Fourier-Space Image Restoration Ronald R. Parenti
... In the limit that the characteristic correlation length of the scene is much larger than the dimensions of a sample element (i.e., Po » Ppix) we can assume that Fn(f,) "" Fn(O). When this result is combined with the power spectral density function given in Equation 10, the frequency-dependent signal ...
... In the limit that the characteristic correlation length of the scene is much larger than the dimensions of a sample element (i.e., Po » Ppix) we can assume that Fn(f,) "" Fn(O). When this result is combined with the power spectral density function given in Equation 10, the frequency-dependent signal ...
An Introduction to Optical Window Design
... area of optical window design. Several design considerations and typical specifications for optical windows and their mounting are discussed. Several examples taken from literature are referenced and used to illustrate modern optical window design. Mathematical models used for design of pressure rat ...
... area of optical window design. Several design considerations and typical specifications for optical windows and their mounting are discussed. Several examples taken from literature are referenced and used to illustrate modern optical window design. Mathematical models used for design of pressure rat ...
A simple peak-to-average power ratio reduction
... shifter array and an optical delay line array, proposed by Kyusang Lee [4]. The main idea of this scheme is to divide the overall discrete Fourier transformation (DFT) into multiple phase-shifting and optical delay operations. In this kind of ODFT, the phase-shiftings are implemented by phase shift ...
... shifter array and an optical delay line array, proposed by Kyusang Lee [4]. The main idea of this scheme is to divide the overall discrete Fourier transformation (DFT) into multiple phase-shifting and optical delay operations. In this kind of ODFT, the phase-shiftings are implemented by phase shift ...
Optical Solitons with Fourth Order Dispersion and Dual
... to be studied with the inclusion of the fourth order dispersion (4OD) term in a dual-power law media [2, 9]. The NLSE does not give correct prediction for pulse widths smaller than 1 picosecond. For example, in solid state solitary lasers, where pulses as short as 10 femtoseconds are generated, the ...
... to be studied with the inclusion of the fourth order dispersion (4OD) term in a dual-power law media [2, 9]. The NLSE does not give correct prediction for pulse widths smaller than 1 picosecond. For example, in solid state solitary lasers, where pulses as short as 10 femtoseconds are generated, the ...
RESONANCE WAVELENGTH DEPENDENCE AND MODE
... etc. . . ) and patterned nanoparticle arrays with different period have also been thoroughly investigated [36–39]. The design of an optical nanoantenna requires great attention since the conventional radiofrequency and microwave design rules that describe antenna parameters as a function of the oper ...
... etc. . . ) and patterned nanoparticle arrays with different period have also been thoroughly investigated [36–39]. The design of an optical nanoantenna requires great attention since the conventional radiofrequency and microwave design rules that describe antenna parameters as a function of the oper ...
JMacePaper.doc
... Without a doubt, everyone has heard about lasers, and while the first thing that comes to mind at the mention of the word can be anything from some sort of death ray to a doctor performing eye surgery, their infusion into society is certainly very deep. However, the average layman may not be all tha ...
... Without a doubt, everyone has heard about lasers, and while the first thing that comes to mind at the mention of the word can be anything from some sort of death ray to a doctor performing eye surgery, their infusion into society is certainly very deep. However, the average layman may not be all tha ...
Rays and Optical beams
... In geometrical optics, the propagation of optical waves can be described approximately by using the concept of rays. This is valid provided the beam diameter is much larger than the wavelength and the diffraction can be neglected. The rays travel in straight lines in homogeneous media and obey Ferma ...
... In geometrical optics, the propagation of optical waves can be described approximately by using the concept of rays. This is valid provided the beam diameter is much larger than the wavelength and the diffraction can be neglected. The rays travel in straight lines in homogeneous media and obey Ferma ...
Skin Perfusion Photography
... Rege et al. suggest anisotropic numerical processing for increased SNR [26]. Our global-direct separation improves skin perfusion maps and can be integrated with these methods with, e.g., a high-speed camera or projector. Skin perfusion analysis via LSCI was suggested by Briers [4]. A similar system ...
... Rege et al. suggest anisotropic numerical processing for increased SNR [26]. Our global-direct separation improves skin perfusion maps and can be integrated with these methods with, e.g., a high-speed camera or projector. Skin perfusion analysis via LSCI was suggested by Briers [4]. A similar system ...
Intersatellite laser ranging instrument for the GRACE
... an accelerometer (Touboul et al. 1999) placed at the spacecraft center of mass which is used to correct for range changes caused by non-gravitational forces acting on the satellites, primarily drag forces from the residual atmosphere and solar radiation. Attitude information obtained from the on-boa ...
