The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
N. Peyghambarian - One of the best experts on this subject based on the ideXlab platform.
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2μm lasing from highly thulium doped tellurite glass microsphere
Applied Physics Letters, 2005Co-Authors: Jianfeng Wu, Shibin Jiang, Makoto Kuwatagonokami, N. PeyghambarianAbstract:A single mode microsphere Laser at 2μm is demonstrated from a highly thulium doped tellurite glass microsphere. Glass samples with various doping concentrations are fabricated and characterized to choose the material with the highest pump efficiency. The Laser Wavelength is redshifted from the emission peak of thulium ions at 1800 nm due to the different mode distribution inside the microsphere. The Laser line width (full width at half maximum) is measured as 115 MHz.
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temperature dependence of the Wavelength and threshold of fiber taper coupled l band er3 doped tellurite glass microsphere Laser
Applied Physics Letters, 2003Co-Authors: Xiang Peng, Shibin Jiang, Makoto Kuwatagonokami, Feng Song, N. PeyghambarianAbstract:We report on the temperature dependence of L-band Laser emission of fiber-taper-coupled Er3+-doped tellurite glass microsphere. The microsphere Laser emission threshold increased and the emitted Laser Wavelength shifted with temperature. The experimental results are explained with a quasi-four-level model, showing that a significant reduction of Laser threshold can be achieved at lower temperatures and higher Q values of this microsphere Laser.
Marti Rochette - One of the best experts on this subject based on the ideXlab platform.
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all chalcogenide raman parametric Laser Wavelength converter and amplifier in a single microwire
IEEE Journal of Selected Topics in Quantum Electronics, 2014Co-Authors: Raja Ahmad, Marti RochetteAbstract:Compact, power efficient, and fiber-compatible Lasers, Wavelength converters, and amplifiers are vital devices for the future of fiber-optic systems and networks. Nonlinear optical effects, like Raman scattering and parametric four-wave mixing, offer a way to realize such devices. Here, we use a single chalcogenide microwire to realize a device that provides the functions of a Stokes Raman-parametric Laser, a four-wave mixing anti-Stokes Wavelength converter, an ultra-broadband Stokes/anti-Stokes Raman amplifier and a supercontinuum generator. The device operation relies on ultrahigh Raman and Kerr gain that are up to five orders of magnitude larger than in silica fibers, precisely engineered chromatic dispersion, and high photosensitivity of the chalcogenide microwire. Owing to the underlying principle of nonlinear optical processes, the device is anticipated to operate over the entire transmission window of the chalcogenide glass (λ ~ 1-10 μm).
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all chalcogenide raman parametric Laser Wavelength converter and amplifier in a single microwire
arXiv: Optics, 2013Co-Authors: Raja Ahmad, Marti RochetteAbstract:Compact, power efficient and fiber compatible Lasers, Wavelength converters and amplifiers are vital ingredients for the future fiber optic systems and networks. Nonlinear optical effects, like Raman scattering and parametric four wave mixing, offer a way to realize such devices. Here we use a single chalcogenide microwire to realize a device that provides the functions of a Stokes Raman parametric Laser, a four wave mixing anti Stokes Wavelength converter, and an ultra broadband Stokes/anti Stokes Raman amplifier or supercontinuum generator. The device operation relies on ultrahigh Raman and Kerr gain (upto five orders of magnitude larger than in silica fibers), precisely engineered chromatic dispersion and high photosensitivity of the chalcogenide microwire. The Raman parametric Laser operates at a record low threshold average (peak) pump power of 52 \muW (207 mW) and a slope efficiency of >2%. A powerful anti Stokes signal is generated via the nonlinear four wave mixing process. As amplifier or the broadband source, the device covers a Wavelength (frequency) range of >330 nm (47 THz) when pumped at a Wavelength of 1550 nm. Owing to the underlying principle of operation of the device being the nonlinear optical processes, the device is anticipated to operate over the entire transmission window of the chalcogenide glass ({\lambda}~1 10 \mum).
Liuqing Yang - One of the best experts on this subject based on the ideXlab platform.
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distributed Laser charging a wireless power transfer approach
IEEE Internet of Things Journal, 2018Co-Authors: Qingqing Zhang, Wen Fang, Qingwen Liu, Pengfei Xia, Liuqing YangAbstract:Wireless power transfer (WPT) is a promising solution to provide convenient and perpetual energy supplies to electronics. Traditional WPT technologies face the challenge of providing Watt-level power over meter-level distance for Internet of Things (IoT) and mobile devices, such as sensors, controllers, smart-phones, laptops, etc. Distributed Laser charging (DLC), a new WPT alternative, has the potential to solve these problems and enable WPT with the similar experience as WiFi communications. In this paper, we present a multimodule DLC system model, in order to illustrate its physical fundamentals and mathematical formula. This analytical modeling enables the evaluation of power conversion or transmission for each individual module, considering the impacts of Laser Wavelength, transmission attenuation, and photovoltaic-cell (PV-cell) temperature. Based on the linear approximation of electricity-to-Laser and Laser-to-electricity power conversion validated by measurement and simulation, we derive the maximum power transmission efficiency in closed-form. Thus, we demonstrate the variation of the maximum power transmission efficiency depending on the supply power at the transmitter, Laser Wavelength, transmission distance, and PV-cell temperature. Similar to the maximization of information transmission capacity in wireless information transfer (WIT), the maximization of the power transmission efficiency is equally important in WPT. Therefore, this paper not only provides the insight of DLC in theory, but also offers the guideline of DLC system design in practice.
