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IJFTR 12(2) 100-102
IJFTR 12(2) 100-102

... two back-scattered patterns corresponding to the ordinary and the extraordinary rays and their superposition, could give rise to diffuse patterns, as has been obtained in the present work. Also, the aniso.tropicity of the fibres leads to comparatively weak patterns. There are some limitations encoun ...
Simultaneous Negative Phase and Group Velocity of Light in a
Simultaneous Negative Phase and Group Velocity of Light in a

... the refractive index, Re(n) G 0 (see below). As expected from theory (10), we do not obtain Re(n) G 0 for the orthogonal linear polarization. To perform phase-sensitive experiments on these samples, different interferometer types can be used; for example, a Michelson interferometer or a Mach-Zehnder ...
Time-Domain Large-Signal Modeling of Traveling
Time-Domain Large-Signal Modeling of Traveling

... analysis without considering the nonlinear characteristics [2-3]; they cannot predict time-domain responses for large-signal modulations. A reliable dynamic model that reflects both linear and nonlinear responses of SiP modulators including both electrical and optical dynamics is currently missing. ...
an edge following algorithm and its application
an edge following algorithm and its application

... or light domain, typically laser source) depending on the dimensions of the scene. It can be based on time delay, phase difference or frequency deviation. The accuracy is typically high (0.1 nm) and the depth of field is in the 100 km magnitude of order. The procedure may be inexpensive or extremely ...
Examples of convex lens
Examples of convex lens

... mirror produce? How many images does two plane mirrors produce? (attached) ...
S.72-227 Digital Communication Systems
S.72-227 Digital Communication Systems

... Usually fiber systems apply amplitude modulation by pulses whose width is determined by – linewidth of the optical source – rise time of the optical source – dispersion properties of the fiber – rise time of the detector unit Assume optical power emerging from the fiber has Gaussian shape g (t )  e ...
Exp7. Birefringence in Calcite Crystals
Exp7. Birefringence in Calcite Crystals

... forward direction at the speed of light. The new wave-front is the tangential surface to all of these secondary wavelets. Before going into Calcite crystal, using Huygens principle calculate the refraction angle of the light passing from air into a medium of refraction index n at some angle, see fig ...
Birefringence dispersion in fused silica for DUV lithography
Birefringence dispersion in fused silica for DUV lithography

... where q11 and q12 are the tensor components describing the material photoelastic effect. To understand the dispersion of birefringence in the DUV we have examined the dispersion of the stress optical coefficient in Corning’s HPFS® synthetic silica glass. In a birefringent optical element the refract ...
Macular Function
Macular Function

... As a vitreoretinal surgeon, I have a different perspective on evaluating macular function and retinal risk factors in general than a cataract surgeon. The primary goal should be reducing complications by managing retinal diseases that coexist with the cataract, not only addressing informed consent i ...
Experimental characterization of the optical fiber sensors Andrei Stancalie, Gelu Ilie
Experimental characterization of the optical fiber sensors Andrei Stancalie, Gelu Ilie

... varying the distance between the source and the optical fibers. The experimental spectra have been analyzed with respect to the changes in the full width at half maximum (FWHM), in the distance from the nearest lateral lobe, the signal to noise (S/N) ratio, and the amplitude of main lobe. The optica ...
Devil`s lens optical tweezers
Devil`s lens optical tweezers

... anisotropic particles with a predominantly longitudinally polarised beam [12], or control of the trap geometry for spherical particles by shaping the focal volume [13]. An exact fractal [14] is defined as “an object which appears self-similar under varying degrees of magnification, in effect, posses ...
unable_MEMS.pdf
unable_MEMS.pdf

... single-mode laser operation.18 ECL, with optical power of up to 70 mW, are then plasma etched into the silicon on The laser is tuned by applying voltage passes through an isolator and is coupled the front surface. These cavities will to the comb elements of the MEMS actuinto a polarization-maintaini ...
EELS
EELS

... ‣One can show that the EELS is a very good approximation of the EMLD ‣EMLDOS is a very concise description of optical excitations ‣The EELS is a map of the plasmons “eigenfunction” (with some marks... ‣The STEM-EELS is a decent plasmonic counterpart of the STM for ...
Nonlinear optical responses and gap
Nonlinear optical responses and gap

... (Dated: February 8, 2008) A new approach to the nonlinear reponse of a multiplayer structure consisting of alternating dielectric materials with intensity-dependent dielectric constants is considered in both analytical and numerical viewpoints. The nonlinear feedback of the structure gives rise to a ...
optically active substances.
optically active substances.

