Computer simulation of wave propagation through turbulent media Davis, Charles A.
... recasts the Huygens-Fresnel solution into a form utilizing fast Fourier transforms easily implemented in a computer simulation. It then summarizes the Rytov-Tatarski solution to the scalar wave equation which used first order perturbation theory and statistical techniques to describe the spatial var ...
... recasts the Huygens-Fresnel solution into a form utilizing fast Fourier transforms easily implemented in a computer simulation. It then summarizes the Rytov-Tatarski solution to the scalar wave equation which used first order perturbation theory and statistical techniques to describe the spatial var ...
THESIS Theoretical Study of Light Scattering by an Elliptical Cylinder
... wavelength) is easy to go through the thick atmosphere than the blue one while the later is more scattered in the sky. The second reason is that the knowledge acquired in understanding those phenomena serves us in the development of new measurement technologies. When the light interacts with particl ...
... wavelength) is easy to go through the thick atmosphere than the blue one while the later is more scattered in the sky. The second reason is that the knowledge acquired in understanding those phenomena serves us in the development of new measurement technologies. When the light interacts with particl ...
Gaussian Beam Propagation
... systems that they have been extensively analyzed, starting with some of the classic treatments mentioned in Chapter 1. Almost every text on optical systems discusses Gaussian beam propagation in some detail, and several comprehensive review articles are available. However, for millimeter and submill ...
... systems that they have been extensively analyzed, starting with some of the classic treatments mentioned in Chapter 1. Almost every text on optical systems discusses Gaussian beam propagation in some detail, and several comprehensive review articles are available. However, for millimeter and submill ...
PHOTONIC CRYSTALS WITH ACTIVE ORGANIC MATERIALS by
... Figure 1-1 Classical picture of the interaction between electrons and electromagnetic wave. (a) No external field. (b) External field polarizes the medium and creates an induced dipole moment. (c) Atomic potential plotted against the distance between electron and nuclei. ............................ ...
... Figure 1-1 Classical picture of the interaction between electrons and electromagnetic wave. (a) No external field. (b) External field polarizes the medium and creates an induced dipole moment. (c) Atomic potential plotted against the distance between electron and nuclei. ............................ ...
Optical Parametric Processes with Femtosecond
... OPG: Optical Parametric Generation OPO: Optical Parametric Oscillator SC: Supercontinuum SFG: Sum-Frequency Generation SFM: Self-phase Modulation SHG: Second-Harmonic Generation SVEA: Slowly Varying Amplitude Approximation THG: Third-Harmonic Generation X‐FROG: Cross- Frequency Resolved Optical Gati ...
... OPG: Optical Parametric Generation OPO: Optical Parametric Oscillator SC: Supercontinuum SFG: Sum-Frequency Generation SFM: Self-phase Modulation SHG: Second-Harmonic Generation SVEA: Slowly Varying Amplitude Approximation THG: Third-Harmonic Generation X‐FROG: Cross- Frequency Resolved Optical Gati ...
Diffraction - ICT for IST
... links to files, which are non-downloadable or protected by copyright. These comprise a large number of examples and a non-systematic (chaotic) way of picking up and presenting just a few of them, which illustrate a phenomenon but not the principles, should be avoided. It seems also very useful, espe ...
... links to files, which are non-downloadable or protected by copyright. These comprise a large number of examples and a non-systematic (chaotic) way of picking up and presenting just a few of them, which illustrate a phenomenon but not the principles, should be avoided. It seems also very useful, espe ...
The effect of gamma radiation on fibre Bragg
... performance, and in particular the Bragg Wavelength Shift (BWS) whilst being exposed to ionizing radiation. Current research suggests that certain types of fibres manufactured by varying methods produce different results. The different responses to exposure from gamma irradiation between Germanium ( ...
... performance, and in particular the Bragg Wavelength Shift (BWS) whilst being exposed to ionizing radiation. Current research suggests that certain types of fibres manufactured by varying methods produce different results. The different responses to exposure from gamma irradiation between Germanium ( ...
Full text - Simon Fraser University
... boron nitride, have attracted much interest in the last few decades. When electrons are confined to move in two dimensions, several extraordinary applications arise due to this physical effect. For example, the quantum Hall effect happens in a two-dimensional systems usually at low temperatures. Recent ...
... boron nitride, have attracted much interest in the last few decades. When electrons are confined to move in two dimensions, several extraordinary applications arise due to this physical effect. For example, the quantum Hall effect happens in a two-dimensional systems usually at low temperatures. Recent ...
