Pub Date : 2011-05-22DOI: 10.1109/CLEOE.2011.5943013
A. Mathis, M. Jacquot, F. Courvoisier, L. Froehly, J. Dudley
Airy beams are a solution to the paraxial wave equation with nondiffracting properties [1]. These beams were only recently experimentally observed by Siviloglou et al [2]. Airy beams generate a growing interest since they remain focused during the propagation, exhibit properties of self-healing and their trajectory is parabolic along the propagation axis. At present, applications of Airy beams are dedicated to trapping and filamentation. For applications to extreme nonlinear optics and material structuring, nondiffracting beams have key benefits over gaussian beams [3].
{"title":"Studies and realization of an experimental set-up for micro Airy beams generation","authors":"A. Mathis, M. Jacquot, F. Courvoisier, L. Froehly, J. Dudley","doi":"10.1109/CLEOE.2011.5943013","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943013","url":null,"abstract":"Airy beams are a solution to the paraxial wave equation with nondiffracting properties [1]. These beams were only recently experimentally observed by Siviloglou et al [2]. Airy beams generate a growing interest since they remain focused during the propagation, exhibit properties of self-healing and their trajectory is parabolic along the propagation axis. At present, applications of Airy beams are dedicated to trapping and filamentation. For applications to extreme nonlinear optics and material structuring, nondiffracting beams have key benefits over gaussian beams [3].","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82964267","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5943486
R. Driben, F. Mitschke, N. Zhavoronkov
We have studied experimentally [1] and numerically the dynamics of negatively prechirped pulses with different input peak powers in PCF with resultant spectral broadening and supercontinuum generation. After the initial compression stage of a few cm, the input pulse, as it corresponds to a high order soliton, undergoes fission into multiple fundamental solitons [2] accompanied by emission of non-soliton radiation [3]. Spectra of these solitons are shifted toward longer wavelengths by Raman induced frequency shift [4] (RIF) producing spectral broadening at the red edge of the spectrum. We show that the radiation emitted by stonger solitons can be absorbed by trailing solitons, altering their path. This can lead to additional soliton quasi-elastic or quasi-plastic collisions and to an enhancement of the power in certain spectral regions of the generated supercontinuum or, even more interestingly, in the generation of new frequency components. The process of interaction of solitons with dispersive waves is extremely sensitive to manageable input pulse parameters. For example small variations in initial chirp parameter can result in variations of the collision mode between solitons from a quasi-elastic to a quasi-plastic [5]. Fig.1 demonstrates an example of a plastic collision at C = −1.16 when the colliding solitons combine into one giant solitary wave which keeps propagating at large group velocity. In the process a strong spectral band is generated, which extends the SC spectrum beyond 1500 nm.
{"title":"Management of interactions between Raman induced solitons and dispersive waves in photonic crystal fibers at the advanced stage of supercontinuum generation","authors":"R. Driben, F. Mitschke, N. Zhavoronkov","doi":"10.1109/CLEOE.2011.5943486","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943486","url":null,"abstract":"We have studied experimentally [1] and numerically the dynamics of negatively prechirped pulses with different input peak powers in PCF with resultant spectral broadening and supercontinuum generation. After the initial compression stage of a few cm, the input pulse, as it corresponds to a high order soliton, undergoes fission into multiple fundamental solitons [2] accompanied by emission of non-soliton radiation [3]. Spectra of these solitons are shifted toward longer wavelengths by Raman induced frequency shift [4] (RIF) producing spectral broadening at the red edge of the spectrum. We show that the radiation emitted by stonger solitons can be absorbed by trailing solitons, altering their path. This can lead to additional soliton quasi-elastic or quasi-plastic collisions and to an enhancement of the power in certain spectral regions of the generated supercontinuum or, even more interestingly, in the generation of new frequency components. The process of interaction of solitons with dispersive waves is extremely sensitive to manageable input pulse parameters. For example small variations in initial chirp parameter can result in variations of the collision mode between solitons from a quasi-elastic to a quasi-plastic [5]. Fig.1 demonstrates an example of a plastic collision at C = −1.16 when the colliding solitons combine into one giant solitary wave which keeps propagating at large group velocity. In the process a strong spectral band is generated, which extends the SC spectrum beyond 1500 nm.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82781605","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5943284
