Pub Date : 2000-09-10DOI: 10.1109/IQEC.2000.908073
V. Shatokhin, S. Kilm
Spectral detection of resonance fluorescence allows to regard atomic spectra as a sequence of elementary scattering events accompanied by emissions of photons with different frequencies. What the reduced atomic state (RAS) is after such a photon detection represents fundamental interest and appears important in understanding some correlation experiments. We report about derivation of analytic expression for the RAS for the important particular case of the well separated spectral lines of the resonance fluorescence spectrum.
{"title":"Atomic inversion after a photon detection","authors":"V. Shatokhin, S. Kilm","doi":"10.1109/IQEC.2000.908073","DOIUrl":"https://doi.org/10.1109/IQEC.2000.908073","url":null,"abstract":"Spectral detection of resonance fluorescence allows to regard atomic spectra as a sequence of elementary scattering events accompanied by emissions of photons with different frequencies. What the reduced atomic state (RAS) is after such a photon detection represents fundamental interest and appears important in understanding some correlation experiments. We report about derivation of analytic expression for the RAS for the important particular case of the well separated spectral lines of the resonance fluorescence spectrum.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115781035","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 : 2000-09-10DOI: 10.1109/IQEC.2000.908019
W. Krolikowski, B. Luther-Davies, D. Edmundson, O. Bang, A. Kujawski
We consider the phenomenological model of the nonlocal Kerr-type nonlinear medium. We obtain the nonlinear Schroedinger equation describing propagation of the one-dimensional optical beam in a weakly nonlinear medium. It turns out that this nonlinear equation can be exactly solved for both focusing and defocusing nonlinearity. In this way one can obtain the intensity profile of bright and dark solitons as a function of the nonlocality parameter. An important aspect of any soliton solution is its stability. Using the well known stability criteria developed for 1D solitons, we found that bright as well as dark spatial solitons in weakly nonlocal nonlinear medium are stable. We confirmed this result by numerical simulation of the propagation equation using exact soliton solutions as initial condition. Solitons propagate in stable fashion over a distances of many diffraction lengths. We also studied collisions of these solitons. We found that, for large intersecting angle, the collision is basically elastic. However, for small angle (long interaction) nonlocal solitons collide inelastically, in analogy to solitons of other nonintegrable models. An example of inelastic collision of two identical nonlocal dark solitons is shown.
{"title":"Bright and dark spatial solitons in a nonlocal Kerr-like medium","authors":"W. Krolikowski, B. Luther-Davies, D. Edmundson, O. Bang, A. Kujawski","doi":"10.1109/IQEC.2000.908019","DOIUrl":"https://doi.org/10.1109/IQEC.2000.908019","url":null,"abstract":"We consider the phenomenological model of the nonlocal Kerr-type nonlinear medium. We obtain the nonlinear Schroedinger equation describing propagation of the one-dimensional optical beam in a weakly nonlinear medium. It turns out that this nonlinear equation can be exactly solved for both focusing and defocusing nonlinearity. In this way one can obtain the intensity profile of bright and dark solitons as a function of the nonlocality parameter. An important aspect of any soliton solution is its stability. Using the well known stability criteria developed for 1D solitons, we found that bright as well as dark spatial solitons in weakly nonlocal nonlinear medium are stable. We confirmed this result by numerical simulation of the propagation equation using exact soliton solutions as initial condition. Solitons propagate in stable fashion over a distances of many diffraction lengths. We also studied collisions of these solitons. We found that, for large intersecting angle, the collision is basically elastic. However, for small angle (long interaction) nonlocal solitons collide inelastically, in analogy to solitons of other nonintegrable models. An example of inelastic collision of two identical nonlocal dark solitons is shown.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"657 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115832493","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 : 2000-09-10DOI: 10.1109/IQEC.2000.907938
H. Perrin, B. Mercier, M. Gorlicki, M. Ducloy, J. Keller, V. Lorent
Summary form only given. We present a new mechanism for reaching quantum degeneracy of a 2D bosonic atomic gas. We use the dipole force created by two evanescent waves of different colors to confine /sup 87/Rb atoms in a quasi 2D geometry. The Morse like resulting potential has a depth on the order of 100 /spl mu/K. We also present a loading mechanism for this trap, taking advantage of the potential profiles of different Zeeman sublevels.
