Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5191594
Q. Nguyen, P. Besnard, O. Vaudel, A. Shen, G. Duan
Injection-locking is based on the fact that the laser can be locked onto the frequency and the phase of an external injected optical signal. When a Fabry-Perot laser diode (FP LD) is locked onto a single-mode signal, its operation becomes single-mode. The injection-locked FP LD (IL-FP LD) has been proposed as a standard component for optical access network [1]. In this paper, we propose to study the Linewidth Enhancement Factor (LEF) of IL-FP LD and its dependence onto the injection parameters.
{"title":"Strong dependence of the Linewidth Enhancement Factor onto an externally injected optical signal for locked Fabry-Perot laser diodes","authors":"Q. Nguyen, P. Besnard, O. Vaudel, A. Shen, G. Duan","doi":"10.1109/CLEOE-EQEC.2009.5191594","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5191594","url":null,"abstract":"Injection-locking is based on the fact that the laser can be locked onto the frequency and the phase of an external injected optical signal. When a Fabry-Perot laser diode (FP LD) is locked onto a single-mode signal, its operation becomes single-mode. The injection-locked FP LD (IL-FP LD) has been proposed as a standard component for optical access network [1]. In this paper, we propose to study the Linewidth Enhancement Factor (LEF) of IL-FP LD and its dependence onto the injection parameters.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117237767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192160
G. Mincuzzi, L. Vesce, R. Riccitelli, A. Reale, A. Di Carlo, T. Brown
Scanning laser processing has become a useful and often used tool in thin film solar cell industries, since it enables precise, low cost, non-contact and highly automated fabrication processes such as scribing, patterning, marking, edge deletion, local melting and sintering. Dye Solar Cells (DSCs) are electrochemical photovoltaic devices representing an attractive technology for large area solar energy conversion since they utilize relatively cheap materials and simple manufacturing processes often “borrowed” from the printing industry. In this paper we show successful application of laser processing to this technology.
{"title":"Laser sintering of photoelectrode layers for Dye Solar Cell technology","authors":"G. Mincuzzi, L. Vesce, R. Riccitelli, A. Reale, A. Di Carlo, T. Brown","doi":"10.1109/CLEOE-EQEC.2009.5192160","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192160","url":null,"abstract":"Scanning laser processing has become a useful and often used tool in thin film solar cell industries, since it enables precise, low cost, non-contact and highly automated fabrication processes such as scribing, patterning, marking, edge deletion, local melting and sintering. Dye Solar Cells (DSCs) are electrochemical photovoltaic devices representing an attractive technology for large area solar energy conversion since they utilize relatively cheap materials and simple manufacturing processes often “borrowed” from the printing industry. In this paper we show successful application of laser processing to this technology.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117271184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192175
N. Pavel, T. Dascălu, V. Lupei, N. Vasile
The optical pumping into the 4F3/2 emitting level of Nd lasers has received special attention in the last years as a means for increasing the laser performances and reduction of heat generation. These advantages were first demonstrated for diluted [1] or concentrated [2] Nd-doped YAG or YVO4 under pumping with Ti:sapphire laser in the region of 0.88 µm. By a careful design of the laser configuration, continuous-wave laser emission at 1.06 µm with nearly quantum defect limited slope efficiencies of 0.80 in Nd-vanadate crystals [3] and of 0.79 in Nd:YAG [4] was soon reported. This paper investigates the possibility to improve the passively Q-switched emission of Nd lasers by direct pumping at 0.88 µm with diode lasers. Average output powers in excess of 1.0 W are reported by switching with Cr4+:YAG saturable absorber (SA) crystals. The influence of doping level on laser characteristics is discussed. Results obtained under the pump at 0.81 µm, into the highly-absorbing 4F5/2 level, are given for comparison.
{"title":"Cr4+:YAG passive Q-switching of directly pumped Nd lasers","authors":"N. Pavel, T. Dascălu, V. Lupei, N. Vasile","doi":"10.1109/CLEOE-EQEC.2009.5192175","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192175","url":null,"abstract":"The optical pumping into the 4F3/2 emitting level of Nd lasers has received special attention in the last years as a means for increasing the laser performances and reduction of heat generation. These advantages were first demonstrated for diluted [1] or concentrated [2] Nd-doped YAG or YVO4 under pumping with Ti:sapphire laser in the region of 0.88 µm. By a careful design of the laser configuration, continuous-wave laser emission at 1.06 µm with nearly quantum defect limited slope efficiencies of 0.80 in Nd-vanadate crystals [3] and of 0.79 in Nd:YAG [4] was soon reported. This paper investigates the possibility to improve the passively Q-switched emission of Nd lasers by direct pumping at 0.88 µm with diode lasers. Average output powers in excess of 1.0 W are reported by switching with Cr4+:YAG saturable absorber (SA) crystals. The influence of doping level on laser characteristics is discussed. Results obtained under the pump at 0.81 µm, into the highly-absorbing 4F5/2 level, are given for comparison.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128771905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5196438
P. Wnuk, Y. Stepanenko, Czeslaw Radzwicz
Optical parametric amplification is, potentially, an attractive method for amplification of femtosecond laser pulses up to TW powers. Parametric amplifiers have several advantages as compared to standard laser amplifiers: no heat accumulation in the gain medium, broadband operation in a noncollinear configuration (over 200 nm @800 nm for BBO crystal), high single pass gain and scaling capability. In order to exploit these advantages, one needs to use high pump intensities, since parametric amplification gain strongly depends on intensity (G ∞ exp(α · √I) , for undepleted pump regime).