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distributed Laser charging a wireless power transfer approach
arXiv: Signal Processing, 2017Co-Authors: Qingqing Zhang, Wen Fang, Qingwen Liu, Pengfei Xia, Liuqing YangAbstract:Wireless power transfer (WPT) is a promising solution to provide convenient and perpetual energy supplies to electronics. Traditional WPT technologies face the challenge of providing Watt-level power over meter-level distance for Internet of Things (IoT) and mobile devices, such as sensors, controllers, smart-phones, laptops, etc.. Distributed Laser charging (DLC), a new WPT alternative, has the potential to solve these problems and enable WPT with the similar experience as WiFi communications. In this paper, we present a multi-module DLC system model, in order to illustrate its physical fundamentals and mathematical formula. This analytical modeling enables the evaluation of power conversion or transmission for each individual module, considering the impacts of Laser Wavelength, transmission attenuation and photovoltaic-cell (PV-cell) temperature. Based on the linear approximation of electricity-to-Laser and Laser-to-electricity power conversion validated by measurement and simulation, we derive the maximum power transmission efficiency in closed-form. Thus, we demonstrate the variation of the maximum power transmission efficiency depending on the supply power at the transmitter, Laser Wavelength, transmission distance, and PV-cell temperature. Similar to the maximization of information transmission capacity in wireless information transfer (WIT), the maximization of the power transmission efficiency is equally important in WPT. Therefore, this work not only provides the insight of DLC in theory, but also offers the guideline of DLC system design in practice.
Makoto Kuwatagonokami - One of the best experts on this subject based on the ideXlab platform.
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2μm lasing from highly thulium doped tellurite glass microsphere
Applied Physics Letters, 2005Co-Authors: Jianfeng Wu, Shibin Jiang, Makoto Kuwatagonokami, N. PeyghambarianAbstract:A single mode microsphere Laser at 2μm is demonstrated from a highly thulium doped tellurite glass microsphere. Glass samples with various doping concentrations are fabricated and characterized to choose the material with the highest pump efficiency. The Laser Wavelength is redshifted from the emission peak of thulium ions at 1800 nm due to the different mode distribution inside the microsphere. The Laser line width (full width at half maximum) is measured as 115 MHz.
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temperature dependence of the Wavelength and threshold of fiber taper coupled l band er3 doped tellurite glass microsphere Laser
Applied Physics Letters, 2003Co-Authors: Xiang Peng, Shibin Jiang, Makoto Kuwatagonokami, Feng Song, N. PeyghambarianAbstract:We report on the temperature dependence of L-band Laser emission of fiber-taper-coupled Er3+-doped tellurite glass microsphere. The microsphere Laser emission threshold increased and the emitted Laser Wavelength shifted with temperature. The experimental results are explained with a quasi-four-level model, showing that a significant reduction of Laser threshold can be achieved at lower temperatures and higher Q values of this microsphere Laser.
Pavel Peterka - One of the best experts on this subject based on the ideXlab platform.
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self swept holmium fiber Laser near 2100 nm
Optics Express, 2017Co-Authors: Jan Aubrecht, Pavel Peterka, Pavel Koska, Ondřej Podrazký, Filip Todorov, Pavel Honzatko, Ivan KasikAbstract:Self-sweeping of Laser Wavelength corresponding to holmium emission near 2100 nm is reported. The sweeping occurred in ~4 nm interval with rate ~0.7 nm/s from longer towards shorter Wavelengths. Origins of the selection of the sweeping direction are discussed. The Laser Wavelength drift with time was registered by Fourier transform infrared spectrometer. To our knowledge it is the first observation of self-swept fiber Laser beyond 2000 nm.
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reflectivity of transient bragg reflection gratings in fiber Laser with Laser Wavelength self sweeping erratum
Optics Express, 2016Co-Authors: Pavel Peterka, Jan Aubrecht, Pavel Koska, Ondřej Podrazký, Filip Todorov, Pavel Honzatko, Ivan KasikAbstract:This erratum presents a correction to the computed reflection spectra of transient fiber Bragg gratings that are spontaneously built-up in the ytterbium-doped fiber of the fiber Laser with Laser Wavelength self-sweeping. The corrected spectra have high reflectivity reaching values up to 100%. Therefore, they still more support the conclusion drawn in the original paper that self-sweeping is an important mechanism for triggering the self-Q-switched regime with giant pulse generation.
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Self-induced Laser line sweeping and self-pulsing in double-clad fiber Lasers in Fabry-Perot and unidirectional ring cavities
2012Co-Authors: Pavel Peterka, P. Navrátil, Bernard Dussardier, R. Slavik, P. Honzatko, Václav KubečekAbstract:Rare-earth doped fiber Lasers are subject to instabilities and various self-pulsed regimes that can lead to catastrophic damage of their components. An interesting self-pulsing regime accompanied with Laser Wavelength drift with time is the so called self-induced Laser line sweeping (SLLS). Despite the early observations of the SLLS in solid-state ruby Lasers, in fiber Lasers it was first time mentioned in literature only in 2009 where such a Laser Wavelength drift with time was observed in a relatively broad range of about 1076 -1084 nm in ring ytterbium-doped fiber Laser (YDFL). The main characteristic of the SLLS is the scanning of the Laser Wavelength from shorter to longer Wavelength, spanning over large interval of several nanometers, and instantaneous bounce backward. The period of this sweeping is usually quite long, of the order of seconds. This spectacular effect was attributed to spatial-hole burning caused by standing-wave in the Laser cavity. In this paper we present experimental investigation of the SLLS in YDFLs in Fabry-Perot cavity and ring cavities. The SLLS was observed also in erbium-doped fiber Laser around 1560 nm. We present for the first time observation of the Laser Wavelength sweep in reverse direction, i.e., from longer towards shorter Wavelengths. It was observed in YDFL around 1080 nm.