{"title":"Towards a 2D degenerate quantum gas","authors":"H. Perrin, B. Mercier, M. Gorlicki, M. Ducloy, J. Keller, V. Lorent","doi":"10.1109/IQEC.2000.907938","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907938","url":null,"abstract":"Summary form only given. We present a new mechanism for reaching quantum degeneracy of a 2D bosonic atomic gas. We use the dipole force created by two evanescent waves of different colors to confine /sup 87/Rb atoms in a quasi 2D geometry. The Morse like resulting potential has a depth on the order of 100 /spl mu/K. We also present a loading mechanism for this trap, taking advantage of the potential profiles of different Zeeman sublevels.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"573 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124698294","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 : 2000-09-10DOI: 10.1109/IQEC.2000.907834
A. Piskarskas, V. Smilgevieius, A. Stabinis
We re-examine and generalize the theory and discuss the experimental results on noncollinear parametric conversion of coherent and incoherent conical beams in nonlinear crystals. The results relevant to the problem of cumulative pump action and output pattern formation in the OPO and OPG are pointed out. The theoretical model is based on the noncollinear phase-matching of three coherent conical beams, which is a starting point to find the appropriate conditions needed for cumulative action of an incoherent conical pump beam. The experimental results cover the OPO and OPG based on a KTP crystal pumped by coherent and incoherent conical beams at 532 nm.
{"title":"Cumulative phenomena in parametric frequency conversion of conical beam","authors":"A. Piskarskas, V. Smilgevieius, A. Stabinis","doi":"10.1109/IQEC.2000.907834","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907834","url":null,"abstract":"We re-examine and generalize the theory and discuss the experimental results on noncollinear parametric conversion of coherent and incoherent conical beams in nonlinear crystals. The results relevant to the problem of cumulative pump action and output pattern formation in the OPO and OPG are pointed out. The theoretical model is based on the noncollinear phase-matching of three coherent conical beams, which is a starting point to find the appropriate conditions needed for cumulative action of an incoherent conical pump beam. The experimental results cover the OPO and OPG based on a KTP crystal pumped by coherent and incoherent conical beams at 532 nm.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132475404","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 : 2000-09-10DOI: 10.1109/IQEC.2000.907957
H. Ward, M. Taki, P. Glorieux
Summary form only given. We study the convective/absolute nature of spatial-temporal instabilities in optical parametric oscillators (OPO's) with negative detuning in presence of diffraction and walk-off effects. The asymptotic response of the signal and idler fields to a localized 2D perturbation of the transversal plane is evaluated. Presence of walk-off breaks the rotational symmetry: the system, at the absolute instability threshold, selects travelling waves propagating in the walk-off direction among an infinity of unstable spatial-temporal modes. We also show that in OPO's with negative detuning, unlike the case of positive detuning, walk-off selects one mode, shrinks the region of convective instability, and may even suppress the convective/absolute transition. In the framework of coupled complex Ginzburg-Landau amplitude equations, the stability of nonlinear states is investigated, and the convective/absolute nature of secondary instabilities is determined.
