Pub Date : 1996-01-01DOI: 10.1109/EQEC.1996.561811
W. Chalupezak, W. Gawlik, B. Lobodzinski, T. Pałasz, J. Zachorowski
{"title":"Resonance fluoresceuce Of an Atom Equally Perturbed by Light and Collisions.","authors":"W. Chalupezak, W. Gawlik, B. Lobodzinski, T. Pałasz, J. Zachorowski","doi":"10.1109/EQEC.1996.561811","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561811","url":null,"abstract":"","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"1 1","pages":"170-170"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90629612","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561509
A. Hemmericl, A. Gorlitz, M. Weidemuller, T. Hansch
rly ~II~II~IIIII ~ . l twry of dectrical coi~drirtivity iii crystal latticcs hy I3loch aiid Zener [ I ] I(YI t,o the striking predirtion that a lioniogciicons static clcctric ficld iiiduces ail oscillatory rather thau u~ i i fo r~ r i notion of the electrons. l lcrr wc preseut Blocli oscillations o f atoiiis i i i I.he fundanieutal and iii the first excit.ccl cwxgy baiid of a periodic optical potential 121. ‘lliis poteiitial results from the light-shift of the grouud state of atoms illuminatr t l hy a laser stailding wave. The laser is detuncd far from any atomic resouancc so tliat spoiitancoiis emission can he neglected. Using one-dimensional Ranian laser cooling [3,4] we first prepare a gas of free atoms with a ~nomentum spread 61, = hk/4 in the direction of the standing wave, where hk i s tlic pliol.on ~nonrei~tum. The corresponding atomic coherence length h/6p extends over ~everal periods d = X/2 = 7 r / k of the optical lattice. I3y adiabatically switching on thc light potential this initial momentum distribution is turned into a statistical mixture of 131ocli stales i n the ground energy band with a quasi-rnomnrtu~n width 6y = 6 p / h much snrallcithan the width 2k of the Brillouin zone. We mimic a constant external force by inl.roducing a t.uiiable frequency difference 6 v ( t ) between the two counterpropagating laser waves rreal.ing the optical potential. For a linear variation io time of 6v( l ) a constant inerl.ial force 1.’ = m a = -mX$6v( t ) /2 is exerted 011 the atoms in the frame of the slanding wave. After a given evolution time, we abruptly switch off the light potential and inrasure thr momentum distribution of the Blocli sl.ate with a resolution of R k / l S . ‘I’lie nieaii atomic velocity displays oscillations with periods in the millisecond range and a~nplit~ndes between 0.7 and 0.3 UR for potential depths (io between 0.8 and 5.6 ER. where i>f? = h.k/7n is the recoil velocity and ER = (hk)’/2m the recoil energy. We measured positive and negative effective masses, differeut from the mass of the free cesium atom. Froiu the measured velocity curves we can reconstruct the shape of the fundamental energy band. Wr have also calculated numerically the band structure for our experimental values of [ io. The agreement with the experimental data is quite good. 4k have niadc investigations of atom acceleratiori in (.he case of deeper potentials up to r:, = 10EJ3. We could still observe Bloch states after more thau 40 oscillation periods. 111 t.lrc Iaboralory frame, this corresponds to a coherent mom en tun^ transfer of S O U . prodnring aii atomic beam with subrecoil momentum spread (h1;/4) in the beam direction.
