5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.最新文献

{"title":"Achromatic and super-achromatic zero-order waveplates","authors":"A. V. Samoylov, V. S. Samoylov","doi":"10.1109/LFNM.2003.1246095","DOIUrl":"https://doi.org/10.1109/LFNM.2003.1246095","url":null,"abstract":"The waveplates are widely used to transform a state of polarization radiation. This paper describes anisotropic properties of polymethylmethacrylate (PMMA) subjected to one-axis stretching and a construction and properties of achromatic and super-achromatic waveplates produced of PMMA. The most technological method to produce such waveplates is the controlled stretching of PMMA sheets to a retardation needed. This method excludes the mechanical treatment of waveplates. In generality of properties, these waveplates are ones of the best and unique in their dimensions, which may be up to 60 mm.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126707463","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}

{"title":"Broad area self-focused distributed Bragg reflector laser diodes","authors":"G. Sokolovskii, D. Yanson, E. Rafailov, V. Kuchinskii, A. G. Deryagin, A. C. Bryce, J. Marsh, W. Sibbett","doi":"10.1109/LFNM.2003.1246070","DOIUrl":"https://doi.org/10.1109/LFNM.2003.1246070","url":null,"abstract":"This work was aimed to investigate new type laser diodes incorporating distributed confocal gratings. The devices exhibited single-longitudinal mode operation with a side-mode suppression ratio of over 30 dB and a laterally focused beam for focal lengths around 0.5 mm. These laser sources will be suitable for applications requiring both spectrally and spatially enhanced beam quality.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122959169","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}

{"title":"Spectra and thresholds of the 2-D modes in a ring microcavity laser","authors":"E. Smotrova, A. Nosich","doi":"10.1109/LFNM.2003.1246074","DOIUrl":"https://doi.org/10.1109/LFNM.2003.1246074","url":null,"abstract":"Semiconductor microdisk and microring lasers are of interest for micron-scale low-threshold laser devices. The modes of a thin dielectric cavity are complicated solutions of the 3-D Maxwell equations. However, if the disk or ring cavity thickness is only a fraction of the wavelength the modes can be studied in 2-D formulation. In this paper we study lasing eigenvalue problem (LEP) for the H-polarised modes in a ring dielectric microcavity. The analysis revealed the following facts: the WG modes experience quasitotal reflection at the cavity rim that leads to exponentially small threshold getting down with index m. In each m-th family WG/sub m,1/ mode has the lowest threshold. In the range k< m//spl alpha/ lasing modes are found. The lowest thresholds are observed if the inner radius b is small. Only the modes WGHm1 having large enough values of m can \"survive\" the thin ring-like cavities(b/spl ap/a).","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122172767","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}

{"title":"Tunneling peculiarities in asymmetrical quantum-well structures","authors":"A. Shulika, V. Lysak, I. Sukhoivanov","doi":"10.1109/LFNM.2003.1246138","DOIUrl":"https://doi.org/10.1109/LFNM.2003.1246138","url":null,"abstract":"Asymmetrical quantum-well structures (AMQW) are layered semiconductor heterostructures having quantum wells of various depth, width, and shape. There are dimensional, compositional, and compound AMQW depending on the cause, which defines potential profile. In SOA with multiple quantum-wells and AMQW as well as in quantum-well lasers carrier transport effects become important and govern nonuniform carrier distribution along the active area. As a rule tunneling transfer is neglected under simulation of multiple quantum-well dynamics. However, tunneling can make significant concurrence for other transport processes under room temperature and thin barriers. The tunneling is the transfer of charge carriers between wells without variation of their energy. Since the structure under consideration is multilayered quantum wells this kind of carrier transfer provides resonant behavior. To take tunneling into account in the frame of rate equations we describe the tunneling rate by means tunneling time. For tunneling time computation we use the group velocity conception in the frame of semiclassical treatment. Our simulations have showed that tunneling time can be comparable to other transport times and even less.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115547439","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}

{"title":"Analytical and experimental investigations of nonlinear dynamics of photopolymer Bragg gratings at pulse recording","authors":"E. Dovolnov, S. Sharangovich, E. Pen, V. Shelkovnikov","doi":"10.1117/12.583467","DOIUrl":"https://doi.org/10.1117/12.583467","url":null,"abstract":"In this paper, the analytical models of pulse record of diffraction gratings in photopolymer material (PPM) are presented. In the analytical model we take into consideration that record process is realized with optical pulse string. The model is developed for transmitted gratings recorded at photoinduced optical absorption. The diffraction efficiency of gratings has been calculated on the base of the analytical model. The experimental investigations of pulse recording have been carried out in HPPM-630 photopolymer material. The matching of data calculated theoretically and experimental data have been made.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123194490","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}

{"title":"Exact analytical Helmholtz bright and dark solitons","authors":"P. Chamorro-Posada, G. S. McDonald","doi":"10.1117/12.583404","DOIUrl":"https://doi.org/10.1117/12.583404","url":null,"abstract":"In this paper, we have presented exact analytical Helmholtz bright and dark soliton solutions for a Kerr nonlinearity. Simulations verify that these solutions are both robust and act as attractors in nonlinear beam dynamics. Results dealing with the coherent interaction of Helmholtz bright solitons have also been presented, for the first time. These considerations extend previous(paraxial) studies that are only valid for vanishingly small interaction angles.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121866780","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}