{"title":"Simple and efficient 2-TW Optical Parametric Chirped Pulse Amplifier","authors":"P. Wnuk, Y. Stepanenko, Czeslaw Radzwicz","doi":"10.1109/CLEOE-EQEC.2009.5196438","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5196438","url":null,"abstract":"Optical parametric amplification is, potentially, an attractive method for amplification of femtosecond laser pulses up to TW powers. Parametric amplifiers have several advantages as compared to standard laser amplifiers: no heat accumulation in the gain medium, broadband operation in a noncollinear configuration (over 200 nm @800 nm for BBO crystal), high single pass gain and scaling capability. In order to exploit these advantages, one needs to use high pump intensities, since parametric amplification gain strongly depends on intensity (G ∞ exp(α · √I) , for undepleted pump regime).","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128597809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192047
D. Polli, J. Clark, M. Celebrano, G. Grancini, G. Lanzani, G. Cerullo
A peculiar feature of organic semiconductors is structural inhomogeneity: in the solid state they are generally amorphous or polycrystalline, with local order only achieved in mesoscopic domains with size typically ranging from 10 nm to 1 µm [1]. The dimensions and types of these domains have a decisive influence on excited state dynamics, which in turn determines fluorescence quantum yield, charge carrier mobility and generation efficiency, crucial parameters for optimizing the efficiency of organic optoelectronic devices. Femtosecond pump-probe spectroscopy provides a wealth of information on the photophysics of organic semiconductors [2]. Experiments are usually performed over relatively large sample areas, with diameter of the order of several tens of microns, thus obtaining a macroscopic information that is averaged over many mesoscopic domains. In this paper we present a novel instrument which combines the spatial resolution of confocal microscopy with the temporal resolution and spectral sensitivity of femtosecond pump-probe spectroscopy using broadband detection.
{"title":"Ultrafast confocal microscope for time-resolved imaging of thin films","authors":"D. Polli, J. Clark, M. Celebrano, G. Grancini, G. Lanzani, G. Cerullo","doi":"10.1109/CLEOE-EQEC.2009.5192047","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192047","url":null,"abstract":"A peculiar feature of organic semiconductors is structural inhomogeneity: in the solid state they are generally amorphous or polycrystalline, with local order only achieved in mesoscopic domains with size typically ranging from 10 nm to 1 µm [1]. The dimensions and types of these domains have a decisive influence on excited state dynamics, which in turn determines fluorescence quantum yield, charge carrier mobility and generation efficiency, crucial parameters for optimizing the efficiency of organic optoelectronic devices. Femtosecond pump-probe spectroscopy provides a wealth of information on the photophysics of organic semiconductors [2]. Experiments are usually performed over relatively large sample areas, with diameter of the order of several tens of microns, thus obtaining a macroscopic information that is averaged over many mesoscopic domains. In this paper we present a novel instrument which combines the spatial resolution of confocal microscopy with the temporal resolution and spectral sensitivity of femtosecond pump-probe spectroscopy using broadband detection.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128668221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5194830
J. Parravicini, P. Minzioni, V. Degiorgio, E. Delre
Photorefractive media are known to support spatial solitons, i.e. beams that do not spread during propagation because self-focusing may balance natural diffraction [1]. For visible wavelengths this also occurs in lithium-niobate (LN), one of the most important crystals in modern optical technology. Previous studies have shown that when LN is not biased, beams undergo strong self-defocusing. The effect is attributed to the nature of the photovoltaic effect that drives photorefractive charge separation, and in particular to the sign of the relevant Glass coefficient. The result is that in these conditions only one class of solitons can be observed, the so-called dark solitons, consisting in dark notches in an otherwise illuminated wavefront that maintain unaltered their shape [2]. In turn, in unbiased barium-titanate an appropriate geometry can be found for which the photovoltaic nonlinearity is “opposite“ to that of LN and can lead to bright solitons, that is beams that have a bell-like transverse intensity profile centred on the beam axis [3]. Whereas LN is known to support self-focusing and bright solitons through the χ2 nonlinearity [4], or through the screening-photovoltaic nonlinearity, that is when it is biased by an external field [5,6], to date no self-focusing and bright self-trapping is known to occur through the photorefractive effect in an unbiased sample.
