Pub Date : 2009-06-14DOI: 10.1109/CLEOE-EQEC.2009.5192945
S. Zwick, M. Warber, L. He, C. Schaub, T. Haist, W. Osten
Optical tweezers are a versatile tool to trap and move particles like biological cells in the microscopic range. Such tools currently are used in research applications for investigating cell properties, for sorting of cells, or even for diagnostic applications.
{"title":"Calibration of hologram coefficients in holographic optical tweezers and automized trapping","authors":"S. Zwick, M. Warber, L. He, C. Schaub, T. Haist, W. Osten","doi":"10.1109/CLEOE-EQEC.2009.5192945","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192945","url":null,"abstract":"Optical tweezers are a versatile tool to trap and move particles like biological cells in the microscopic range. Such tools currently are used in research applications for investigating cell properties, for sorting of cells, or even for diagnostic applications.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"136 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":"116332722","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.2009.5196293
O. Mendoza-Yero, G. Mínguez-Vega, E. Tajahuerce, J. Lancis, V. Climent, P. Andrés
Optical filters based on diffractive optical elements (DOE) have received increased attention since the development of the first synthetic spectrum as a tool for correlation spectroscopy [1]. The production of a synthetic spectrum requires the design of a DOE that transforms the spectrum associated with the incident light into the spectrum of interest. Based on this procedure, several approaches have been reported in the literature [1–4]. In general, these configurations employ angular dispersion elements for spectrum tailoring, so they are restricted to working off-axis, and most of them need an extra focusing refractive lens.
{"title":"Compact all-diffractive setup for spectral synthesis with non-uniform illumination","authors":"O. Mendoza-Yero, G. Mínguez-Vega, E. Tajahuerce, J. Lancis, V. Climent, P. Andrés","doi":"10.1109/CLEOE-EQEC.2009.5196293","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5196293","url":null,"abstract":"Optical filters based on diffractive optical elements (DOE) have received increased attention since the development of the first synthetic spectrum as a tool for correlation spectroscopy [1]. The production of a synthetic spectrum requires the design of a DOE that transforms the spectrum associated with the incident light into the spectrum of interest. Based on this procedure, several approaches have been reported in the literature [1–4]. In general, these configurations employ angular dispersion elements for spectrum tailoring, so they are restricted to working off-axis, and most of them need an extra focusing refractive lens.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"80 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":"116476575","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.2009.5191657
B. Chalopin, G. Patera, G. D. de Valcárcel, C. Fabre, N. Treps
Optical parametric oscillators (OPO) have been extensively used in the continuous variable quantum optics community as a resource to produce non-classical states of light, including squeezed states or entangled beams. They have been widely studied, theoretically and experimentally, in the single mode case, and have found many applications to quantum information protocols and high sensitivity optical measurements. However, as the complexity of quantum information protocols increases, the need for multiplexed quantum channels has emerged, which require the use of multimode non-classical states of light.
{"title":"Generation of multimode squeezing and entanglement in the space and frequency domains : A general “supermode” approach","authors":"B. Chalopin, G. Patera, G. D. de Valcárcel, C. Fabre, N. Treps","doi":"10.1109/CLEOE-EQEC.2009.5191657","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5191657","url":null,"abstract":"Optical parametric oscillators (OPO) have been extensively used in the continuous variable quantum optics community as a resource to produce non-classical states of light, including squeezed states or entangled beams. They have been widely studied, theoretically and experimentally, in the single mode case, and have found many applications to quantum information protocols and high sensitivity optical measurements. However, as the complexity of quantum information protocols increases, the need for multiplexed quantum channels has emerged, which require the use of multimode non-classical states of light.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"36 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":"121481807","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.2009.5192299
M. Lukin
We will discuss our work towards controlling light-matter interactions that make use of sub-wavelength localization of optical fields. Our approach combines the ideas of quantum optics with those of electronics and plasmonics. It can be used to create an efficient quantum interface between individual optical emitters and individual surfaces plasmons, to develop novel kinds of nanoscale sensors and to control cold atoms in nanoscale traps.