D. Tulli, D. Janner, V. Pruneri
Optical high-voltage sensors have outstanding advantages in terms of isolation and immunity to electromagnetic interference. So far, several configurations have been proposed, mostly based on integrated Mach-Zehnder interferometers [1] or polarization/phase rotation in piezo-electric crystal [2]. While the first scheme requires initial electrical bias to compensate for the phase mismatch between the two arms, the second one requires interrogation or phase noise reduction systems that are expensive to implement. Near cut-off optical waveguide devices have been already reported in LiNbO3. In particular, the use of waveguides at cut-off was proposed for modulation in the field of optical communications [3,4] and sensing [5]. We present a novel integrated optical high voltage sensor based on a Z-cut LiNbO3 which operates without any metallic parts. The proposed device is sketched in Fig. 1 (left). An annealed proton exchange (APE) waveguide near cut-off is fabricated in Z-cut LiNbO3 and centered in a domain inverted region. The application of an external electric field parallel to the z axis of the device produces a refractive index change Δn± between positive and negative domains given by ne3·r33·E, where E is the intensity of the external electric field along the z-axis, ne=2.14 and r33=30.8 pm/V are the refractive index and the electro-optic coefficient along the z-axis, respectively. As a consequence the optical mode will broaden so that, after a sufficient propagation length, a loss is produced due to a mode-profile mismatch of the guided modes between active and passive regions.
{"title":"All-optical electric field sensor in domain inverted LiNbO3 for harsh environment","authors":"D. Tulli, D. Janner, V. Pruneri","doi":"10.1109/CLEOE.2011.5943284","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943284","url":null,"abstract":"Optical high-voltage sensors have outstanding advantages in terms of isolation and immunity to electromagnetic interference. So far, several configurations have been proposed, mostly based on integrated Mach-Zehnder interferometers [1] or polarization/phase rotation in piezo-electric crystal [2]. While the first scheme requires initial electrical bias to compensate for the phase mismatch between the two arms, the second one requires interrogation or phase noise reduction systems that are expensive to implement. Near cut-off optical waveguide devices have been already reported in LiNbO3. In particular, the use of waveguides at cut-off was proposed for modulation in the field of optical communications [3,4] and sensing [5]. We present a novel integrated optical high voltage sensor based on a Z-cut LiNbO3 which operates without any metallic parts. The proposed device is sketched in Fig. 1 (left). An annealed proton exchange (APE) waveguide near cut-off is fabricated in Z-cut LiNbO3 and centered in a domain inverted region. The application of an external electric field parallel to the z axis of the device produces a refractive index change Δn± between positive and negative domains given by ne3·r33·E, where E is the intensity of the external electric field along the z-axis, ne=2.14 and r33=30.8 pm/V are the refractive index and the electro-optic coefficient along the z-axis, respectively. As a consequence the optical mode will broaden so that, after a sufficient propagation length, a loss is produced due to a mode-profile mismatch of the guided modes between active and passive regions.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82841874","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5943515
A. Ruehl, Michael J. Martin, K. Cossel, Lisheng Chen, C. Benko, H. McKay, B. Thomas, L. Dong, M. Fermann, J. Dudley, I. Hartl, Jun Ye
Highly coherent optical frequency combs have applications ranging from broadband spectroscopy with high sensitivity and accuracy [1], to the spectral dissemination of optical frequency references [2], where coherently linking the visible spectrum to the telecom band is important for the development of novel ultra-stable lasers in the 1.5 µm spectral region as well as long-haul optical carrier transfer [3]. In this contribution, we report on coherent transfer over more than one spectral octave with a Yb-fiber frequency comb. This represents the largest spectral gap directly spanned between two ultra-stable lasers by a frequency comb to date.
