MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Advances in Nonlinear Optics' source. Sat, 24 Apr 2010 16:41:39 +0100 http://www.medworm.com/index.php?rid=3297947&cid=s_37722_75_f&fid=37722&url=http%3A%2F%2Fwww.hindawi.com%2Fjournals%2Fano%2F2009%2F371974.html We present optical phase conjugation based on the degenerate four-wave mixing (DFWM) arrangement in gelatin films doped with acid blue 3 dye (FAST GREEN FCF) using He-Ne laser of total power 50 mW. Various parameters which influence the phase-conjugate (PC) signal during the DFWM process were studied (angle of between the forward pump and the probe beam, transition of gelatin film, reflectivity as a function of forward and backward beam). A maximum phase-conjugate beam reflectivity of about 0.02% has been observed in these dye-doped gelatin films. PACS: 42.65.-k, 42.65.Hw. (Source: Advances in Nonlinear Optics) Advances in Nonlinear Optics journals http://www.medworm.com/rss/comments.php?id=3297947 Tue, 23 Feb 2010 16:52:02 +0100 3297947 http://www.medworm.com/index.php?rid=2842190&cid=s_37722_75_f&fid=37722&url=http%3A%2F%2Fwww.hindawi.com%2Fjournals%2Fano%2F2009%2F181467.html We overview our recent developments in the theory of dispersion-managed (DM) solitons within the context of optical applications. First, we present a class of localized solutions with a period multiple to that of the standard DM soliton in the nonlinear Schrödinger equation with periodic variations of the dispersion. In the framework of a reduced ordinary differential equation-based model, we discuss the key features of these structures, such as a smaller energy compared to traditional DM solitons with the same temporal width. Next, we present new results on dissipative DM solitons, which occur in the context of mode-locked lasers. By means of numerical simulations and a reduced variational model of the complex Ginzburg-Landau equation, we analyze the influence of the different dissip... Advances in Nonlinear Optics journals http://www.medworm.com/rss/comments.php?id=2842190 Tue, 29 Sep 2009 18:26:54 +0100 2842190 http://www.medworm.com/index.php?rid=2605562&cid=s_37722_75_f&fid=37722&url=http%3A%2F%2Fwww.hindawi.com%2Fjournals%2Fano%2F2009%2F926810.html We present a unifying description of localized states observed in systems with coexistence of two spatially periodic states, called bi-pattern systems. Localized states are pinned over an underlying lattice that is either a self-organized pattern spontaneously generated by the system itself, or a periodic grid created by a spatial forcing. We show that localized states are generic and require only the coexistence of two spatially periodic states. Experimentally, these states have been observed in a nonlinear optical system. At the onset of the spatial bifurcation, a forced one-dimensional amplitude equation is derived for the critical modes, which accounts for the appearance of localized states. By numerical simulations, we show that localized structures persist on two-dimensional systems ... Advances in Nonlinear Optics journals http://www.medworm.com/rss/comments.php?id=2605562 Thu, 16 Jul 2009 12:11:36 +0100 2605562 http://www.medworm.com/index.php?rid=2468378&cid=s_37722_75_f&fid=37722&url=http%3A%2F%2Fwww.hindawi.com%2Fjournals%2Fano%2F2008%2F480362.html This paper presents a numerical study of parabolic pulse generation in tapered microstructured optical fibres (MOFs). Based on our results and the algorithms presented, one can determine the linear taper profile (starting and finishing pitch values and taper length) needed to achieve parabolic pulse shaping of an initial Gaussian pulse shape with different widths and powers. We quantify the evolution of the parabolic pulse using the misfit parameter and show that it is possible to reach values significantly better than those obtained by a step index fibre. (Source: Advances in Nonlinear Optics) Advances in Nonlinear Optics journals http://www.medworm.com/rss/comments.php?id=2468378 Wed, 10 Jun 2009 05:16:38 +0100 2468378 http://www.medworm.com/index.php?rid=2468377&cid=s_37722_75_f&fid=37722&url=http%3A%2F%2Fwww.hindawi.com%2Fjournals%2Fano%2F2008%2F239037.html This paper presents a numerical study of high birefringence induced by four types (Type 1–4) of different sizes of elliptical air holes in photonic crystal fibers (PCFs). The numerical simulation is carried out by using the finite element method. The statistical correlations between the birefringence and the various parameters are obtained. Based on our results, the birefringence is found to be largely dependent on the variation of the normalized frequency, size ratio, effective area of the circular and elliptical air holes, and the ring number of cladding. Two of our suggested structures, Type 1 and Type 3, can considerably enhance the birefringence in PCFs leading to values as high as 7.697×10−3 and 8.002×10−3, respectively, which are much higher than th... Advances in Nonlinear Optics journals http://www.medworm.com/rss/comments.php?id=2468377 Wed, 10 Jun 2009 05:16:38 +0100 2468377 http://www.medworm.com/index.php?rid=2218166&cid=s_37722_75_f&fid=37722&url=http%3A%2F%2Fwww.hindawi.com%2FGetArticle.aspx%3Fdoi%3D10.1155%2F2008%2F239037 This paper presents a numerical study of high birefringence induced by four types (Type 1–4) of different sizes of elliptical air holes in photonic crystal fibers (PCFs). The numerical simulation is carried out by using the finite element method. The statistical correlations between the birefringence and the various parameters are obtained. Based on our results, the birefringence is found to be largely dependent on the variation of the normalized frequency, size ratio, effective area of the circular and elliptical air holes, and the ring number of cladding. Two of our suggested structures, Type 1 and Type 3, can considerably enhance the birefringence in PCFs leading to values as high as 7.697×10−3 and 8.002×10−3, respectively, which are much higher than th... Advances in Nonlinear Optics journals http://www.medworm.com/rss/comments.php?id=2218166 Fri, 27 Feb 2009 07:28:39 +0100 2218166 http://www.medworm.com/index.php?rid=1618926&cid=s_37722_75_f&fid=37722&url=http%3A%2F%2Fwww.hindawi.com%2FGetArticle.aspx%3Fdoi%3D10.1155%2F2008%2F480362 This paper presents a numerical study of parabolic pulse generation in tapered microstructured optical fibres (MOFs). Based on our results and the algorithms presented, one can determine the linear taper profile (starting and finishing pitch values and taper length) needed to achieve parabolic pulse shaping of an initial Gaussian pulse shape with different widths and powers. We quantify the evolution of the parabolic pulse using the misfit parameter and show that it is possible to reach values significantly better than those obtained by a step index fibre. (Source: Advances in Nonlinear Optics) Advances in Nonlinear Optics journals http://www.medworm.com/rss/comments.php?id=1618926 Mon, 14 Jul 2008 16:43:15 +0100 1618926