{"title":"Quantum optics at nanoscales","authors":"M. Lukin","doi":"10.1109/CLEOE-EQEC.2009.5192299","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192299","url":null,"abstract":"We will discuss our work towards controlling light-matter interactions that make use of sub-wavelength localization of optical fields. Our approach combines the ideas of quantum optics with those of electronics and plasmonics. It can be used to create an efficient quantum interface between individual optical emitters and individual surfaces plasmons, to develop novel kinds of nanoscale sensors and to control cold atoms in nanoscale traps.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"120 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":"114010192","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.2009.5192091
M. Geiselmann, T. Utikal, M. Lippitz, H. Giessen
A magnetic mode and an underlying waveguide mode can form a so-called magnetic plasmon polariton. We study its femtosecond dynamics [1, 2], where the magnetic field is confined in the waveguide. We fabricated a magnetic photonic crystal [3] using electron-beam lithography and a lift-off process, consisting of gold cut wire pairs separated by a magnesium fluoride spacer on a HfO2-waveguide (see inset (d)). With the correct grating period we can couple the polaritonic and the photonic system. In order to tune the coupling strength and to tailor the dephasing, we fabricated a sample with varied grating period to shift the magnetic resonance in and out of our laser excitation. The exact resonance of the magnetic photonic crystal with respect to the laser spectra is shown in Fig. 1(a)-(c) (thin red line).
{"title":"Tailoring polaritonic dephasing in magnetic photonic crystals","authors":"M. Geiselmann, T. Utikal, M. Lippitz, H. Giessen","doi":"10.1109/CLEOE-EQEC.2009.5192091","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192091","url":null,"abstract":"A magnetic mode and an underlying waveguide mode can form a so-called magnetic plasmon polariton. We study its femtosecond dynamics [1, 2], where the magnetic field is confined in the waveguide. We fabricated a magnetic photonic crystal [3] using electron-beam lithography and a lift-off process, consisting of gold cut wire pairs separated by a magnesium fluoride spacer on a HfO2-waveguide (see inset (d)). With the correct grating period we can couple the polaritonic and the photonic system. In order to tune the coupling strength and to tailor the dephasing, we fabricated a sample with varied grating period to shift the magnetic resonance in and out of our laser excitation. The exact resonance of the magnetic photonic crystal with respect to the laser spectra is shown in Fig. 1(a)-(c) (thin red line).","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"27 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114014104","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.2009.5196560
Youfang Hu, N. Broderick
The feasibility of building a distributed feedback fibre Raman laser based on a long uniform fibre Bragg grating was suggested by Perlin et al. [1]. However, such a laser requires good grating uniformity along a very long length, e.g. 1m, and has not been investigated experimentally. In this study, we demonstrated an improved design of a DFB fibre Raman laser with an optimised λ/4 phase-shifted grating structure, which enables highly efficient laser operation at low threshold with a relatively short cavity length.
{"title":"Design of λ/4 phase shifted DFB fibre Raman laser","authors":"Youfang Hu, N. Broderick","doi":"10.1109/CLEOE-EQEC.2009.5196560","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5196560","url":null,"abstract":"The feasibility of building a distributed feedback fibre Raman laser based on a long uniform fibre Bragg grating was suggested by Perlin et al. [1]. However, such a laser requires good grating uniformity along a very long length, e.g. 1m, and has not been investigated experimentally. In this study, we demonstrated an improved design of a DFB fibre Raman laser with an optimised λ/4 phase-shifted grating structure, which enables highly efficient laser operation at low threshold with a relatively short cavity length.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"56 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":"114796336","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.2009.5192898
S. Kobtsev, S. Kukarin, Y. Fedotov, S. Smirnov
Super-continuum generation in non-linear optical fibres pumped with ultra-short light pulses (within femtosecond to nanosecond range) is usually accompanied by decay of the pumping pulse into several (or a plurality) of super-continuum pulses with different energies [1–3]. In time domain this corresponds to a super-continuum pulse train where intervals between pulses are of the same order as the pulse duration or longer. When pumped with nanosecond pulses the super-continuum pulses retain their integrity at nanosecond scale, that's why in this case super-continuum pulses can be characterised by such parameters as pulse energy, duration, etc.
