The Experts below are selected from a list of 140283 Experts worldwide ranked by ideXlab platform
Sébastien Chénais - One of the best experts on this subject based on the ideXlab platform.
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High brightness diode-pumped Organic Solid-state laser
Applied Physics Letters, 2015Co-Authors: Zhuang Zhao, Sébastien Chénais, Oussama Mhibik, Malik Nafa, Sébastien ForgetAbstract:High-power, diffraction-limited Organic Solid-state laser operation has been achieved in a vertical external cavity surface-emitting Organic laser (VECSOL), pumped by a low-cost compact blue laser diode. The diode-pumped VECSOLs were demonstrated with various dyes in a polymer matrix, leading to laser emissions from 540 nm to 660 nm. Optimization of both the pump pulse duration and output coupling leads to a pump slope efficiency of 11% for a DCM based VECSOLs. We report output pulse energy up to 280 nJ with 100 ns long pump pulses, leading to a peak power of 3.5 W in a circularly symmetric, diffraction-limited beam.
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Thermal effects in thin-film Organic Solid-state lasers
Optics Express, 2014Co-Authors: Zhuang Zhao, Sébastien Forget, Oussama Mhibik, Tatiana Leang, Sébastien ChénaisAbstract:With the recent development of Organic Solid-state lasers (OSSLs) architectures enabling power scaling and progresses towards continuous-wave operation, the question of thermal effects now arises in OSSLs. In this paper, a Rhodamine 640-PMMA based vertical external cavity surface emitting Organic laser is investigated. A thermal microscope is used to record temperature maps at the Organic thin film surface during laser action; those maps are compared with time-resolved finite element thermal simulations. The measured and simulated peak temperature rises are in good accordance and are shown to remain below 10 K in standard operating conditions, showing a negligible impact on performance. The validated model is used to investigate typical OSSL structures from the literature, in a virtual high average power regime, and up to the CW regime. It is shown that whenever true CW Organic lasing will be realized, significant thermal effects will have to be considered and properly managed.
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Organic Solid-State Lasers
Springer Series in Optical Sciences, 2013Co-Authors: Sébastien Forget, Sébastien ChénaisAbstract:Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as Solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of Organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with Organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes Organic Solid-state Organic lasers specific. The laser architectures used in Organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of Organic semiconductor lasers. A last chapter covers the applications of Organic Solid-state lasers
Sébastien Forget - One of the best experts on this subject based on the ideXlab platform.
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High brightness diode-pumped Organic Solid-state laser
Applied Physics Letters, 2015Co-Authors: Zhuang Zhao, Sébastien Chénais, Oussama Mhibik, Malik Nafa, Sébastien ForgetAbstract:High-power, diffraction-limited Organic Solid-state laser operation has been achieved in a vertical external cavity surface-emitting Organic laser (VECSOL), pumped by a low-cost compact blue laser diode. The diode-pumped VECSOLs were demonstrated with various dyes in a polymer matrix, leading to laser emissions from 540 nm to 660 nm. Optimization of both the pump pulse duration and output coupling leads to a pump slope efficiency of 11% for a DCM based VECSOLs. We report output pulse energy up to 280 nJ with 100 ns long pump pulses, leading to a peak power of 3.5 W in a circularly symmetric, diffraction-limited beam.
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Thermal effects in thin-film Organic Solid-state lasers
Optics Express, 2014Co-Authors: Zhuang Zhao, Sébastien Forget, Oussama Mhibik, Tatiana Leang, Sébastien ChénaisAbstract:With the recent development of Organic Solid-state lasers (OSSLs) architectures enabling power scaling and progresses towards continuous-wave operation, the question of thermal effects now arises in OSSLs. In this paper, a Rhodamine 640-PMMA based vertical external cavity surface emitting Organic laser is investigated. A thermal microscope is used to record temperature maps at the Organic thin film surface during laser action; those maps are compared with time-resolved finite element thermal simulations. The measured and simulated peak temperature rises are in good accordance and are shown to remain below 10 K in standard operating conditions, showing a negligible impact on performance. The validated model is used to investigate typical OSSL structures from the literature, in a virtual high average power regime, and up to the CW regime. It is shown that whenever true CW Organic lasing will be realized, significant thermal effects will have to be considered and properly managed.
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Organic Solid-State Lasers
Springer Series in Optical Sciences, 2013Co-Authors: Sébastien Forget, Sébastien ChénaisAbstract:Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as Solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of Organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with Organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes Organic Solid-state Organic lasers specific. The laser architectures used in Organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of Organic semiconductor lasers. A last chapter covers the applications of Organic Solid-state lasers
Zhuang Zhao - One of the best experts on this subject based on the ideXlab platform.