{"title":"Nonlinear front competition and secondary absolute instabilities in optical parametric oscillators","authors":"H. Ward, M. Taki, P. Glorieux","doi":"10.1109/IQEC.2000.907957","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907957","url":null,"abstract":"Summary form only given. We study the convective/absolute nature of spatial-temporal instabilities in optical parametric oscillators (OPO's) with negative detuning in presence of diffraction and walk-off effects. The asymptotic response of the signal and idler fields to a localized 2D perturbation of the transversal plane is evaluated. Presence of walk-off breaks the rotational symmetry: the system, at the absolute instability threshold, selects travelling waves propagating in the walk-off direction among an infinity of unstable spatial-temporal modes. We also show that in OPO's with negative detuning, unlike the case of positive detuning, walk-off selects one mode, shrinks the region of convective instability, and may even suppress the convective/absolute transition. In the framework of coupled complex Ginzburg-Landau amplitude equations, the stability of nonlinear states is investigated, and the convective/absolute nature of secondary instabilities is determined.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"69 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129139257","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 : 2000-09-10DOI: 10.1109/IQEC.2000.908083
M. S. Kim, Jinhyoung Lee
Summary form only given. An unknown continuous-variable state can he teleported by use of the two-mode squeezed state as the quantum channel. If the quantum channel is maximally squeezed (100% squeezing), the unknown state will be perfectly reproduced at a remote place. However the assumption of the maximally squeezed quantum channel is unphysical as it means the infinite average photon number of the channel state. Moreover, the interaction of the channel state with the environment degrades the entanglement and purity of the channel. We are interested in how the nonclassical features of the unknown state is revived by quantum teleportation in the real world. It is obvious that a nonclassical nature in the unknown state can be lost during the teleportation even when the channel is entangled unless it is maximally entangled Is it also obvious that any nonclassical feature, cannot be teleported by a classical correlated channel? We find the relation between the entanglement of the channel and teleportation of nonclassical nature in the unknown state.
{"title":"Nonclassicality and fidelity for quantum teleportation of continuous-variable states","authors":"M. S. Kim, Jinhyoung Lee","doi":"10.1109/IQEC.2000.908083","DOIUrl":"https://doi.org/10.1109/IQEC.2000.908083","url":null,"abstract":"Summary form only given. An unknown continuous-variable state can he teleported by use of the two-mode squeezed state as the quantum channel. If the quantum channel is maximally squeezed (100% squeezing), the unknown state will be perfectly reproduced at a remote place. However the assumption of the maximally squeezed quantum channel is unphysical as it means the infinite average photon number of the channel state. Moreover, the interaction of the channel state with the environment degrades the entanglement and purity of the channel. We are interested in how the nonclassical features of the unknown state is revived by quantum teleportation in the real world. It is obvious that a nonclassical nature in the unknown state can be lost during the teleportation even when the channel is entangled unless it is maximally entangled Is it also obvious that any nonclassical feature, cannot be teleported by a classical correlated channel? We find the relation between the entanglement of the channel and teleportation of nonclassical nature in the unknown state.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129099641","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 : 2000-09-10DOI: 10.1109/IQEC.2000.907873
M. Nagai, M. Ashida, R. Shimano, M. Kuwata-Gonokami
Summary form only given. Temperature in direct-gap semiconductor show collective quantum mechanical effects such as the formation of electron-hole liquid and exciton condensation. In the usual band to band excitation, the initial temperature of the carriers remains high within their lifetime. However, creating electron-hole pairs via exciton Mott transition can a good system to realize such a transition, because of its large (213 meV) is Z/sub 3/ exciton binding energy. Recently we have reported on the observation of broad band emission at 100 meV below the exciton band for resonant exciton excitation in CuCl. We perform pump probe measurements in the mid-infrared region in order to understand the origin of the emission band. If high density excitons form plasma, change in reflectivity, increase below plasma frequency and decreases above plasma frequency.
{"title":"Observation of electron-hole plasma via exciton Mott transition in CuCl by mid-infrared pump probe spectroscopy","authors":"M. Nagai, M. Ashida, R. Shimano, M. Kuwata-Gonokami","doi":"10.1109/IQEC.2000.907873","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907873","url":null,"abstract":"Summary form only given. Temperature in direct-gap semiconductor show collective quantum mechanical effects such as the formation of electron-hole liquid and exciton condensation. In the usual band to band excitation, the initial temperature of the carriers remains high within their lifetime. However, creating electron-hole pairs via exciton Mott transition can a good system to realize such a transition, because of its large (213 meV) is Z/sub 3/ exciton binding energy. Recently we have reported on the observation of broad band emission at 100 meV below the exciton band for resonant exciton excitation in CuCl. We perform pump probe measurements in the mid-infrared region in order to understand the origin of the emission band. If high density excitons form plasma, change in reflectivity, increase below plasma frequency and decreases above plasma frequency.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134351652","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 : 2000-09-10DOI: 10.1109/IQEC.2000.907823
V. Roy, M. Piché, F. Babin
Summary form only given. Fiber ring lasers are often oscillating on a large number of longitudinal modes. For some applications it is important to know how the number of modes depends upon the operation parameters of the laser. In this paper we show that, over a large range of values of the intracavity power, the dominant broadening mechanism is the nonlinear phase modulation. The 3-dB linewidth of a wide-band filter-tunable multimode erbium-doped fiber ring laser has been measured as a function of circulating laser power by means of an optical spectrum analyzer and a scanning Fabry-Perot interferometer. The active laser material is a 16-meter long erbium-doped fiber spliced at each end to a passive fiber loop.