rly ~II~II~IIIII ~。l twry dectrical coi ~ drirtivity三世水晶latticcs hy I3loch携带齐纳(我)我(YI t o的惊人predirtion lioniogciicons静态clcctric ficld iiiduces苦恼振荡,而肖u ~我我佛~ r电子的概念。所有的函数都可以表示出函数的bloi振荡,即基本激发态和第一激发态。一个周期光势的CCL cwxy。liliis的潜在结果来自于原子基态的光移,从而产生激光驻波。激光在远离任何原子源的地方衰减,因此可以忽略任何杂波辐射。利用一维拉尼激光冷却[3,4],我们首先在驻波方向制备了一种自由原子气体,其动量分布为61,= hk/4,其中hk为最小常数。~ nonrei ~中空的。相应的原子相干长度h/6p扩展到光学晶格的~几个周期d = X/2 = 7 r / k。当光势绝热开启时,初始动量分布变成了地面能带上1310i - 1的统计混合,其准稳态宽度为6y = 6p / h,远小于布里渊带的宽度2k。我们用1来模拟恒定的外力。在两个反向传播的激光波之间产生6 v (t)的可调频率差。Ing光势。对于线性变化时间为6v(l)的恒定内蕴。力1。' = m a = -mX$6v(t) /2施加在倾斜波框架内的原子上。在给定的演化时间后,我们突然关闭光势,并保证Blocli slate的动量分布,其分辨率为R k / l S。“I’lie nieaii”原子速度显示出周期在毫秒范围内的振荡,潜在深度在0.8至5.6 ER之间的~nplit~节点在0.7至0.3 UR之间。我> f在哪里?= hk /7n为后坐力速度,ER = (hk)′/2m为后坐力能量。我们测量了正负有效质量,不同于自由铯原子的质量。根据测量的速度曲线,我们可以重建基本能带的形状。我们还对实验值[o]的带结构进行了数值计算。与实验数据吻合较好。我们对宇宙中的原子加速进行了新的研究。当电位达到r:, = 10EJ3时。在40多个振荡周期后,我们仍然可以观察到布洛赫态。在实验框架中,这对应于S / U的一个连贯的母链转移。在光束方向上产生具有亚后坐力动量扩散(h1;/4)的原子束。
{"title":"New Experiments with Optical Lattices","authors":"A. Hemmericl, A. Gorlitz, M. Weidemuller, T. Hansch","doi":"10.1109/EQEC.1996.561509","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561509","url":null,"abstract":"rly ~II~II~IIIII ~ . l twry of dectrical coi~drirtivity iii crystal latticcs hy I3loch aiid Zener [ I ] I(YI t,o the striking predirtion that a lioniogciicons static clcctric ficld iiiduces ail oscillatory rather thau u~ i i fo r~ r i notion of the electrons. l lcrr wc preseut Blocli oscillations o f atoiiis i i i I.he fundanieutal and iii the first excit.ccl cwxgy baiid of a periodic optical potential 121. ‘lliis poteiitial results from the light-shift of the grouud state of atoms illuminatr t l hy a laser stailding wave. The laser is detuncd far from any atomic resouancc so tliat spoiitancoiis emission can he neglected. Using one-dimensional Ranian laser cooling [3,4] we first prepare a gas of free atoms with a ~nomentum spread 61, = hk/4 in the direction of the standing wave, where hk i s tlic pliol.on ~nonrei~tum. The corresponding atomic coherence length h/6p extends over ~everal periods d = X/2 = 7 r / k of the optical lattice. I3y adiabatically switching on thc light potential this initial momentum distribution is turned into a statistical mixture of 131ocli stales i n the ground energy band with a quasi-rnomnrtu~n width 6y = 6 p / h much snrallcithan the width 2k of the Brillouin zone. We mimic a constant external force by inl.roducing a t.uiiable frequency difference 6 v ( t ) between the two counterpropagating laser waves rreal.ing the optical potential. For a linear variation io time of 6v( l ) a constant inerl.ial force 1.’ = m a = -mX$6v( t ) /2 is exerted 011 the atoms in the frame of the slanding wave. After a given evolution time, we abruptly switch off the light potential and inrasure thr momentum distribution of the Blocli sl.ate with a resolution of R k / l S . ‘I’lie nieaii atomic velocity displays oscillations with periods in the millisecond range and a~nplit~ndes between 0.7 and 0.3 UR for potential depths (io between 0.8 and 5.6 ER. where i>f? = h.k/7n is the recoil velocity and ER = (hk)’/2m the recoil energy. We measured positive and negative effective masses, differeut from the mass of the free cesium atom. Froiu the measured velocity curves we can reconstruct the shape of the fundamental energy band. Wr have also calculated numerically the band structure for our experimental values of [ io. The agreement with the experimental data is quite good. 4k have niadc investigations of atom acceleratiori in (.he case of deeper potentials up to r:, = 10EJ3. We could still observe Bloch states after more thau 40 oscillation periods. 111 t.lrc Iaboralory frame, this corresponds to a coherent mom en tun^ transfer of S O U . prodnring aii atomic beam with subrecoil momentum spread (h1;/4) in the beam direction.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"35 1","pages":"5-5"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86977735","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561539
M. Reck, Klaus Mattle, H. Weinfurter, A. Zeilinger, P. G. Kwait
Circular Rydberg atom strongly coupled to superconducting millimeterwave cavities make it poasible to realize experiments on fundamental aspects of quantum mechanics. Resonant and dispersive atom-field interactions provide ways to realize quantum s t a b swapping and conditional quantum dynamics. They can be used to produce non local correlations and complex, tailored, entangled quantum states in many particle systems. Fundamental test of quantum mechaniw are now within the reach of cavity quantum electrodynamiw experimenta. Complex quantum states are ala0 at the heart of the recently proposed techniques for quantum information processing or quantum computing, a field boiling with excitement. Although cavity QED techniques allow the realization of some basic components, such a quantum logic gata, they also provide experimental insighta into the dewherenee processes, which doom any attempt to realize a large scale quantum information processing ma&. In the light of recant experiments performed in our laboratory, we &CUBS realistic perspectives and impossibilities in this field. Abstract