{"title":"Coherent transfer over 1.1 spectral octave with a fiber frequency comb","authors":"A. Ruehl, Michael J. Martin, K. Cossel, Lisheng Chen, C. Benko, H. McKay, B. Thomas, L. Dong, M. Fermann, J. Dudley, I. Hartl, Jun Ye","doi":"10.1109/CLEOE.2011.5943515","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943515","url":null,"abstract":"Highly coherent optical frequency combs have applications ranging from broadband spectroscopy with high sensitivity and accuracy [1], to the spectral dissemination of optical frequency references [2], where coherently linking the visible spectrum to the telecom band is important for the development of novel ultra-stable lasers in the 1.5 µm spectral region as well as long-haul optical carrier transfer [3]. In this contribution, we report on coherent transfer over more than one spectral octave with a Yb-fiber frequency comb. This represents the largest spectral gap directly spanned between two ultra-stable lasers by a frequency comb to date.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82936889","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5943059
George Y. Chen, Timothy Lee, Yongmin Jung, Mohammad Belal, Gilberto Brambilla, Neil G. R. Broderick, T. Newson
Recently, there has been great interest in the use of microfiber resonators as optical sensors [1] and micro-optical devices [2] due to their compactness, robustness, high Q-factor and low-loss. In particular, temperature sensors exploiting the thermally-induced resonance wavelength shift have potentially high sensitivity, fine resolution and large operating temperature range. Here, we report on the theoretical and experimental analysis of such a sensor based on a microcoil resonator (MCR).
{"title":"Investigation of thermal effects on embedded microcoil resonators","authors":"George Y. Chen, Timothy Lee, Yongmin Jung, Mohammad Belal, Gilberto Brambilla, Neil G. R. Broderick, T. Newson","doi":"10.1109/CLEOE.2011.5943059","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943059","url":null,"abstract":"Recently, there has been great interest in the use of microfiber resonators as optical sensors [1] and micro-optical devices [2] due to their compactness, robustness, high Q-factor and low-loss. In particular, temperature sensors exploiting the thermally-induced resonance wavelength shift have potentially high sensitivity, fine resolution and large operating temperature range. Here, we report on the theoretical and experimental analysis of such a sensor based on a microcoil resonator (MCR).","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88893385","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5943677
N. Cvetojevic, N. Jovanovic, J. Bland-Hawthorn, R. Haynes, J. Lawrence
The next generation of major ground-based optical and near-infrared astronomical telescopes are planned to have aperture sizes from 25–42 meters in diameter, making them substantially larger than existing telescopes. This has a major impact on seeing limited spectroscopic instrumentation, as the size of the instrument grows in proportion to the telescope aperture for traditional designs and more importantly, the cost of the instrument increases with the telescope aperture squared, or faster [1]. This unsustainable trend has necessitated a miniaturization of devices for astronomy, with integrated photonics showing great promise. Particularly of interest is the integrated photonic spectrograph (IPS) [1,2].
{"title":"Arrayed waveguide gratings for astronomy with multiple offaxis fibre launch","authors":"N. Cvetojevic, N. Jovanovic, J. Bland-Hawthorn, R. Haynes, J. Lawrence","doi":"10.1109/CLEOE.2011.5943677","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943677","url":null,"abstract":"The next generation of major ground-based optical and near-infrared astronomical telescopes are planned to have aperture sizes from 25–42 meters in diameter, making them substantially larger than existing telescopes. This has a major impact on seeing limited spectroscopic instrumentation, as the size of the instrument grows in proportion to the telescope aperture for traditional designs and more importantly, the cost of the instrument increases with the telescope aperture squared, or faster [1]. This unsustainable trend has necessitated a miniaturization of devices for astronomy, with integrated photonics showing great promise. Particularly of interest is the integrated photonic spectrograph (IPS) [1,2].","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89198804","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5942620
T. Fuhrer, T. Walther
We present a novel technique for external cavity diode lasers (ECDL) in Littrow configuration which guarantees large mode-hop free tuning ranges combined with the ability to adjust and control the linewidth. These features are favorable in many applications. For tuning an ECDL it is required that the internal, i.e. the diode itself, and the external cavities, i.e. the resonator formed by the facet of the diode and the grating, are simultaneously in resonance. Our method implements a closed loop control in order to sustain the resonance condition of the ECDL. The error signal for the control loop is given by the state of polarization (SOP) of the laser light. By placing a quarter-wave-plate into the external cavity, cf. Fig. 1a, the information about the resonance of the ECDL is transferred to the SOP.