{"title":"All-fiber supercontinuum generator with high-energy pulses","authors":"S. Kobtsev, S. Kukarin, Y. Fedotov, S. Smirnov","doi":"10.1109/CLEOE-EQEC.2009.5192898","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192898","url":null,"abstract":"Super-continuum generation in non-linear optical fibres pumped with ultra-short light pulses (within femtosecond to nanosecond range) is usually accompanied by decay of the pumping pulse into several (or a plurality) of super-continuum pulses with different energies [1–3]. In time domain this corresponds to a super-continuum pulse train where intervals between pulses are of the same order as the pulse duration or longer. When pumped with nanosecond pulses the super-continuum pulses retain their integrity at nanosecond scale, that's why in this case super-continuum pulses can be characterised by such parameters as pulse energy, duration, etc.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"213 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":"114845464","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.2009.5196501
V. Troncale, E. Kapon, K. Karlsson
Three-dimensional (3D) quantum confinement in semiconductor quantum dots (QDs) implies valence band mixing, which in turns determines the polarization properties of the emitted photons. However, the valence band structure in QDs has been investigated so far mostly in self-assembled strained dots, in which heavy- and light-hole mixing is weak and the confinement geometry is fixed to a large extent. Here we propose novel schemes for engineering and switching the hole-character and the polarization of the emitted photons in pyramidal QD heterostructures. Valence-band engineering and deterministic control of the hole-character in quantum nanostructures self-formed in inverted pyramids have been reported, both for GaAs/AlGaAs Dot-in-Dot (DiDs) [1] and for AlGaAs Quantum-Dot Molecules (QDMs) [2]. Side-view polarization-resolved photoluminescence spectra clearly demonstrated the switching of the ground state character from light-hole (LH) to heavy-hole (HH) as the geometrical configuration is changed [1]. Here, we propose and theoretically demonstrate dynamic switching of hole-character and polarization induced by applying an electric field on pyramidal DiDs and QDMs (Figs. 1 and 2). Our studies show that it is possible to separately confine the electron state and the hole states such that the holes are confined in thinner low-potential regions, and are hence predominantly of heavy hole character. The electric fields required for such switching are calculated for a variety of DiD and QDM configurations, showing that realistic values of less than 105 V/cm are sufficient for inducing the switching. The fabrication of such structures will be discussed. Such dynamic switching of photon polarization is interesting for various QD emitters such as lasers and single photon sources.
{"title":"Hole character and photon polarization switching in quantum dot-in-dots and Quantum Dot Molecules","authors":"V. Troncale, E. Kapon, K. Karlsson","doi":"10.1109/CLEOE-EQEC.2009.5196501","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5196501","url":null,"abstract":"Three-dimensional (3D) quantum confinement in semiconductor quantum dots (QDs) implies valence band mixing, which in turns determines the polarization properties of the emitted photons. However, the valence band structure in QDs has been investigated so far mostly in self-assembled strained dots, in which heavy- and light-hole mixing is weak and the confinement geometry is fixed to a large extent. Here we propose novel schemes for engineering and switching the hole-character and the polarization of the emitted photons in pyramidal QD heterostructures. Valence-band engineering and deterministic control of the hole-character in quantum nanostructures self-formed in inverted pyramids have been reported, both for GaAs/AlGaAs Dot-in-Dot (DiDs) [1] and for AlGaAs Quantum-Dot Molecules (QDMs) [2]. Side-view polarization-resolved photoluminescence spectra clearly demonstrated the switching of the ground state character from light-hole (LH) to heavy-hole (HH) as the geometrical configuration is changed [1]. Here, we propose and theoretically demonstrate dynamic switching of hole-character and polarization induced by applying an electric field on pyramidal DiDs and QDMs (Figs. 1 and 2). Our studies show that it is possible to separately confine the electron state and the hole states such that the holes are confined in thinner low-potential regions, and are hence predominantly of heavy hole character. The electric fields required for such switching are calculated for a variety of DiD and QDM configurations, showing that realistic values of less than 105 V/cm are sufficient for inducing the switching. The fabrication of such structures will be discussed. Such dynamic switching of photon polarization is interesting for various QD emitters such as lasers and single photon sources.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"56 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":"114849614","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.2009.5192874