{"title":"Photovoltaic self-focusing in lithium niobate","authors":"J. Parravicini, P. Minzioni, V. Degiorgio, E. Delre","doi":"10.1109/CLEOE-EQEC.2009.5194830","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5194830","url":null,"abstract":"Photorefractive media are known to support spatial solitons, i.e. beams that do not spread during propagation because self-focusing may balance natural diffraction [1]. For visible wavelengths this also occurs in lithium-niobate (LN), one of the most important crystals in modern optical technology. Previous studies have shown that when LN is not biased, beams undergo strong self-defocusing. The effect is attributed to the nature of the photovoltaic effect that drives photorefractive charge separation, and in particular to the sign of the relevant Glass coefficient. The result is that in these conditions only one class of solitons can be observed, the so-called dark solitons, consisting in dark notches in an otherwise illuminated wavefront that maintain unaltered their shape [2]. In turn, in unbiased barium-titanate an appropriate geometry can be found for which the photovoltaic nonlinearity is “opposite“ to that of LN and can lead to bright solitons, that is beams that have a bell-like transverse intensity profile centred on the beam axis [3]. Whereas LN is known to support self-focusing and bright solitons through the χ2 nonlinearity [4], or through the screening-photovoltaic nonlinearity, that is when it is biased by an external field [5,6], to date no self-focusing and bright self-trapping is known to occur through the photorefractive effect in an unbiased sample.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129358965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192327
D. Wortmann, I. Mingareev, A. Brand, A. Horn
The miniaturization of optical components claims for new methods for assembling e.g. micro lenses on integrated optical circuits or sealing of OLEDs in order to improve productivity and quality. Welding of glass for micro-technological application is still a field of research, because scaling-down the welding seam into the micrometer scale implicates also sub-micrometer heat-affected zones [1]. The localized melting in the volume and the welding of borosilicate and quarz glasses by ultrafast laser radiation (λ = 1045 nm, IMRA, µJewel D-1000) with femtosecond pulse durations has been investigated. A wide range of further applications like the writing of waveguides [2] and the micro-structuring by material modification and subsequent etching [3] is based on the same initial processes. The non-linear absorption of the fs-laser radiation, localized melting and the fast cooling of the material are the basic processes for all these techniques. Compression and expansion of material lead to refractive index changes as well as local differences in the temperature.
{"title":"Micro-welding of glass by fs-laser irradiation and process observation using fs-pump-probe white light interference microscopy","authors":"D. Wortmann, I. Mingareev, A. Brand, A. Horn","doi":"10.1109/CLEOE-EQEC.2009.5192327","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192327","url":null,"abstract":"The miniaturization of optical components claims for new methods for assembling e.g. micro lenses on integrated optical circuits or sealing of OLEDs in order to improve productivity and quality. Welding of glass for micro-technological application is still a field of research, because scaling-down the welding seam into the micrometer scale implicates also sub-micrometer heat-affected zones [1]. The localized melting in the volume and the welding of borosilicate and quarz glasses by ultrafast laser radiation (λ = 1045 nm, IMRA, µJewel D-1000) with femtosecond pulse durations has been investigated. A wide range of further applications like the writing of waveguides [2] and the micro-structuring by material modification and subsequent etching [3] is based on the same initial processes. The non-linear absorption of the fs-laser radiation, localized melting and the fast cooling of the material are the basic processes for all these techniques. Compression and expansion of material lead to refractive index changes as well as local differences in the temperature.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124561770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5191518
A. Datta, A. Chin, F. Caruso, S. Huelga, M. Plenio
Energy transport in light-harvesting photosynthetic complexes has been a topic of continued interest [1]. It is recognized that the initial steps of natural photosynthesis harness the available light energy at typically about 95–99% efficiency. This has attracted considerable attention recently due to the observation of quantum coherence in the dynamics of photosynthetic complexes using 2D femtosecond spectroscopy [2,3]. On the other hand the dynamics takes place in a very noisy environment and hence it will have to be taken into account when seeking an accurate theoretical description of the dynamics. This has rejuvenated interest in the relative roles of coherent and incoherent dynamics in the enhanced energy transfer in light-harvesting complexes [4–6]. In fact, we find that noise in conjunction with quantum coherence is an essential ingredient for high efficiency excitation transfer in quantum networks. We demonstrate the existence of noise assisted transport at the example of the Fenna-Matthew-Olson (FMO) complex, found in photosynthetic green sulphur bacteria. Similar effects are apparent in other natural systems like LH1 as well as artificial light-harvesting structures like dendrimers. Most importantly, this effect allows us to exploit noise rather than make strenuous attempts to avoid it. In light of this, we can exploit these effects in the transport of energy and information, and other effects [7].
