiber
CLEO: 2011 - Laser Science to Photonic Applications, 2011Co-Authors: Meisong Liao, Takenobu Suzuki, Chihiro Kito, Mohammed El-amraoui, Jean-charles Jules, Grégory Gadret, Frédéric Désévédavy, Frédéric Smektala, Yasutake OhishiAbstract:We demonstrate visible Light Generation in As2S3 microstructured fiber for the first time. It limits the spectral range of supercontinuum. The visible Light Generation can be avoided by designing the fiber for the single-mode operation.
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Highly efficient Brillouin slow Light Generation using a single mode tellurite fiber
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Hideyuki Sotobayashi, Takenobu Suzuki, Masahito Tsuchiya, Atsushi Mori, Yasutake OhishiAbstract:We demonstrate highly-efficient Brillouin slow-Light-Generation in a low loss tellurite fiber. A time-delay of 74 ns is achieved for an input pulse of 40 ns width in a 200 m long fiber with a pump power of 19.7 mW.
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Stimulated Brillouin Scattering in a Single-Mode Tellurite Fiber for Amplification, Lasing, and Slow Light Generation
Journal of Lightwave Technology, 2008Co-Authors: Hideyuki Sotobayashi, Takenobu Suzuki, Atsushi Mori, Masahiro Tsuchiya, Yasutake OhishiAbstract:In this paper, Brillouin gain performances of tellurite fiber are investigated for photonics applications. We demonstrate stimulated Brillouin amplification and lasing and the simulated performance of slow Light Generation in a single-mode tellurite fiber. A Brillouin gain of 29 dB is achieved in a 100-m tellurite fiber with a pump power of 10 mW at 1550 nm. A peak value of Brillouin gain coefficients of 1.6989 X 10-10 m/W is measured on the base of gain characteristics. An all-fiber Brillouin laser with the maximum unsaturated power of 54.6 mW at 1550 nm and a slope efficiency of 38.2% is achieved from a 200-m tellurite fiber by employing a ring cavity. Furthermore, widely tunable (~27 nm) Brillouin comb laser with 26 lines spaced at 7.97 GHz is obtained from the ring laser cavity including an erbium-doped fiber amplifier (EDFA). A simple theoretical model based on laser threshold theory successfully explains the properties of Brillouin comb lasers. Stimulated Brillouin scattering (SBS)-induced time delay per unit power and per unit length is also calculated using the measured data of Brillouin gain coefficients. A peak value of 0.09246 ns/mW/m and a time delay slope efficiency of 1.75 ns/dB are obtained for this tellurite fiber. Potential performance of a tellurite fiber for slow Light Generation is clarified on the base of Brillouin gain characteristic. Our results show that tellurite fiber is a promising gain medium for Brillouin fiber amplifiers, lasers, and slow Light Generation due to its low background loss and large Brillouin gain coefficient.
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Stimulated Raman and Brillouin scattering in tellurite glasses for slow Light Generation
Active and Passive Optical Components for Communications VII, 2007Co-Authors: Rajan Jose, Takenobu Suzuki, Yasutake OhishiAbstract:In this study, we investigated the performance of slow Light Generation via SBS or SRS in tellurite glass based on characterization of Raman and Brillouin gain coefficients and an evaluation method of slow Light Generation we developed. The effects of different heavy metal oxides additions on slow Light Generation via SRS in tellurite glass are also discussed. Our results show that designed tellurite glass is a promising candidate for slow Light Generation via SBS or SRS due to its high Raman and Brillouin gain coefficients.
Jordi Martorell - One of the best experts on this subject based on the ideXlab platform.
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Whispering gallery microresonators for second harmonic Light Generation from a low number of small molecules
Nature Communications, 2011Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:Small molecules can be detected by second harmonic Light Generation, but sensitive detection usually requires a large number of molecules and a high-power laser source. Here, relatively low numbers of molecules are detected using Q spherical microresonators and low average power.