Y. Tanaka, K. Furuki, Y. Maeda, T. Omatsu
High intense optical vortex pulses, exhibiting an orbital angular momentum, have potentially to be applied in various fields, such as optical tweezers, laser micro-fabrication, and laser acceleration. Several researchers have successfully demonstrated ways to produce vortex outputs through mode-conversion in an optical fiber, including a stressed optical fiber as well as a hollow fiber. However, they used mostly a passive fiber as well as a continuous-wave laser. In this paper, we present the production of intense pico-second vortex pulses by selectively coupling a pico-second master laser into LP11 modes in a stressed large mode-area fiber amplifier with an off-axis fiber injection method, for the first time.
{"title":"Pico-second vortex output from a large-mode area fiber amplifier","authors":"Y. Tanaka, K. Furuki, Y. Maeda, T. Omatsu","doi":"10.1109/CLEOE-EQEC.2009.5192874","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192874","url":null,"abstract":"High intense optical vortex pulses, exhibiting an orbital angular momentum, have potentially to be applied in various fields, such as optical tweezers, laser micro-fabrication, and laser acceleration. Several researchers have successfully demonstrated ways to produce vortex outputs through mode-conversion in an optical fiber, including a stressed optical fiber as well as a hollow fiber. However, they used mostly a passive fiber as well as a continuous-wave laser. In this paper, we present the production of intense pico-second vortex pulses by selectively coupling a pico-second master laser into LP11 modes in a stressed large mode-area fiber amplifier with an off-axis fiber injection method, for the first time.","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":"124476565","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.2009.5192296
T. Dascălu, N. Pavel, N. Vasile
Compared with a conventional spark-ignition system, a laser-induced ignition of air-fuel mixtures in internal combustion engines presents many advantages, such as a higher probability to ignite leaner mixtures, no erosion effects, increase of engine efficiency, or shorter combustion time [1]. However, a laser used for ignition has to withstand hard-working conditions, such as high thermal and mechanical stress, or vibrations. A tough condition is imposed by the temperature, which should typically range from −40°C to 150°C. In this work we investigated the performances of a diode-pumped Nd:YAG laser passively Q-switched by Cr4+:YAG saturable absorber (SA) crystal, which is commonly used in engine ignition [2], for temperatures up to 150°C.
{"title":"Operation at high temperature of a diode-pumped passively Q-switched Nd:YAG/Cr4+:YAG laser","authors":"T. Dascălu, N. Pavel, N. Vasile","doi":"10.1109/CLEOE-EQEC.2009.5192296","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2009.5192296","url":null,"abstract":"Compared with a conventional spark-ignition system, a laser-induced ignition of air-fuel mixtures in internal combustion engines presents many advantages, such as a higher probability to ignite leaner mixtures, no erosion effects, increase of engine efficiency, or shorter combustion time [1]. However, a laser used for ignition has to withstand hard-working conditions, such as high thermal and mechanical stress, or vibrations. A tough condition is imposed by the temperature, which should typically range from −40°C to 150°C. In this work we investigated the performances of a diode-pumped Nd:YAG laser passively Q-switched by Cr4+:YAG saturable absorber (SA) crystal, which is commonly used in engine ignition [2], for temperatures up to 150°C.","PeriodicalId":346720,"journal":{"name":"CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference","volume":"4 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":"124033697","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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