Pentacam Scheimpflug Quantitative Imaging of the
... The first Scheimpflug imaging system used for investigation of the crystalline lens in vivo was developed by Brown.2 Although Brown introduced corrections for geometrical distortion, the optical distortion did not seem to be fully corrected. Differences across studies in the reported change of anter ...
... The first Scheimpflug imaging system used for investigation of the crystalline lens in vivo was developed by Brown.2 Although Brown introduced corrections for geometrical distortion, the optical distortion did not seem to be fully corrected. Differences across studies in the reported change of anter ...
(OCT).
... Therefore, the aim of the present study is to scientifically evaluate the retinal anatomy of the raptor eye visualized using OCT, considering intra- and interspecific variations, and to validate the OCT technique comparing OCT images with histological sections. ...
... Therefore, the aim of the present study is to scientifically evaluate the retinal anatomy of the raptor eye visualized using OCT, considering intra- and interspecific variations, and to validate the OCT technique comparing OCT images with histological sections. ...
Wavelength verification of laser through varied slit widths using a
... like laser, can be determined. This is through the working equation: = . Through the CCD (charge-coupled device), the diffraction of the light was seen and using the Vision Assistant Program, the order for the destructive interference was known. The manipulated variable in this research ...
... like laser, can be determined. This is through the working equation: = . Through the CCD (charge-coupled device), the diffraction of the light was seen and using the Vision Assistant Program, the order for the destructive interference was known. The manipulated variable in this research ...
Optical safety of LED lighting
... sources, like clear filament or discharge lamps and including the sun) should be prevented. However, when people happen to look into a bright light source accidentally, a natural protective reflex occurs (people instinctively close their eyes or look away from the source). It needs ...
... sources, like clear filament or discharge lamps and including the sun) should be prevented. However, when people happen to look into a bright light source accidentally, a natural protective reflex occurs (people instinctively close their eyes or look away from the source). It needs ...
Inexpensive optical tweezers for undergraduate laboratories
... In this section, detailed selection criteria for the components of the tweezers will be discussed. With other microscopes, lasers, or wavelengths, the selection criteria will remain the same, but the specific values for the required components may be different. A. Laser There are four important char ...
... In this section, detailed selection criteria for the components of the tweezers will be discussed. With other microscopes, lasers, or wavelengths, the selection criteria will remain the same, but the specific values for the required components may be different. A. Laser There are four important char ...
Angle-independent structural colors of silicon
... show a distinctive minimum at a wavelength of 640 nm, corresponding to a normalized frequency of Λ∕λ ¼ 0.47 and a normalized height of h∕Λ ¼ 0.58, which by the simulations displayed in Figs. 2 and 3 are found to indicate a resonance anomaly behavior with strong coupling to a leaky surface wave.6 The ...
... show a distinctive minimum at a wavelength of 640 nm, corresponding to a normalized frequency of Λ∕λ ¼ 0.47 and a normalized height of h∕Λ ¼ 0.58, which by the simulations displayed in Figs. 2 and 3 are found to indicate a resonance anomaly behavior with strong coupling to a leaky surface wave.6 The ...
Measurement and correction of aberrations in light and electron
... Imperfections in image formation, called aberrations, often preclude microscopes from reaching diffraction-limited resolution. Aberrations can be caused either by the microscope itself or by the sample and can be compensated for by using an active element integrated into the beam path which is funct ...
... Imperfections in image formation, called aberrations, often preclude microscopes from reaching diffraction-limited resolution. Aberrations can be caused either by the microscope itself or by the sample and can be compensated for by using an active element integrated into the beam path which is funct ...
On Level FOCUS curriculum
... PHYSICAL SCIENCES: 2—Light has a source and travels in a direction. As a basis for understanding this concept: a. Students know sunlight can be blocked to create shadows. b. Students know light is reflected from mirrors and other surfaces. c. Students know the color of light striking an object affec ...
... PHYSICAL SCIENCES: 2—Light has a source and travels in a direction. As a basis for understanding this concept: a. Students know sunlight can be blocked to create shadows. b. Students know light is reflected from mirrors and other surfaces. c. Students know the color of light striking an object affec ...
Far-Field Optical Superlens
... optical microscope cannot resolve the line pairs due to the diffraction limit (Figure 4b). For FSL imaging, a typical image processing procedure was employed on the pattern captured by the CCD (SOM). First, the Fourier spectrum of the image at CCD was obtained. Because of a slight misalignment betwe ...
... optical microscope cannot resolve the line pairs due to the diffraction limit (Figure 4b). For FSL imaging, a typical image processing procedure was employed on the pattern captured by the CCD (SOM). First, the Fourier spectrum of the image at CCD was obtained. Because of a slight misalignment betwe ...
