Light propagation in gain media agrawal govind p premaratne malin
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Indeed, the shape, the chirp profile, and the spectrum of the output pulse agree well with the predictions of the analytic self-similar solution. A normalization condition is used in practice to provide a unique representation of any physical state. These boundary conditions are known as the absorbing boundary conditions. Some of the results are published here for the first time, e. The achievable shortest pulse width is found to be limited by third-order dispersion that has a significant effect on the pulse-compression dynamics. Considering three configurations of hemispherical dimers, we show that both the frequency and the strength of plasmon resonances in each configuration are highly dependent on the inter-particle distance and the state of polarization of the incident light. In Chapter 4, we discuss how to model a gain medium under such conditions by deploying optical Bloch equations.

In the special case of a single-cycle pulse, the most dominant effect is self-steepening and it leads to dramatically different features in both the shape and spectrum of output pulses. Many textbooks cover sources and detectors, but very few cover propagation in a comprehensive way, incorporating the latest progress in theory and experiment concerning the propagating medium. A mode locked fibre laser as a source of ultra-stable pulse train has revolutionised a wide range of fundamental and applied research areas by offering high peak powers, high repetition rates, femtosecond range pulse widths and a narrow linewidth. These forms are then used to classify different optical materials through the constitutive relations. Subject to statutory exception and to the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press.

In short, efficient parametric interaction can only take place in a certain frequency window and is highly dependent on the dispersive properties of the medium, or on the nature of wave-guiding in the case of an optical waveguide. Hagness, Computational Electrodynamics: The Finite-Difference Time-Domain Method, 3rd ed. It is easy to see from Eq. This transformation essentially constituted an analytic continuation of the wave equation into the complex domain, replacing propagating waves with exponentially decaying waves. Consider a time-harmonic, monochromatic, plane wave traveling in the +z direction of a right-handed coordinate system.

In the case of free space, ε and µ are replaced with their free-space values ε0 and µ0. We include random linear mode coupling among fiber modes using three different models based on an analysis of the impact of random coupling on differences of propagation constants between modes. We also discuss how such intricate measurements of spatial and temporal effects allow crucial time penalties to be eliminated in guided soliton propagation, and should be used to unambiguously identify the Newton-Wigner time delays for particles. If the signals group velocity can be reduced by a factor of 10 compared to its value in a bulk silicon, it may result in ultrahigh gains exceeding 100dB. Helps the reader develop an intuitive grasp of the most common mathematical methods, useful for describing the action of general linear systems on signals of one or more spatial dimensions. It is useful reference book for researchers, and a textbook for courses like Laser Light Propagation, Solid State Optics, and Optical Propagation in the Atmosphere.

It will also be of great interest to those involved in research or development in microelectronic or optoelectronic devices. However, only one of these parameters makes physical sense, and the one selected is called the complex refractive index of the material. We apply our recently developed time-transformation method for studying the propagation of few-cycle optical pulses inside a nonlinear Kerr medium after taking into account that changes in the refractive index vary with the electric field as E2 and not by its average over an optical cycle. This book provides a comprehensive treatment of the fundamental concepts, theory and analytical techniques behind the modern optical amplifier technology. Neither the initial pulse shape nor its width has any effect on the final parabolic pulse. Before proceeding further, we need an analytic form of the refractive index n ω associated with the medium.

To calculate it, one needs to solve a coupled set of rate equations for the atomic densities; its final expression depends on the energy-level model employed. We show that tunable frequency combs can be generated by launching two continuous-wave pumps at slightly different wavelengths into a normally dispersive optical fiber. Responsibility: Malin Premaratne, Govind P. Further insight can be gained by considering the factor by which the signal is amplified in an amplifier of length L. The readers are assumed to have background in electrical engineering or applied modern physics, including some exposure to electrodynamics and wave motion. One has to be careful at this point because such an operation exhibits a branch-cut singularity.

Premaratne was born one of five sons to Sardiris Master and Emilin Nona. Eberly, Optical Resonance and Two-Level Atoms. In addition to this, the technology has applications in cutting-edge research such as biophotonics and lab-on-a-chip devices. Furthermore, its value varies strongly in the vicinity of the geometrical focus, and its maximum, which need not occur at the focus, can be significantly higher than that of the incident beam. In our device, the conventionally used gold layer is replaced with a graphene microribbon for the detection of biochemical molecules. Energy for amplifying the incident beam comes from the pump light, whose absorption raises rare-earth ions to an excited state, thereby storing the energy that is eventually transferred to the signal beam being amplified. The E-mail message field is required.

The second part establishes a general mathematical framework for treating ray optics as a theory in its own right, making extensive use of the Hamiltonian formalism. As an example, if the pump is polarized along the slow axis, and the signal and the idler are polarized along the fast axis, then the net gain given in Eq. This is possible because interaction between atoms and electromagnetic radiation 94 Optical Bloch equations atom with multiple energy levels incident radiation at angular frequency v 2 បv 1 Figure 4. We use this equation to analyze the amplification of Gaussian pulses in a silicon Raman amplifier. We theoretically study the problem of Raman gain maximization in uniform silicon photonic-crystal waveguides supporting slow optical modes. Whenever possible, we obtain approximate analytical results to estimate the operational characteristics of amplifiers, thus enabling the reader to build a detailed intuitive picture about the device operation. .

It is clear from Eq. Most importantly, our approach is not to pick a specific model but to show diverse models and techniques to the reader so that reader can make the best possible choice of the method based on the circumstances and the domain of applicability. In quantum mechanics, such a situation is Energy Virtual state Incident photon Stokes photon Incident photon Anti-Stokes photon Vibrational states Figure 7. This behavior is illustrated in Figure 8. An approximate approach for dealing with femtoseond pulses relaxes the parabolic-gain approximation made in deriving the Ginzburg—Landau equation.