... Variation of intensity - It may be a partially from a maximum to polarized or minimum but not zero - It may be an elliptically polarized light ...
Holography
Holography

... Theory ...
IEC TR 62778 - Lux Live 2014
IEC TR 62778 - Lux Live 2014

... Whilst flicker is a luminance-based property, one can use any input optic to perform this measurement (telescope, cosine-corrected input optic, integrating sphere) Light detection by close-match photometric detector, the output of which coupled to an amplifier and data acquisition system fast enough ...
optical flow using color information: preliminary
optical flow using color information: preliminary

... number of valid flow vectors considered after filtering. According to this criterion (Section 3.2), the use of color information can add up to 30% in the amount of valid estimated measures in comparison with methods that only use brightness information. The result in Figure 7 can be compared with th ...
Week 10 (4/20/2006)
Week 10 (4/20/2006)

... Where do pixels move to? ...
Paper Title (use style: paper title)
Paper Title (use style: paper title)

... Optical fiber communication uses light as media to convey the information. The channel used for this mode of communication is optical fiber. Earlier employed coaxial systems and Microwave transmissions had limitations over the bit rate which became the reason for evolution of optical communication, ...
Viewpoint - Complex Photonic Systems | COPS
Viewpoint - Complex Photonic Systems | COPS

... enables precise control over light propagation through complex photonic systems. At first sight, opaque disordered materials such as paper, paint, and biological tissue are completely different from lenses and other clear optical elements. In disordered materials all information in the wave front se ...
Second harmonic generation via total internal reflection quasi
Second harmonic generation via total internal reflection quasi

... Micro-cavities have attracted much attention due to their wide range of functionalities and their small size which enables dense integration. Hexagonal microcavities in particular exhibit advantageous long input/output-coupling lengths, hence the coupling gap is not limited to the sub-micron bottlen ...
Choroidal Thickness Study Using Swept
Choroidal Thickness Study Using Swept

... line. Thus, when the image is inverted, even if some resolution is lost at the vitreous and the retina, the resolution at the choroid is excellent. Swept-source (SS) OCT (DRI-OCT, Topcon) is a completely new technology that enhances the visualization of the choroid and, for the first time, enables u ...
Choroidal Thickness Study Using Swept-source
Choroidal Thickness Study Using Swept-source

... line. Thus, when the image is inverted, even if some resolution is lost at the vitreous and the retina, the resolution at the choroid is excellent. Swept-source (SS) OCT (DRI-OCT, Topcon) is a completely new technology that enhances the visualization of the choroid and, for the first time, enables u ...
WRL0294.tmp
WRL0294.tmp

... As seen earlier,  has to be real for a propagating mode. The frequency range over which  remains real therefore is important information. It can be shown that for  to be real the frequency of the wave has to be greater than certain value, called the cut-off frequency. 1. Cutoff frequency is defin ...
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Optical coherence tomography



Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three-dimensional images from within optical scattering media (e.g., biological tissue). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution.Depending on the properties of the light source (superluminescent diodes, ultrashort pulsed lasers, and supercontinuum lasers have been employed), optical coherence tomography has achieved sub- micrometer resolution (with very wide-spectrum sources emitting over a ~100 nm wavelength range).Optical coherence tomography is one of a class of optical tomographic techniques. A relatively recent implementation of optical coherence tomography, frequency-domain optical coherence tomography, provides advantages in signal-to-noise ratio, permitting faster signal acquisition. Commercially available optical coherence tomography systems are employed in diverse applications, including art conservation and diagnostic medicine, notably in ophthalmology and optometry where it can be used to obtain detailed images from within the retina. Recently it has also begun to be used in interventional cardiology to help diagnose coronary artery disease. It has also shown promise in dermatology to improve the diagnostic process.
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