... an accelerometer (Touboul et al. 1999) placed at the spacecraft center of mass which is used to correct for range changes caused by non-gravitational forces acting on the satellites, primarily drag forces from the residual atmosphere and solar radiation. Attitude information obtained from the on-boa ...
self-study - Technion moodle
... greatly improve system performance. By 1987, these systems were operating at bit rates of up to 1.7 Gb/s with repeater spacing up to 50 km. ...
... greatly improve system performance. By 1987, these systems were operating at bit rates of up to 1.7 Gb/s with repeater spacing up to 50 km. ...
Improved Theoretical Reflectivities of Extreme Ultraviolet Mirrors
... locations in the stack. In the Mo/Sr-Si system, Sr was introduced into the standard stack just in the 15 periods near the surface. Strontium, with high n and low k (Table 1), acts predominantly like a "spacer" and partially substitutes for Si as can be seen in the abrupt transition in the Si layer p ...
... locations in the stack. In the Mo/Sr-Si system, Sr was introduced into the standard stack just in the 15 periods near the surface. Strontium, with high n and low k (Table 1), acts predominantly like a "spacer" and partially substitutes for Si as can be seen in the abrupt transition in the Si layer p ...
Nonlocal Labeling of Paths in a Single-Photon Interferometer
... The preparation of these last two cases is shown in Fig. 4. Notice that it involves the same components but with different values of ␣. It is interesting to consider the local erasure probability for these two cases when P2 is present. The probability can be shown to be given by ...
... The preparation of these last two cases is shown in Fig. 4. Notice that it involves the same components but with different values of ␣. It is interesting to consider the local erasure probability for these two cases when P2 is present. The probability can be shown to be given by ...
PCT form - 1 - DESCRIPTION OPTICAL MEASURING DEVICE AND
... of, for example, protein and various minute particles) by using light diffracted by a transient diffraction grating generated by the particles and to a method and device for measuring diameters of nanoparticles whose diameters are equal to or less than 100nm by using the same principle as ...
... of, for example, protein and various minute particles) by using light diffracted by a transient diffraction grating generated by the particles and to a method and device for measuring diameters of nanoparticles whose diameters are equal to or less than 100nm by using the same principle as ...
Chapter 8
... a = kz-t, the resultant wave is right-circularly polarized (rotate clockwise). 2) When E0x=E0y=E0, = p /2 , E( z, t ) E0 [iˆ cos(kz t ) ˆj sin( kz t )] a = -kz +t, the resultant wave is left-circularly polarized (rotate counterclockwise). Circular light: i)The amplitude E0 does not cha ...
... a = kz-t, the resultant wave is right-circularly polarized (rotate clockwise). 2) When E0x=E0y=E0, = p /2 , E( z, t ) E0 [iˆ cos(kz t ) ˆj sin( kz t )] a = -kz +t, the resultant wave is left-circularly polarized (rotate counterclockwise). Circular light: i)The amplitude E0 does not cha ...
Theory of electro-optic modulation via a quantum dot coupled to a
... When operating as a modulator, the cavity/QD system modulates the transmission of the laser driving the cavity (laser amplitude E and frequency ωl ). The system is modulated using an electrical signal which changes the QD resonance frequency via quantum confined Stark effect (QCSE). In our analysis, ...
... When operating as a modulator, the cavity/QD system modulates the transmission of the laser driving the cavity (laser amplitude E and frequency ωl ). The system is modulated using an electrical signal which changes the QD resonance frequency via quantum confined Stark effect (QCSE). In our analysis, ...
Plasmonic Nanopore for Electrical Profiling of
... demonstrated by an excellent correspondence between experimental results and theoretical calculations. The high dynamic range and signal-to-noise ratio is due to the fact that the total signals (∼10 nA at 10 mW laser power) are 3−4 orders of magnitude higher than the noise level of typical nanopores ...
... demonstrated by an excellent correspondence between experimental results and theoretical calculations. The high dynamic range and signal-to-noise ratio is due to the fact that the total signals (∼10 nA at 10 mW laser power) are 3−4 orders of magnitude higher than the noise level of typical nanopores ...
Pigment dispersion syndrome
... We report of the rare occurrence of pigment dispersion syndrome (PDS) with posterior subcapsular cataract in both eyes in a young male patient. The patient presented with complaints of progressive decrease in vision of one year duration. The patient also had high myopia with mild iridodonesis, phaco ...