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Whispering gallery microresonators for second harmonic Light Generation from a low number of small molecules
Nature Communications, 2011Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:Unmarked sensitive detection of molecules is needed in environmental pollution monitoring, disease diagnosis, security screening systems and in many other situations in which a substance must be identified. When molecules are attached or adsorbed onto an interface, detecting their presence is possible using second harmonic Light Generation, because at interfaces the inversion symmetry is broken. However, such Light Generation usually requires either dense matter or a large number of molecules combined with high-power laser sources. Here we show that using high-Q spherical microresonators and low average power, between 50 and 100 small non-fluorescent molecules deposited on the outer surface of the microresonator can generate a detectable change in the second harmonic Light. This Generation requires phase matching in the whispering gallery modes, which we achieved using a new procedure to periodically pattern, with nanometric precision, a molecular surface monolayer.
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Surface nonlinear Light Generation in microresonators
CLEO Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:The resonance shift produced by molecules bound to the outer surface of toroidal resonators [1] proved that such resonators or other type of circular cavities could become an essential tool for the detection of very small concentrations of molecules. The high sensitivity of devices based on such type of micro-resonators resides on the high value of the quality factor for the cavity (Q∼108) and on an evanescent field that penetrates the surrounding medium.[2] The performance of such micro resonators as sensors could be enhanced if the molecule to be detected played a direct role in the Light Generation process. In a process such as surface second harmonic Generation (SHG) in total internal reflection geometry not only the propagation but also the Light Generation within the micro-resonator is directly related to the chemical composition of the surface.
Takenobu Suzuki - One of the best experts on this subject based on the ideXlab platform.
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Slow-Light Generation and waveform correction via Brillouin scattering in tellurite fiber
Frontiers in Optics, 2014Co-Authors: Kenshiro Nagasaka, Takenobu Suzuki, Yasutake OhishiAbstract:Slow-Light Generation and waveform correction are theoretically investigated in tellurite fiber. Our results shows that a minimum pulse broadening factor of 0.93 with an acceptable pulse distortion for 80 ns incident Gaussian pulse is achieved by optimizing the doublet Brillouin gain lines.
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Visible Light Generation and Its Influence on Supercontinuum in Chalcogenide As2S3 Microstructured Optical Fiber
Applied Physics Express, 2011Co-Authors: Meisong Liao, Takenobu Suzuki, Chihiro Kito, Mohammed El-amraoui, Jean-charles Jules, Grégory Gadret, Tomas Kohoutek, Frédéric DésévédavyAbstract:We demonstrate visible Light Generation in chalcogenide As2S3 microstructured optical fiber. The generated visible Light causes irreversible damage to the fiber core because of the high absorption coefficient of chalcogenide glasses in the visible band. The SCs (supercontinua) are measured in both untapered and tapered As2S3 fibers, no wider SC is obtained in the tapered one. The SC growth is prevented by the visible Light Generation since the damage to the fiber core decreases the fiber transmission substantially. This effect can be avoided by designing the fiber to enable the pump source to work in single-mode operation.
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Visible Light Generation and its influence to supercontinuum in As2S3 microstructured fiber
CLEO: 2011 - Laser Science to Photonic Applications, 2011Co-Authors: Meisong Liao, Takenobu Suzuki, Chihiro Kito, Mohammed El-amraoui, Jean-charles Jules, Grégory Gadret, Frédéric Désévédavy, Frédéric Smektala, Yasutake OhishiAbstract:We demonstrate visible Light Generation in As2S3 microstructured fiber for the first time. It limits the spectral range of supercontinuum. The visible Light Generation can be avoided by designing the fiber for the single-mode operation.
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Visible Light Generation and its influence to supercontinuum in As 2 S 3 microstructured fiber
CLEO:2011 - Laser Applications to Photonic Applications, 2011Co-Authors: Meisong Liao, Takenobu Suzuki, Chihiro Kito, Mohammed El-amraoui, Jean-charles Jules, Grégory Gadret, Frédéric Désévédavy, Frédéric SmektalaAbstract:We demonstrate visible Light Generation in As 2 S 3 microstructured fiber for the first time. It limits the spectral range of supercontinuum. The visible Light Generation can be avoided by designing the fiber for the single-mode operation.
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Highly efficient Brillouin slow Light Generation using a single mode tellurite fiber
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Hideyuki Sotobayashi, Takenobu Suzuki, Masahito Tsuchiya, Atsushi Mori, Yasutake OhishiAbstract:We demonstrate highly-efficient Brillouin slow-Light-Generation in a low loss tellurite fiber. A time-delay of 74 ns is achieved for an input pulse of 40 ns width in a 200 m long fiber with a pump power of 19.7 mW.