{"title":"Tuning wavelength and linewidth of an external cavity diode laser using an active control scheme based on polarization spectroscopy","authors":"T. Fuhrer, T. Walther","doi":"10.1109/CLEOE.2011.5942620","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942620","url":null,"abstract":"We present a novel technique for external cavity diode lasers (ECDL) in Littrow configuration which guarantees large mode-hop free tuning ranges combined with the ability to adjust and control the linewidth. These features are favorable in many applications. For tuning an ECDL it is required that the internal, i.e. the diode itself, and the external cavities, i.e. the resonator formed by the facet of the diode and the grating, are simultaneously in resonance. Our method implements a closed loop control in order to sustain the resonance condition of the ECDL. The error signal for the control loop is given by the state of polarization (SOP) of the laser light. By placing a quarter-wave-plate into the external cavity, cf. Fig. 1a, the information about the resonance of the ECDL is transferred to the SOP.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91506586","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5943641
A. Marini, D. Skryabin, B. Malomed
Surface Plasmon Polaritons (SPPs) provide one of the favored approaches to realization of on-chip photonic devices, novel imaging schemes and are a well established tool in sensing applications. While SPPs are exponentially localized in the direction perpendicular to the metal-dielectric interface by the natural boundary conditions, one should take a special care about suppression of their in-plane diffraction. An interesting alternative to various geometrical methods providing lateral confinement of SPPs is to use the concept of spatial solitons, where diffraction is suppressed by the nonlinearity induced focusing, see, e.g., [1]. Further, the spatial soliton concept can be extended by complementing the diffraction vs nonlinearity balance with the gain vs loss balance, thus completely solving the problem of the soliton decay due to linear absorption. Towards this aim, cubic Ginzburg-Landau equation has been derived for the SPPs at the boundary with active dielectric [2]. However, SPP solitons reported in the above work demonstrate substantial instabilities [2].
{"title":"Stable spatial plasmon solitons in IMI waveguides with gain and loss","authors":"A. Marini, D. Skryabin, B. Malomed","doi":"10.1109/CLEOE.2011.5943641","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943641","url":null,"abstract":"Surface Plasmon Polaritons (SPPs) provide one of the favored approaches to realization of on-chip photonic devices, novel imaging schemes and are a well established tool in sensing applications. While SPPs are exponentially localized in the direction perpendicular to the metal-dielectric interface by the natural boundary conditions, one should take a special care about suppression of their in-plane diffraction. An interesting alternative to various geometrical methods providing lateral confinement of SPPs is to use the concept of spatial solitons, where diffraction is suppressed by the nonlinearity induced focusing, see, e.g., [1]. Further, the spatial soliton concept can be extended by complementing the diffraction vs nonlinearity balance with the gain vs loss balance, thus completely solving the problem of the soliton decay due to linear absorption. Towards this aim, cubic Ginzburg-Landau equation has been derived for the SPPs at the boundary with active dielectric [2]. However, SPP solitons reported in the above work demonstrate substantial instabilities [2].","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90486226","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5942697
Masato Suzuki, Y. Toda, R. Morita
Having a helical wavefront, a Laguerre-Gaussian (LG) mode or optical vortex is one of the modes of paraxial solutions to wave equation. The optical vortex has unique properties. The beam has a phase singularity on its center, which shows a dark part on its center of intensity profile, and carries an orbital angular momentum of light well defined by the topological charge ℓ [1]. These characteristics recently attracted much attention. For more versatile applications, high power optical-vortex pulses are desired. Typically, optical vortices are generated by using a spiral plate [2], a spatial light modulator (SLM) [3], a photonic-crystal axially-symmetric polarizer/waveplate [4] or a uniaxial crystal [5]. Among them, the most flexible method is by SLM. However, this method using SLM is power-limited owing to its damage threshold. Hence, as an alternative to generate high power optical-vortex pulses, we choose the method using a uniaxial crystal, which is rather flexible. In this scheme, the nonlinear effects have not been clarified in detail. In the present paper, we investigate nonlinear effects on optical-vortex pulse generation through the spin-orbit interaction and its propagation in an anisotropic crystal.