光收集光合复合体的能量传输一直是人们关注的话题[1]。人们认识到，自然光合作用的最初步骤通常以约95-99%的效率利用可利用的光能。最近，由于利用二维飞秒光谱观察到光合复合物动力学中的量子相干性，这引起了相当大的关注[2,3]。另一方面，动力学发生在非常嘈杂的环境中，因此在寻求动力学的准确理论描述时必须考虑到这一点。这使得人们对光收集配合物中增强的能量转移中相干和非相干动力学的相对作用重新产生了兴趣[4-6]。事实上，我们发现噪声与量子相干是量子网络中高效激发转移的重要组成部分。我们以在光合绿硫细菌中发现的fna - matthew - olson (FMO)复合物为例，证明了噪声辅助运输的存在。类似的效果在其他自然系统中也很明显，比如LH1，以及人工光收集结构，比如树状聚合物。最重要的是，这种效应使我们能够利用噪音，而不是费力地试图避免它。鉴于此，我们可以在能量和信息的传输以及其他效应中利用这些效应[7]。
{"title":"Noise enhanced transport in light-harvesting complexes and networks","authors":"A. Datta, A. Chin, F. Caruso, S. Huelga, M. Plenio","doi":"10.1109/CLEOE-EQEC.2009.5191518","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5191518","url":null,"abstract":"Energy transport in light-harvesting photosynthetic complexes has been a topic of continued interest [1]. It is recognized that the initial steps of natural photosynthesis harness the available light energy at typically about 95–99% efficiency. This has attracted considerable attention recently due to the observation of quantum coherence in the dynamics of photosynthetic complexes using 2D femtosecond spectroscopy [2,3]. On the other hand the dynamics takes place in a very noisy environment and hence it will have to be taken into account when seeking an accurate theoretical description of the dynamics. This has rejuvenated interest in the relative roles of coherent and incoherent dynamics in the enhanced energy transfer in light-harvesting complexes [4–6]. In fact, we find that noise in conjunction with quantum coherence is an essential ingredient for high efficiency excitation transfer in quantum networks. We demonstrate the existence of noise assisted transport at the example of the Fenna-Matthew-Olson (FMO) complex, found in photosynthetic green sulphur bacteria. Similar effects are apparent in other natural systems like LH1 as well as artificial light-harvesting structures like dendrimers. Most importantly, this effect allows us to exploit noise rather than make strenuous attempts to avoid it. In light of this, we can exploit these effects in the transport of energy and information, and other effects [7].","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129650659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5196571
F. Doutre, V. Couderc, D. Pagnoux
We take advantage of nonlinear effects in a low birefringence fiber to reshape subnanosecond laser pulses. Both polarization and spectral modulation allow pulse shortening by a factor higher than 10 in the normal dispersion regime.
{"title":"Laser pulse reshaping by means of nonlinear effects in a low birefringence optical fiber","authors":"F. Doutre, V. Couderc, D. Pagnoux","doi":"10.1109/CLEOE-EQEC.2009.5196571","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5196571","url":null,"abstract":"We take advantage of nonlinear effects in a low birefringence fiber to reshape subnanosecond laser pulses. Both polarization and spectral modulation allow pulse shortening by a factor higher than 10 in the normal dispersion regime.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130491675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5191473
P. Spinicelli, B. Mahler, S. Buil, X. Quélin, B. Dubertret, J. Hermier
Fluorescence spectroscopy studies have shown that, at a single molecule level, fluorophore emission intensity fluctuates between bright and dark states. These fluctuations, known as blinking, are the main drawback of fluorophores in single molecule experiments. Statistical analysis of these intensity fluctuations have demonstrated that the dark states duration exhibits a universal heavy-tailed power law distribution in organic as well as inorganic fluorophores. However, the precise reasons underlying the blinking of single fluorophores are still matter of debate and whether it can be suppressed is not clear.
{"title":"Quantum engineering of colloidal core-shell quantum dots: towards non blinking quantum dots and biexcitonic emission","authors":"P. Spinicelli, B. Mahler, S. Buil, X. Quélin, B. Dubertret, J. Hermier","doi":"10.1109/CLEOE-EQEC.2009.5191473","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5191473","url":null,"abstract":"Fluorescence spectroscopy studies have shown that, at a single molecule level, fluorophore emission intensity fluctuates between bright and dark states. These fluctuations, known as blinking, are the main drawback of fluorophores in single molecule experiments. Statistical analysis of these intensity fluctuations have demonstrated that the dark states duration exhibits a universal heavy-tailed power law distribution in organic as well as inorganic fluorophores. However, the precise reasons underlying the blinking of single fluorophores are still matter of debate and whether it can be suppressed is not clear.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129211011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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