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High brightness diode-pumped Organic Solid-state laser
Applied Physics Letters, 2015Co-Authors: Zhuang Zhao, Sébastien Chénais, Oussama Mhibik, Malik Nafa, Sébastien ForgetAbstract:High-power, diffraction-limited Organic Solid-state laser operation has been achieved in a vertical external cavity surface-emitting Organic laser (VECSOL), pumped by a low-cost compact blue laser diode. The diode-pumped VECSOLs were demonstrated with various dyes in a polymer matrix, leading to laser emissions from 540 nm to 660 nm. Optimization of both the pump pulse duration and output coupling leads to a pump slope efficiency of 11% for a DCM based VECSOLs. We report output pulse energy up to 280 nJ with 100 ns long pump pulses, leading to a peak power of 3.5 W in a circularly symmetric, diffraction-limited beam.
-
Thermal effects in thin-film Organic Solid-state lasers
Optics Express, 2014Co-Authors: Zhuang Zhao, Sébastien Forget, Oussama Mhibik, Tatiana Leang, Sébastien ChénaisAbstract:With the recent development of Organic Solid-state lasers (OSSLs) architectures enabling power scaling and progresses towards continuous-wave operation, the question of thermal effects now arises in OSSLs. In this paper, a Rhodamine 640-PMMA based vertical external cavity surface emitting Organic laser is investigated. A thermal microscope is used to record temperature maps at the Organic thin film surface during laser action; those maps are compared with time-resolved finite element thermal simulations. The measured and simulated peak temperature rises are in good accordance and are shown to remain below 10 K in standard operating conditions, showing a negligible impact on performance. The validated model is used to investigate typical OSSL structures from the literature, in a virtual high average power regime, and up to the CW regime. It is shown that whenever true CW Organic lasing will be realized, significant thermal effects will have to be considered and properly managed.
Jukka Rintala - One of the best experts on this subject based on the ideXlab platform.
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Anaerobic digestion of Organic Solid poultry slaughterhouse waste--a review.
Bioresource technology, 2002Co-Authors: Erno Salminen, Jukka RintalaAbstract:This work reviews the potential of anaerobic digestion for material recovery and energy production from poultry slaughtering by-products and wastes. First, we describe and quantify Organic Solid by-products and wastes produced in poultry farming and poultry slaughterhouses and discuss their recovery and disposal options. Then we review certain fundamental aspects of anaerobic digestion considered important for the digestion of Solid slaughterhouse wastes. Finally, we present an overview of the future potential and current experience of the anaerobic digestion treatment of these materials.
Nuhaa Soobhany - One of the best experts on this subject based on the ideXlab platform.
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inactivation of bacterial pathogenic load in compost against vermicompost of Organic Solid waste aiming to achieve sanitation goals a review
Waste Management, 2017Co-Authors: Nuhaa Soobhany, Romeela Mohee, Vinod Kumar GargAbstract:Waste management strategies for Organic residues, such as composting and vermicomposting, have been implemented in some developed and developing countries to solve the problem of Organic Solid waste (OSW). Yet, these biological treatment technologies do not always result in good quality compost or vermicompost with regards to sanitation capacity owing to the presence of bacterial pathogenic substances in objectionable concentrations. The presence of pathogens in soil conditioners poses a potential health hazard and their occurrence is of particular significance in composts and/or vermicomposts produced from Organic materials. Past and present researches demonstrated a high-degree of agreement that various pathogens survive after the composting of certain OSW but whether similar changes in bacterial pathogenic loads arise during vermitechnology has not been thoroughly elucidated. This review garners information regarding the status of various pathogenic bacteria which survived or diffused after the composting process compared to the status of these pathogens after the vermicomposting of OSW with the aim of achieving sanitation goals. This work is also indispensable for the specification of compost quality guidelines concerning pathogen loads which would be specific to treatment technology. It was hypothesized that vermicomposting process for OSW can be efficacious in sustaining the existence of pathogenic organisms most specifically; human pathogens under safety levels. In summary, earthworms can be regarded as a way of obliterating pathogenic bacteria from OSW in a manner equivalent to earthworm gut transit mechanism which classifies vermicomposting as a promising sanitation technique in comparison to composting processes.
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comparison of heavy metals content in compost against vermicompost of Organic Solid waste past and present
Resources Conservation and Recycling, 2014Co-Authors: Romeela Mohee, Nuhaa SoobhanyAbstract:Abstract Disposal of the municipal Organic Solid waste is a serious problem worldwide. Composting is one of the most preferred methods of Solid waste management practice, principally due to the high percentage of Organic material in the waste composition. Composting has advantages over land-filling and incineration in Mauritius because of lower operational costs, less environmental pollution, beneficial use of the end product, high humidity and Organic content of household waste. Vermicomposting is a comparatively enhanced method in composting, and involves the stabilization of Organic Solid waste through earthworm consumption that converts the waste into earthworm castings. In both composting and vermicomposting processes, the presence of heavy metals and different toxics substances limits its land use without processing. The production and application of compost potentially contaminate the environment with heavy metals. There is a high-degree of consensus in the past and present literatures that composting increases metal concentrations but whether similar changes in metal concentration and availability occur during vermicomposting has not been fully resolved. This review deals with various total metal contents present in composting compared to that present in vermicomposting of Organic Solid wastes from past and present years.