{"title":"Quantum Coding and Quantum Communications","authors":"M. Reck, Klaus Mattle, H. Weinfurter, A. Zeilinger, P. G. Kwait","doi":"10.1109/EQEC.1996.561539","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561539","url":null,"abstract":"Circular Rydberg atom strongly coupled to superconducting millimeterwave cavities make it poasible to realize experiments on fundamental aspects of quantum mechanics. Resonant and dispersive atom-field interactions provide ways to realize quantum s t a b swapping and conditional quantum dynamics. They can be used to produce non local correlations and complex, tailored, entangled quantum states in many particle systems. Fundamental test of quantum mechaniw are now within the reach of cavity quantum electrodynamiw experimenta. Complex quantum states are ala0 at the heart of the recently proposed techniques for quantum information processing or quantum computing, a field boiling with excitement. Although cavity QED techniques allow the realization of some basic components, such a quantum logic gata, they also provide experimental insighta into the dewherenee processes, which doom any attempt to realize a large scale quantum information processing ma&. In the light of recant experiments performed in our laboratory, we &CUBS realistic perspectives and impossibilities in this field. Abstract","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"30 1","pages":"21-21"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90908391","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561579
S. Seel, R. Storz, G. Ruoso, S. Schiller, J. Mlynek
{"title":"Cryogenic Optical Resonators For Ultra-Stable Lasers","authors":"S. Seel, R. Storz, G. Ruoso, S. Schiller, J. Mlynek","doi":"10.1109/EQEC.1996.561579","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561579","url":null,"abstract":"","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"25 1","pages":"45-45"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89578216","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561521
G. von Plessen, A. M. Fox, M. Dabbicco, G. Schucan, J. F. Ryan
{"title":"Generation of Quadrature Squeezed Light By Cross-Phase Modulation in Semiconductors","authors":"G. von Plessen, A. M. Fox, M. Dabbicco, G. Schucan, J. F. Ryan","doi":"10.1109/EQEC.1996.561521","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561521","url":null,"abstract":"","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"33 1","pages":"11-11"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89254772","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561791
B. Lounis, P. Tamarat, M. Orrit
The fluorescence exciliition spectra ol small and dilute samples of solid solutions kept at helium temperatures display sharp homogeneous lines of individual solute molecules. Single molecule lines arc sensitive to external perturbations such as electric fields or pressurc. The fluctuations of the fluorescence signal show characteristic times ranging from nanoseconds to minutes. They give information about the dynamics within the molecule (intersystem crossing, Rabi nutation) as well i ~ s in the surrounding matrix (spectral diffusion of the resonance frequency). Non-linear optical experiments have been performed on single molecules. First, single pentacene molecules in p-terphenyl crystals demonstrate paramagnetic resonance in their triplet states. This non-linear efrect appears when the molecule is subjected to resonant microwaves in addition to optical excitation. Microwave pulses were used to produce transient effects, and were synchronised with the molecule itself. We performed non-linear optical experiments of the pump-probe type on the narrow excitation lines of single terrylene molecules in a pterphenyl crystal. At low saturations, the pump beam was found to shift the optical transition of the molecule as expected : proportionally to the intensity and inverse pump detuning. The variations of the fluorescence signal (proportional to the excited state population of the molecule) were also studied with pump and probe closer to resonance. Because of triplet saturation, the signal variations are rather weak and high pump powers had to be used. Upon tuning the probe beam through the resonance, W-shaped structures were obtaiped, recalling Autler-Townes splittings. The shape of the structures is correctly reproduced by numerical simulations of the optical Bloch equations in two intense laser fields and indicates photon exchange between pump and probe beams. These results show the possibility of non-linear and quantum optical experiments on single molecules in condensed matter, even though thc shifts observed are much weaker than disorder-induced inhomogeneous broadening. I 09:oo QThE32 Q U A N T U M EFFEC'TS A N D SPECTRAL DYNAMICS OF SINGLE TEIlRYLENE MOLECULES I N A /+TERPHENYL CRYSTAL.