Combined Hamartoma of the Retina and Retinal Pigment Epithelium
... Similarly, our patient presented with an epiretinal membrane and a thickened, disorganized retina. This observation concurs with previous reports in which epiretinal membrane was a prominent clinical feature and this feature was predictive of poor visual outcome.4,5 The main ocular concern with comb ...
... Similarly, our patient presented with an epiretinal membrane and a thickened, disorganized retina. This observation concurs with previous reports in which epiretinal membrane was a prominent clinical feature and this feature was predictive of poor visual outcome.4,5 The main ocular concern with comb ...
Cameras for Stereo Panoramic Imaging - CS
... The requirement that the cylindrical optical element (e.g. as in Fig. 11) just bends the rays in the horizontal direction is accurate for rays that are in the same plane of the viewing circle. But this is only an approximation for rays that come from different vertical directions as shown in Fig. 14 ...
... The requirement that the cylindrical optical element (e.g. as in Fig. 11) just bends the rays in the horizontal direction is accurate for rays that are in the same plane of the viewing circle. But this is only an approximation for rays that come from different vertical directions as shown in Fig. 14 ...
Introduction - BYU Physics and Astronomy
... The Ru was deposited via RF magnetron sputtering using a US Inc. Mighty Mak 4-inch gun. We used a Plasmatherm 3KW RF power supply. The incident power was set to 400 W and there was 10 W of reflected power once the plasma lit. The deposition of the Ru films occurred in a high vacuum chamber. The base ...
... The Ru was deposited via RF magnetron sputtering using a US Inc. Mighty Mak 4-inch gun. We used a Plasmatherm 3KW RF power supply. The incident power was set to 400 W and there was 10 W of reflected power once the plasma lit. The deposition of the Ru films occurred in a high vacuum chamber. The base ...
Absorption Measurements in Microfluidic Devices using Ring-down Spectroscopy
... Source) was used without further purification and had an absorption coefficient of ε = ln(10) 1.6 × 105 M-1cm-1. The data acquisition rate was set to 3.33 Hz, which provided a sufficient sampling frequency for chromatographic measurements and permitted time integration over about 60,000 cycles. As s ...
... Source) was used without further purification and had an absorption coefficient of ε = ln(10) 1.6 × 105 M-1cm-1. The data acquisition rate was set to 3.33 Hz, which provided a sufficient sampling frequency for chromatographic measurements and permitted time integration over about 60,000 cycles. As s ...
Real-time phase measurement of optical vortices based on
... T. Kuga, Y. Torii, N. Shiokawa, T. Hirano, Y. Shimizu, and H. Sasada, “Novel optical trap of atoms with a doughnut beam,” Phys. Rev. Lett. 78(25), 4713–4716 (1997). H. He, M. E. J. Friese, N. R. Heckenberg, and H. Rubinsztein-Dunlop, “Direct observation of transfer of angular momentum to absorptive ...
... T. Kuga, Y. Torii, N. Shiokawa, T. Hirano, Y. Shimizu, and H. Sasada, “Novel optical trap of atoms with a doughnut beam,” Phys. Rev. Lett. 78(25), 4713–4716 (1997). H. He, M. E. J. Friese, N. R. Heckenberg, and H. Rubinsztein-Dunlop, “Direct observation of transfer of angular momentum to absorptive ...
Fiber Optic Switches
... Acronym. MEMS - Micro-electromechanical system Technology. MEMS are miniature devices fabricated with a process called micro machining. The structures range in dimensions from a few hundred microns to millimeters, and are mostly fabricated on silicon substrates, using standard semiconductor processi ...
... Acronym. MEMS - Micro-electromechanical system Technology. MEMS are miniature devices fabricated with a process called micro machining. The structures range in dimensions from a few hundred microns to millimeters, and are mostly fabricated on silicon substrates, using standard semiconductor processi ...
Introduction to Flow Cytometry: A Learning Guide
... Light scattering occurs when a particle deflects incident laser light. The extent to which this occurs depends on the physical properties of a particle, namely its size and internal complexity. Factors that affect light scattering are the cell's membrane, nucleus, and any granular material inside th ...
... Light scattering occurs when a particle deflects incident laser light. The extent to which this occurs depends on the physical properties of a particle, namely its size and internal complexity. Factors that affect light scattering are the cell's membrane, nucleus, and any granular material inside th ...
SPIE2005 5754-12-b
... The previous discussions suggest the “weak link” approach to addressing hyper-NA, where the media of lowest refractive index needs to be modified or replaced. A geometrical approach to describing the situation may not be adequate however and Snell’s law doesn’t necessarily drive the limitations. Thi ...
... The previous discussions suggest the “weak link” approach to addressing hyper-NA, where the media of lowest refractive index needs to be modified or replaced. A geometrical approach to describing the situation may not be adequate however and Snell’s law doesn’t necessarily drive the limitations. Thi ...