... We report of the rare occurrence of pigment dispersion syndrome (PDS) with posterior subcapsular cataract in both eyes in a young male patient. The patient presented with complaints of progressive decrease in vision of one year duration. The patient also had high myopia with mild iridodonesis, phaco ...
the fresnel diffraction: a story of light and darkness
... Figure 3. We describes further in the paper how the operation of Fourier transform can be made optically. As one increases the distance z, the fringes in the images almost disappear and appear again periodically with the same original contrast. A careful observation makes it possible to observe an i ...
... Figure 3. We describes further in the paper how the operation of Fourier transform can be made optically. As one increases the distance z, the fringes in the images almost disappear and appear again periodically with the same original contrast. A careful observation makes it possible to observe an i ...
Characterizing a single photon detector
... by sending a laser to a special kind of crystal, two photons will enter, but one will leave. This results in a doubling of energy thus a doubling of frequency and a halving of wavelength. This is necessary for our experiment because our MPPC APD operates at 775nm, which is approximatel ...
... by sending a laser to a special kind of crystal, two photons will enter, but one will leave. This results in a doubling of energy thus a doubling of frequency and a halving of wavelength. This is necessary for our experiment because our MPPC APD operates at 775nm, which is approximatel ...
Magneto-Optic Kerr Effect
... Lasers are typically used for MOKE experiments. When lasers are used with PEMs an effect called “modulated interference” may be present.4 Since the MOKE AC signals are typically very weak, great care must be taken to eliminate or reduce these effects. Useful techniques include: 1) use of anti-reflec ...
... Lasers are typically used for MOKE experiments. When lasers are used with PEMs an effect called “modulated interference” may be present.4 Since the MOKE AC signals are typically very weak, great care must be taken to eliminate or reduce these effects. Useful techniques include: 1) use of anti-reflec ...
Investigation of ultrafast demagnetization and cubic optical
... beams had angles of incidence of 4° and 26°, respectively, and average powers of 200 mW and 4 mW, respectively. Both beams were focused to a diameter of about 15 m on the surface of the sample. The resulting pump fluence of about 1.4 mJ/cm2 lies within the regime where the magnetooptical response i ...
... beams had angles of incidence of 4° and 26°, respectively, and average powers of 200 mW and 4 mW, respectively. Both beams were focused to a diameter of about 15 m on the surface of the sample. The resulting pump fluence of about 1.4 mJ/cm2 lies within the regime where the magnetooptical response i ...
Coupling to aeroGAIN-ROD fibers
... damage and reflections, and should be handled with great care using gloves and making sure not to touch the end facets. The ROD fiber can also be delivered with one or two angled AR coated end-caps in order to have a further reduction in reflections. In the setup, the aeroGAIN-ROD should be supporte ...
... damage and reflections, and should be handled with great care using gloves and making sure not to touch the end facets. The ROD fiber can also be delivered with one or two angled AR coated end-caps in order to have a further reduction in reflections. In the setup, the aeroGAIN-ROD should be supporte ...
Spontaneous, stimulated, coherent and incoherent nonlinear wave
... initially in the vacuum state. The next layer of classification is into coherent, where the signal has a well defined phase with respect to the driving fields, or incoherent where no such phase relation exists. Stimulated signals are coherent, scale as ∼ N and the field itself (both amplitude and phase) ...
... initially in the vacuum state. The next layer of classification is into coherent, where the signal has a well defined phase with respect to the driving fields, or incoherent where no such phase relation exists. Stimulated signals are coherent, scale as ∼ N and the field itself (both amplitude and phase) ...
Structure and Imaging of a Transmission Electron Microscope (TEM)
... 1967) were developed. The brightness of the LaB6 cathode is about 106 A/cm2sr. In the 1990s, these were intensively used for high-resolution TEM. However, STEM imaging at atomic resolution needs a higher brightness gun, that is, a field emission gun (FEG). In the FEG in Fig. 2.2b, an extraction volta ...
... 1967) were developed. The brightness of the LaB6 cathode is about 106 A/cm2sr. In the 1990s, these were intensively used for high-resolution TEM. However, STEM imaging at atomic resolution needs a higher brightness gun, that is, a field emission gun (FEG). In the FEG in Fig. 2.2b, an extraction volta ...
A Carpet Cloak Device for Visible Light
... that silicon oxide substrate index fails to provide enough contrast for waveguiding at visible frequencies. To accomplish the required index contrast, we consider a silicon nitride (SiN) waveguide on a specially developed low index substrate made from nano-porous silicon oxide. The inset in Figure 1 ...
... that silicon oxide substrate index fails to provide enough contrast for waveguiding at visible frequencies. To accomplish the required index contrast, we consider a silicon nitride (SiN) waveguide on a specially developed low index substrate made from nano-porous silicon oxide. The inset in Figure 1 ...
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.