{"title":"Non Linear Spectroscopy of Single Molecules in Low Temperature Solids","authors":"B. Lounis, P. Tamarat, M. Orrit","doi":"10.1109/EQEC.1996.561791","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561791","url":null,"abstract":"The fluorescence exciliition spectra ol small and dilute samples of solid solutions kept at helium temperatures display sharp homogeneous lines of individual solute molecules. Single molecule lines arc sensitive to external perturbations such as electric fields or pressurc. The fluctuations of the fluorescence signal show characteristic times ranging from nanoseconds to minutes. They give information about the dynamics within the molecule (intersystem crossing, Rabi nutation) as well i ~ s in the surrounding matrix (spectral diffusion of the resonance frequency). Non-linear optical experiments have been performed on single molecules. First, single pentacene molecules in p-terphenyl crystals demonstrate paramagnetic resonance in their triplet states. This non-linear efrect appears when the molecule is subjected to resonant microwaves in addition to optical excitation. Microwave pulses were used to produce transient effects, and were synchronised with the molecule itself. We performed non-linear optical experiments of the pump-probe type on the narrow excitation lines of single terrylene molecules in a pterphenyl crystal. At low saturations, the pump beam was found to shift the optical transition of the molecule as expected : proportionally to the intensity and inverse pump detuning. The variations of the fluorescence signal (proportional to the excited state population of the molecule) were also studied with pump and probe closer to resonance. Because of triplet saturation, the signal variations are rather weak and high pump powers had to be used. Upon tuning the probe beam through the resonance, W-shaped structures were obtaiped, recalling Autler-Townes splittings. The shape of the structures is correctly reproduced by numerical simulations of the optical Bloch equations in two intense laser fields and indicates photon exchange between pump and probe beams. These results show the possibility of non-linear and quantum optical experiments on single molecules in condensed matter, even though thc shifts observed are much weaker than disorder-induced inhomogeneous broadening. I 09:oo QThE32 Q U A N T U M EFFEC'TS A N D SPECTRAL DYNAMICS OF SINGLE TEIlRYLENE MOLECULES I N A /+TERPHENYL CRYSTAL.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"35 1","pages":"160-160"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89231475","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561548
V. S. Vavilov, A. Klyukanov, K. Sushkevich, M. Chukichev, A. Awawdeh, R. R. Resvanov
{"title":"Multi-Plasmon Processes in Spectroscopy of Electron-Hole Plasma in A2B6 Semiconductors","authors":"V. S. Vavilov, A. Klyukanov, K. Sushkevich, M. Chukichev, A. Awawdeh, R. R. Resvanov","doi":"10.1109/EQEC.1996.561548","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561548","url":null,"abstract":"","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"103 1","pages":"26-26"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76733475","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561530
P. Vledder, F. Schuurmans, J. I. Dijkhuis
{"title":"Superradiant Excitons in GaAs Single Quantum Wells","authors":"P. Vledder, F. Schuurmans, J. I. Dijkhuis","doi":"10.1109/EQEC.1996.561530","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561530","url":null,"abstract":"","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"17 1","pages":"16-16"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78362160","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561594
M. Vosseburger, H. Roskos, F. Wolter, C. Waschke, K. Kurz, K. Hirakawa, I. Wilke, K. Yamanaka
{"title":"Emission of Terahertz Radiation From Optically Excited Coherent Plasmons in a Two-Dimensional Electron Gas","authors":"M. Vosseburger, H. Roskos, F. Wolter, C. Waschke, K. Kurz, K. Hirakawa, I. Wilke, K. Yamanaka","doi":"10.1109/EQEC.1996.561594","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561594","url":null,"abstract":"","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"3 1","pages":"53-53"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78325042","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 : 1996-01-01DOI: 10.1109/EQEC.1996.561942
V. Bryksin, M. Petrov