Digital Radiographic Image Acquisition and Processing
... An anteroposterior knee digital image shows not only the soft tissue but also the edge of the skin. This is due to the wider dynamic recording range and does not mean that there is additional detail. Elsevier items and derived items © 2008 by Mosby, Inc., an affiliate of Elsevier Inc. ...
... An anteroposterior knee digital image shows not only the soft tissue but also the edge of the skin. This is due to the wider dynamic recording range and does not mean that there is additional detail. Elsevier items and derived items © 2008 by Mosby, Inc., an affiliate of Elsevier Inc. ...
Design, near-field characterization, and modeling of 45° surface
... responds to a mirror designed for SPP of 0 = 800 nm incoming at 45° incidence. An important difference between the samples fabricated for near-field characterization and those intended for far-field observation is that, in the former ones, the single gold lines surrounding the mirror are not includ ...
... responds to a mirror designed for SPP of 0 = 800 nm incoming at 45° incidence. An important difference between the samples fabricated for near-field characterization and those intended for far-field observation is that, in the former ones, the single gold lines surrounding the mirror are not includ ...
ELECTRO-OPTIC DIFFRACTION GRATING EMPLOYING
... Electro-optic diffraction modulation was demonstrated by patterning one of the two ITO films into an interdigitated design, done via standard photolithography techniques for initial experimental verification, and via focused ion beam milling for sub-micron scale electrodes. An electrical potential d ...
... Electro-optic diffraction modulation was demonstrated by patterning one of the two ITO films into an interdigitated design, done via standard photolithography techniques for initial experimental verification, and via focused ion beam milling for sub-micron scale electrodes. An electrical potential d ...
Biomedical Optical Imaging
... system. The light source can be either a femtosecond laser or a broadband superluminescent diode (SLD). Our earlier studies used a femtosecond Ti:Sapphire laser for ultrahigh-resolution imaging, however modern multiplexed SLD light sources can now generate very broad bandwidths and achieve axial res ...
... system. The light source can be either a femtosecond laser or a broadband superluminescent diode (SLD). Our earlier studies used a femtosecond Ti:Sapphire laser for ultrahigh-resolution imaging, however modern multiplexed SLD light sources can now generate very broad bandwidths and achieve axial res ...
Multiplexed Digital Holography incorporating Speckle
... have been introduced where a synthetic wavelength is used to produce the phase. The use of multi-wavelength (MW) also opens up the possibility to inspect optically rough objects by comparing the change of phase because of a wavelength shift. The use of several wavelengths can though lead to chromati ...
... have been introduced where a synthetic wavelength is used to produce the phase. The use of multi-wavelength (MW) also opens up the possibility to inspect optically rough objects by comparing the change of phase because of a wavelength shift. The use of several wavelengths can though lead to chromati ...
Raman microscopy in an electron microscope: combining chemical
... contrast and so is capable of being imaged. Contrast can be caused either by a change in the number of secondary electrons, or by a change in the efficiency with which they are collected. Thus, if the beam scans over a surface with topography then the local angle of incidence, and hence the secondar ...
... contrast and so is capable of being imaged. Contrast can be caused either by a change in the number of secondary electrons, or by a change in the efficiency with which they are collected. Thus, if the beam scans over a surface with topography then the local angle of incidence, and hence the secondar ...
Development of a process for characterization of Nd:YAG crystals
... At thermal equilibrium, the lower energy states in the material are more heavily populated than the higher energy states. Under the correct conditions, a substance will absorb energy from an incident electromagnetic wave, thereby raising the atoms from a lower energy level to a higher one. This is t ...
... At thermal equilibrium, the lower energy states in the material are more heavily populated than the higher energy states. Under the correct conditions, a substance will absorb energy from an incident electromagnetic wave, thereby raising the atoms from a lower energy level to a higher one. This is t ...
Document
... in the optical tweezers where manipulation of small particles is needed. OAM has also found its place in communication and computation, both classical and quantum. OAM eigenmodes, can be used as an alphabet for free-space communication [6]. The multidimensionality of the OAM space allows to expand t ...
... in the optical tweezers where manipulation of small particles is needed. OAM has also found its place in communication and computation, both classical and quantum. OAM eigenmodes, can be used as an alphabet for free-space communication [6]. The multidimensionality of the OAM space allows to expand t ...
leading, peer-reviewed scientific journal
... the linear distribution of data points in a direction transverse to the usual direction of correlation. This shift is generally uniform along the entire length of the distribution of data points such that a linear correlation is preserved. This is analogous to the effect expected of the Polarimetric ...
... the linear distribution of data points in a direction transverse to the usual direction of correlation. This shift is generally uniform along the entire length of the distribution of data points such that a linear correlation is preserved. This is analogous to the effect expected of the Polarimetric ...