J. L. Dominguez-juarez - One of the best experts on this subject based on the ideXlab platform.
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Whispering gallery microresonators for second harmonic Light Generation from a low number of small molecules
Nature Communications, 2011Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:Small molecules can be detected by second harmonic Light Generation, but sensitive detection usually requires a large number of molecules and a high-power laser source. Here, relatively low numbers of molecules are detected using Q spherical microresonators and low average power.
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Whispering gallery microresonators for second harmonic Light Generation from a low number of small molecules
Nature Communications, 2011Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:Unmarked sensitive detection of molecules is needed in environmental pollution monitoring, disease diagnosis, security screening systems and in many other situations in which a substance must be identified. When molecules are attached or adsorbed onto an interface, detecting their presence is possible using second harmonic Light Generation, because at interfaces the inversion symmetry is broken. However, such Light Generation usually requires either dense matter or a large number of molecules combined with high-power laser sources. Here we show that using high-Q spherical microresonators and low average power, between 50 and 100 small non-fluorescent molecules deposited on the outer surface of the microresonator can generate a detectable change in the second harmonic Light. This Generation requires phase matching in the whispering gallery modes, which we achieved using a new procedure to periodically pattern, with nanometric precision, a molecular surface monolayer.
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Surface nonlinear Light Generation in microresonators
CLEO Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:The resonance shift produced by molecules bound to the outer surface of toroidal resonators [1] proved that such resonators or other type of circular cavities could become an essential tool for the detection of very small concentrations of molecules. The high sensitivity of devices based on such type of micro-resonators resides on the high value of the quality factor for the cavity (Q∼108) and on an evanescent field that penetrates the surrounding medium.[2] The performance of such micro resonators as sensors could be enhanced if the molecule to be detected played a direct role in the Light Generation process. In a process such as surface second harmonic Generation (SHG) in total internal reflection geometry not only the propagation but also the Light Generation within the micro-resonator is directly related to the chemical composition of the surface.
Gregory Kozyreff - One of the best experts on this subject based on the ideXlab platform.
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Whispering gallery microresonators for second harmonic Light Generation from a low number of small molecules
Nature Communications, 2011Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:Small molecules can be detected by second harmonic Light Generation, but sensitive detection usually requires a large number of molecules and a high-power laser source. Here, relatively low numbers of molecules are detected using Q spherical microresonators and low average power.
-
Whispering gallery microresonators for second harmonic Light Generation from a low number of small molecules
Nature Communications, 2011Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:Unmarked sensitive detection of molecules is needed in environmental pollution monitoring, disease diagnosis, security screening systems and in many other situations in which a substance must be identified. When molecules are attached or adsorbed onto an interface, detecting their presence is possible using second harmonic Light Generation, because at interfaces the inversion symmetry is broken. However, such Light Generation usually requires either dense matter or a large number of molecules combined with high-power laser sources. Here we show that using high-Q spherical microresonators and low average power, between 50 and 100 small non-fluorescent molecules deposited on the outer surface of the microresonator can generate a detectable change in the second harmonic Light. This Generation requires phase matching in the whispering gallery modes, which we achieved using a new procedure to periodically pattern, with nanometric precision, a molecular surface monolayer.
-
Surface nonlinear Light Generation in microresonators
CLEO Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009Co-Authors: J. L. Dominguez-juarez, Gregory Kozyreff, Jordi MartorellAbstract:The resonance shift produced by molecules bound to the outer surface of toroidal resonators [1] proved that such resonators or other type of circular cavities could become an essential tool for the detection of very small concentrations of molecules. The high sensitivity of devices based on such type of micro-resonators resides on the high value of the quality factor for the cavity (Q∼108) and on an evanescent field that penetrates the surrounding medium.[2] The performance of such micro resonators as sensors could be enhanced if the molecule to be detected played a direct role in the Light Generation process. In a process such as surface second harmonic Generation (SHG) in total internal reflection geometry not only the propagation but also the Light Generation within the micro-resonator is directly related to the chemical composition of the surface.