{"title":"Optical fibres with sharp discontinuities as intracavity mode-locking devices for ultrashort-pulse fibre ring lasers","authors":"E. Romanova, E. Bekker, L. Melnikov","doi":"10.1109/LFNM.2003.1246153","DOIUrl":"https://doi.org/10.1109/LFNM.2003.1246153","url":null,"abstract":"1. In a Ken-lens mode-locking (KLM) resonator (Fig. la) for femtosecond pulse generation, the self-focusing effect within a Ken medium (KM) modifies the cavity mode profile. This is described as a self-amplitude modulation resulting in either decreasing loss through an internal aperture as the field intensity increases (hard aperturing) or increasing gain by adjusting the overlap between the cavity and the pump mode profiles (soft aperturing). Because the KLM uses bulk nonlinearities, it is well suited for mode-locking bulk solid-state lasers which have high intracavity intensities [l]. In fibre lasers, where nonlinear phase shifts are integrated over the fibre length, the additive pulse mode-locking (APM) is used. Polarisation APM (P-APM) relies on the intensity-dependent rotation of the elliptical polarisation state in a length of optical fibre. With proper settings of the initial polarization ellipse and phase bias, pulse shortening occurs. Optical fibre is well suited for nonlinear polarization rotation because the small mode diameter leads to high intensities and thus to a large nonlinear index change, and because long fibre length can be used. Unidirectional fibre ring cavity has low self-starting threshold. It can operate in the soliton regime, where the group velocity dispersion is negative, or in the stretched pulse regime (Fig. 1 b), where sections of both positiveand negative-dispersion fibre are used [ 2 ] . However polarization elements are sensitive to thermal and mechanical environmental changes. As an alternative to the polarization mode-locking devices, we suggest to use fibre discontinuities to achieve KLM operation in the fibre ring lasers. Step-like discontinuity in a fibre loop can be considered as an analog to a hard aperture inside linear resonator of the KLM laser. In our previous works, we have demonstrated applicability of the step-like discontinuities for pulse compression in optical fibres [3]. In this paper, mode-locking action of the both polarization rotator and step-like discontinuity is evaluated depending on parameters of the devices and compared. Ultra-short pulse propagation through nonlinear fibre segments is simulated numerically with account of material dispersion and gain in the fibre loop.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121542530","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}

{"title":"Nonlinear localization in modulated and incommensurate (self-modulated) optical structures","authors":"I. V. Gerasimchuk, A. Kovalev, G. Maugin","doi":"10.1109/LFNM.2003.1246107","DOIUrl":"https://doi.org/10.1109/LFNM.2003.1246107","url":null,"abstract":"The summary form only given. Both theoretical and experimental investigations of structure and dynamics of 2D mono-atomic surface layers, layers of adatoms and ID adatoms chains on the surface are of great interest now. Usually these adatoms form the incommensurate structures on the surface. In the simplest approach this problem can be studied in the framework of sin-Gordon model. (The substrate is considered to be rigid.) In this model an incommensurate structure represents the periodic array of topological solitons (kinks). The linear excitations in this structure (Swihart mode) are well-known in the theory of Josephson junction. The additional kink propagating through such an incommensurate structure represents the elementary nonlinear excitation in the system. The exact analytical solution for this dynamical soliton was obtained-by using Darboux transformation for SGE. It is interesting that there exists the minimal nonzero velocity of such a kink. That velocity coincides with Swihart velocity. The knowledge of this soliton solution allows us to obtain through the Baklund transformation the more complicated exact solution for envelope two-parametric soliton. In particular limit case this solution describes the small amplitude nonlinear excitations in the incommensurate surface structure. On the other hand, it represents the so-called \"gap\" soliton with the frequencies in the gap above Swihart mode. Also we propose the qualitative approach to nonlinear dynamics of the incommensurate structure in terms of a chain of quasiparticles with definite nonlinear interaction. (The kinks of incommensurate structure play the role of these quasiparticles.) In long-wave small-amplitude approximation Boussinesq equation is obtained for this effective chain. The well-known soliton solutions of Boussinesq equation are consistent with obtained exact solutions in the small-amplitude limit.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123797177","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}

{"title":"Light-controlled multichannel switches on the basis of nonlinear interferometers for optical communication lines and networks","authors":"A. M. Goncharenko, G. Sinitsyn, A. Lyakhnovich, S. Apanasevich, M. Khodasevich, A. Kazberuk, Yu. A. Varaxa, A. V. Burak, V. A. Klinouski","doi":"10.1117/12.583473","DOIUrl":"https://doi.org/10.1117/12.583473","url":null,"abstract":"The phenomenon of optical bistability (OB), including the so-called transverse effects in distributed OB-systems, offers additional opportunities for development of new architecture designs in optical systems of information processing and communications. In particular, this contribution deals with a class of all-optical multiplexers/demultiplexers (MDM) for data redirecting and processing in the nodes of fiber-optical communication channels and networks. Their specific features are dynamic connection remapping and the possibility of applying WDM/DWDM techniques. As switching elements optically nonlinear and bistable thin-film Fabry-Perot interferometers (TFI) are used. Thus the developed MDM are capable of operating at several wavelengths that correspond to the carrier frequency set of working bands of WDM/DWDM systems.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129226420","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}

{"title":"Cepstrum analysis in holographic information systems","authors":"V. Titar, O. Shpachenko","doi":"10.1109/LFNM.2003.1246102","DOIUrl":"https://doi.org/10.1109/LFNM.2003.1246102","url":null,"abstract":"Logarithmic detector characteristic for hologram recording, allows combining of holographic data processing and cepstrum analysis. Cepstrum analysis permits data processing when signals are represented as a product or convolution of several signals. For enhancement of holographic images and data extraction from holographic images cepstrum analysis is used. The general scheme of visual analyzer of higher animal corresponds to that of signal processing with the aid of cepstrum analysis in holography information systems.","PeriodicalId":368970,"journal":{"name":"5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128070846","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}