THE NEMATIC { SMECTIC-A PHASE TRANSITION: A HIGH
... the visitors, Andrei Sonin, Francois Coulombeau, Laurent Daudet, Wenceslao GonzalezVi~nas, Nick Costanzino and Damien Jurine. Michael Plischke, Michael Wortis and Barbara Frisken for being available for advice and discussions. Brett Heinrich for his generous access to the electromagnet, and all thos ...
... the visitors, Andrei Sonin, Francois Coulombeau, Laurent Daudet, Wenceslao GonzalezVi~nas, Nick Costanzino and Damien Jurine. Michael Plischke, Michael Wortis and Barbara Frisken for being available for advice and discussions. Brett Heinrich for his generous access to the electromagnet, and all thos ...
“Superluminal” Pulse Propagation Dynamics by George M. Gehring
... erbium-doped fiber (center). The edges of the EDOF are denoted by the vertical green lines, and the times are given in microseconds. The group index for the erbium fiber region is approximately ng = −4000. Arrows mark the approximate position of the peak. . . . . . . . . . . ...
... erbium-doped fiber (center). The edges of the EDOF are denoted by the vertical green lines, and the times are given in microseconds. The group index for the erbium fiber region is approximately ng = −4000. Arrows mark the approximate position of the peak. . . . . . . . . . . ...
gaussian beam optics
... or shape the laser beam by using lenses and other optical elements. In general, laser-beam propagation can be approximated by assuming that the laser beam has an ideal Gaussian intensity profile, which corresponds to the theoretical TEM00 mode. Coherent Gaussian beams have peculiar transformation pr ...
... or shape the laser beam by using lenses and other optical elements. In general, laser-beam propagation can be approximated by assuming that the laser beam has an ideal Gaussian intensity profile, which corresponds to the theoretical TEM00 mode. Coherent Gaussian beams have peculiar transformation pr ...
Plane-wave scattering by a set of perfectly conducting circular
... Wait for cases of both a perfectly conducting plane23 and a vacuum-dielectric interface.24 Furthermore, for the case of a single cylinder in front of an interface, the problem has been approached with various techniques.25–30 When the surface coincides with the interface between vacuum and a dielect ...
... Wait for cases of both a perfectly conducting plane23 and a vacuum-dielectric interface.24 Furthermore, for the case of a single cylinder in front of an interface, the problem has been approached with various techniques.25–30 When the surface coincides with the interface between vacuum and a dielect ...
Aalborg Universitet Photonic crystal distributed feedback fiber lasers with Bragg gratings
... are required for accurate modeling of the structures considered in this paper, and it is exactly for large numerical problems that this method is numerically efficient compared to previous plane wave expansion methods [21]. More details regarding the method may be found in [12]. The single-mode prop ...
... are required for accurate modeling of the structures considered in this paper, and it is exactly for large numerical problems that this method is numerically efficient compared to previous plane wave expansion methods [21]. More details regarding the method may be found in [12]. The single-mode prop ...
Laser and Gaussian Beam Propagation and Transformation
... Optical engineers and researchers working on optics deal with laser beams and optical systems as usual tools in their specific areas. The knowledge of the special characteristics of the propagation of laser beams through optical systems has to be one of the keystones of their actual work, and the cl ...
... Optical engineers and researchers working on optics deal with laser beams and optical systems as usual tools in their specific areas. The knowledge of the special characteristics of the propagation of laser beams through optical systems has to be one of the keystones of their actual work, and the cl ...
Phase-contrast X-ray imaging
Phase-contrast X-ray imaging (PCI) or phase-sensitive X-ray imaging is a general term for different technical methods that use information concerning changes in the phase of an X-ray beam that passes through an object in order to create its images. Standard X-ray imaging techniques like radiography or computed tomography (CT) rely on a decrease of the X-ray beam's intensity (attenuation) when traversing the sample, which can be measured directly with the assistance of an X-ray detector. In PCI however, the beam's phase shift caused by the sample is not measured directly, but is transformed into variations in intensity, which then can be recorded by the detector.In addition to producing projection images, PCI, like conventional transmission, can be combined with tomographic techniques to obtain the 3D distribution of the real part of the refractive index of the sample. When applied to samples that consist of atoms with low atomic number Z, PCI is more sensitive to density variations in the sample than conventional transmission-based X-ray imaging. This leads to images with improved soft tissue contrast.In the last several years, a variety of phase-contrast X-ray imaging techniques have been developed, all of which are based on the observation of interference patterns between diffracted and undiffracted waves. The most common techniques are crystal interferometry, propagation-based imaging, analyzer-based imaging, edge-illumination and grating-based imaging (see below).