{"title":"Nonlinear propagation effects on high-power optical-vortex pulses in anisotropic crystals","authors":"Masato Suzuki, Y. Toda, R. Morita","doi":"10.1109/CLEOE.2011.5942697","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5942697","url":null,"abstract":"Having a helical wavefront, a Laguerre-Gaussian (LG) mode or optical vortex is one of the modes of paraxial solutions to wave equation. The optical vortex has unique properties. The beam has a phase singularity on its center, which shows a dark part on its center of intensity profile, and carries an orbital angular momentum of light well defined by the topological charge ℓ [1]. These characteristics recently attracted much attention. For more versatile applications, high power optical-vortex pulses are desired. Typically, optical vortices are generated by using a spiral plate [2], a spatial light modulator (SLM) [3], a photonic-crystal axially-symmetric polarizer/waveplate [4] or a uniaxial crystal [5]. Among them, the most flexible method is by SLM. However, this method using SLM is power-limited owing to its damage threshold. Hence, as an alternative to generate high power optical-vortex pulses, we choose the method using a uniaxial crystal, which is rather flexible. In this scheme, the nonlinear effects have not been clarified in detail. In the present paper, we investigate nonlinear effects on optical-vortex pulse generation through the spin-orbit interaction and its propagation in an anisotropic crystal.","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88847720","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 : 2011-05-22DOI: 10.1109/CLEOE.2011.5943291
O. Gorceix, B. Pasquiou, G. Bismut, E. Maréchal, P. Pedri, L. Vernac, B. Laburthe-Tolra
Dipole-dipole interactions are long-ranged and anisotropic. They induce a coupling between spin and angular momentum degrees of freedom yielding new interesting physics in the field of dilute quantum gases. We have thoroughly studied dipolar relaxation DR processes in a chromium BEC transferred into an excited magnetic m = +3 sublevel and loaded in 1D and 2D optical lattices [1, 2, 3]. We demonstrate and quantify how the confinement of a quantum gas in optical lattices deeply modifies the DR processes. In particular, we show that DR is strongly inhibited at low magnetic fields when the released energy becomes smaller than the vibrational quantum of energy at the bottom of the lattice wells. We show that interband transitions are induced above the corresponding threshold and that metastability of the “excited state BEC” is reached below the 2D threshold [1].
{"title":"Spin-3 dynamics study in a chromium Bose-Einstein Condensate","authors":"O. Gorceix, B. Pasquiou, G. Bismut, E. Maréchal, P. Pedri, L. Vernac, B. Laburthe-Tolra","doi":"10.1109/CLEOE.2011.5943291","DOIUrl":"https://doi.org/10.1109/CLEOE.2011.5943291","url":null,"abstract":"Dipole-dipole interactions are long-ranged and anisotropic. They induce a coupling between spin and angular momentum degrees of freedom yielding new interesting physics in the field of dilute quantum gases. We have thoroughly studied dipolar relaxation DR processes in a chromium BEC transferred into an excited magnetic m = +3 sublevel and loaded in 1D and 2D optical lattices [1, 2, 3]. We demonstrate and quantify how the confinement of a quantum gas in optical lattices deeply modifies the DR processes. In particular, we show that DR is strongly inhibited at low magnetic fields when the released energy becomes smaller than the vibrational quantum of energy at the bottom of the lattice wells. We show that interband transitions are induced above the corresponding threshold and that metastability of the “excited state BEC” is reached below the 2D threshold [1].","PeriodicalId":6331,"journal":{"name":"2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83101938","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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