Modulation transfer function model of a Scophony infrared scene
... see from Eq. (6) that the spot profiles at the facet will be of finite extent. In this case the cutoff will not be abrupt; fi in Eq. (8) will be the frequency at which the center of the spot crosses the facet edge. As the modulation frequency increases , the Gaussian spot corresponding to f (dc in t ...
... see from Eq. (6) that the spot profiles at the facet will be of finite extent. In this case the cutoff will not be abrupt; fi in Eq. (8) will be the frequency at which the center of the spot crosses the facet edge. As the modulation frequency increases , the Gaussian spot corresponding to f (dc in t ...
Electronic Dispersion Compensation - ifp.illinois.edu
... providing a low-cost, simple OOK or nonreturn to zero (NRZ) modulation. While OOK is a form of linear pulse-amplitide modulation, NRZ is actually a nonlinear modulation in which the laser amplitude does not return to zero, but rather remains on when successive ones are transmitted. Figure 2 shows th ...
... providing a low-cost, simple OOK or nonreturn to zero (NRZ) modulation. While OOK is a form of linear pulse-amplitide modulation, NRZ is actually a nonlinear modulation in which the laser amplitude does not return to zero, but rather remains on when successive ones are transmitted. Figure 2 shows th ...
FABRY PEROT RESONATOR
... Mach Z. - Building instruments, Vol.12 (1892), P.89), now known as the Mach-Zehnder interferometer (Fig. 2). It has become very important in laser measuring techniques. e.g. this type of interferometer is used for laser vibrometers. ...
... Mach Z. - Building instruments, Vol.12 (1892), P.89), now known as the Mach-Zehnder interferometer (Fig. 2). It has become very important in laser measuring techniques. e.g. this type of interferometer is used for laser vibrometers. ...
Optical Properties of Aluminum Oxide
... energy resolution of 0.9 eV, determined by the full-width halfmaximum of the zero-loss peak. The beam diameter was <1 nm, and spectra were acquired while the beam was scanning an area of 6 nm × 8 nm. The convergence and collection semiangle were 10 and 13 mrad, respectively. The visual inspection of ...
... energy resolution of 0.9 eV, determined by the full-width halfmaximum of the zero-loss peak. The beam diameter was <1 nm, and spectra were acquired while the beam was scanning an area of 6 nm × 8 nm. The convergence and collection semiangle were 10 and 13 mrad, respectively. The visual inspection of ...
1 L2: Reflection and Refraction c3.L2 REFLECTION AND
... travels at the same constant speed of 3.0 108 m.s-1, which we always denote by the symbol c. However when light travels through a material its speed is always less than c. The actual value of the speed can now depend on a number of factors such as the chemical composition and the density of the ma ...
... travels at the same constant speed of 3.0 108 m.s-1, which we always denote by the symbol c. However when light travels through a material its speed is always less than c. The actual value of the speed can now depend on a number of factors such as the chemical composition and the density of the ma ...
Microscopes - Photonics Research Group
... spacings below the Sparrow criterion. Since the diameter of the Airy diffraction image is governed by NAobj and the wavelength of the image-forming light l , this resolution limit normally cannot be exceeded (for exceptions, see the sections on ‘‘Confocal Microscopy’’ and ‘‘Proximity Scanning Micros ...
... spacings below the Sparrow criterion. Since the diameter of the Airy diffraction image is governed by NAobj and the wavelength of the image-forming light l , this resolution limit normally cannot be exceeded (for exceptions, see the sections on ‘‘Confocal Microscopy’’ and ‘‘Proximity Scanning Micros ...
Optical Properties of Aluminum Oxide
... energy resolution of 0.9 eV, determined by the full-width halfmaximum of the zero-loss peak. The beam diameter was <1 nm, and spectra were acquired while the beam was scanning an area of 6 nm × 8 nm. The convergence and collection semiangle were 10 and 13 mrad, respectively. The visual inspection of ...
... energy resolution of 0.9 eV, determined by the full-width halfmaximum of the zero-loss peak. The beam diameter was <1 nm, and spectra were acquired while the beam was scanning an area of 6 nm × 8 nm. The convergence and collection semiangle were 10 and 13 mrad, respectively. The visual inspection of ...
External Cavity Mode-locked Semiconductor Lasers For
... frequency of the individual comb-lines over time periods longer than 12 minutes are shown to be significantly reduced to <100 kHz in a measurement that is limited by the linewidth of the reference source. The use of these comb sources as local oscillators in multi-heterodyne detection of arbitrary o ...
... frequency of the individual comb-lines over time periods longer than 12 minutes are shown to be significantly reduced to <100 kHz in a measurement that is limited by the linewidth of the reference source. The use of these comb sources as local oscillators in multi-heterodyne detection of arbitrary o ...
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.