{"title":"Nonlinear phase modulation as a broadening mechanism in a multimode erbium-doped fiber ring laser","authors":"V. Roy, M. Piché, F. Babin","doi":"10.1109/IQEC.2000.907823","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907823","url":null,"abstract":"Summary form only given. Fiber ring lasers are often oscillating on a large number of longitudinal modes. For some applications it is important to know how the number of modes depends upon the operation parameters of the laser. In this paper we show that, over a large range of values of the intracavity power, the dominant broadening mechanism is the nonlinear phase modulation. The 3-dB linewidth of a wide-band filter-tunable multimode erbium-doped fiber ring laser has been measured as a function of circulating laser power by means of an optical spectrum analyzer and a scanning Fabry-Perot interferometer. The active laser material is a 16-meter long erbium-doped fiber spliced at each end to a passive fiber loop.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131518771","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 : 2000-09-10DOI: 10.1109/IQEC.2000.907890
É. Lacot, R. Day, F. Stoeckel
Summary form only given. The dynamics of a class-B laser is very sensitive to frequency shifted optical feedback. We have used this property, to develop a new imaging system where the laser source acts both as a reference beam (local oscillator), an optical amplifier, a spatial filter (due to cavity mode matching) and as a possible detector.
{"title":"Detection of weak optical feedback by linear and nonlinear laser dynamics","authors":"É. Lacot, R. Day, F. Stoeckel","doi":"10.1109/IQEC.2000.907890","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907890","url":null,"abstract":"Summary form only given. The dynamics of a class-B laser is very sensitive to frequency shifted optical feedback. We have used this property, to develop a new imaging system where the laser source acts both as a reference beam (local oscillator), an optical amplifier, a spatial filter (due to cavity mode matching) and as a possible detector.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133665962","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 : 2000-09-10DOI: 10.1109/IQEC.2000.907891
S. Hwong, J. Chern, T. Lim, K. Otsuka
Summary form only given. It has been believed that class-B lasers, in which polarization dynamics can be adiabatically eliminated, do not exhibit dynamical instability unless additional degrees of freedom are introduced in the form of modulations, saturable absorbers, light injections, external feedback, and so forth. Recently, however, self-induced instability has been demonstrated in multimode class-B lasers resulting from their inherent nonlinearities. In this paper, we demonstrate large-amplitude chaotic relaxation oscillations in a laser-diode-pumped Nd:YAG laser operating in a double-transition oscillation scheme.
{"title":"Dynamical instability in a laser-diode-pumped multitransition-oscillation Nd:YAG laser","authors":"S. Hwong, J. Chern, T. Lim, K. Otsuka","doi":"10.1109/IQEC.2000.907891","DOIUrl":"https://doi.org/10.1109/IQEC.2000.907891","url":null,"abstract":"Summary form only given. It has been believed that class-B lasers, in which polarization dynamics can be adiabatically eliminated, do not exhibit dynamical instability unless additional degrees of freedom are introduced in the form of modulations, saturable absorbers, light injections, external feedback, and so forth. Recently, however, self-induced instability has been demonstrated in multimode class-B lasers resulting from their inherent nonlinearities. In this paper, we demonstrate large-amplitude chaotic relaxation oscillations in a laser-diode-pumped Nd:YAG laser operating in a double-transition oscillation scheme.","PeriodicalId":267372,"journal":{"name":"Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133266092","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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