The propagation of pulses and beam profiles under the action of two-photon absorption (TPA) has great interest nowadays, because the potential action of TPA as a limitation factor in switching devices using high nonlinearitiesll]. Variational approaches have been applied successfully to the problem of temporal dispersion andlor spatial diffraction in nonlinear propagation which is described by a nonlinear Schrodinger equation[2]. These approaches am usually limited to conservative optical systems, due to mathematical difficulties that the dissipation term brings about. The purpose of this study is lo apply a variational technique to investigate dissipative nonlinear propagation. By means of the generalization of the Kantorovich method, suitable for non-conservative systems, we are able to deal with the problem of soliton propagation under the influence of TPA. Based on the characteristics of the exact solution in the absence of TPA. and supposing an adiabatic process we propose a family of soliton solutions as trial functions. This procedure results in analytical expressions that illustrate the changes during propagation of the soliton’s parameters such as amplitude, width and phase. The rate at which energy is dissipated is also obtained and, as expected, from a TPA process. is proportional to 1’. Comparison of the behavior predicted by our approximate solutions with numerical results available in the literature show very good agreement[3]. The dissipative variational approach can be extended to deal with more dimensions in the NLSE and to different kinds of dissipative nonlinearities as €?+-doped fiber amplifiers. In conclusion, a variational approach for non-conservative propagation has been used to provide a suggestive description for soliton propagation under TPA effect. As the problem of non-conservative propagation is shared by many areas of physics other than light pulse propagation, we emphasize that the present approach may be useful for a quite wide range of areas and different kinds of dissipative terms.
{"title":"A New Mechanism of Passive Mode Locking in A Soliton Fiber Laser","authors":"V. Bryksin, M. Petrov","doi":"10.1109/EQEC.1996.561942","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561942","url":null,"abstract":"The propagation of pulses and beam profiles under the action of two-photon absorption (TPA) has great interest nowadays, because the potential action of TPA as a limitation factor in switching devices using high nonlinearitiesll]. Variational approaches have been applied successfully to the problem of temporal dispersion andlor spatial diffraction in nonlinear propagation which is described by a nonlinear Schrodinger equation[2]. These approaches am usually limited to conservative optical systems, due to mathematical difficulties that the dissipation term brings about. The purpose of this study is lo apply a variational technique to investigate dissipative nonlinear propagation. By means of the generalization of the Kantorovich method, suitable for non-conservative systems, we are able to deal with the problem of soliton propagation under the influence of TPA. Based on the characteristics of the exact solution in the absence of TPA. and supposing an adiabatic process we propose a family of soliton solutions as trial functions. This procedure results in analytical expressions that illustrate the changes during propagation of the soliton’s parameters such as amplitude, width and phase. The rate at which energy is dissipated is also obtained and, as expected, from a TPA process. is proportional to 1’. Comparison of the behavior predicted by our approximate solutions with numerical results available in the literature show very good agreement[3]. The dissipative variational approach can be extended to deal with more dimensions in the NLSE and to different kinds of dissipative nonlinearities as €?+-doped fiber amplifiers. In conclusion, a variational approach for non-conservative propagation has been used to provide a suggestive description for soliton propagation under TPA effect. As the problem of non-conservative propagation is shared by many areas of physics other than light pulse propagation, we emphasize that the present approach may be useful for a quite wide range of areas and different kinds of dissipative terms.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"20 1","pages":"241-241"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74994026","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}