Exp. 71 - Caltech
... Fabry-Perot cavities (also called Fabry-Perot etalons) are ubiquitous elements in optical physics, and they are used for such applications as sensitive wavelength discriminators, as stable frequency references, and for building up large field intensities with low input powers. Also, lasers are all ma ...
... Fabry-Perot cavities (also called Fabry-Perot etalons) are ubiquitous elements in optical physics, and they are used for such applications as sensitive wavelength discriminators, as stable frequency references, and for building up large field intensities with low input powers. Also, lasers are all ma ...
FOC-int-optics2
... DIRECTIONAL COUPLER Directional coupler is one of the very important devices which can be used for various applications like, optical amplitude modulator, power tapping, power divider, wavelength filter, optical switch, optical multiplexer, optical cross-connect and so on. Here we first develop the ...
... DIRECTIONAL COUPLER Directional coupler is one of the very important devices which can be used for various applications like, optical amplitude modulator, power tapping, power divider, wavelength filter, optical switch, optical multiplexer, optical cross-connect and so on. Here we first develop the ...
How can the reflections of light on the surface of
... In 1816, André-Marie Ampère finally released the wave theory from its deadlocked position by saying that polarization can be explained if it is assumed that light is a transverse wave instead of a longitudinal wave. It was a little weird to propose this at the time. Then, it was believed that light ...
... In 1816, André-Marie Ampère finally released the wave theory from its deadlocked position by saying that polarization can be explained if it is assumed that light is a transverse wave instead of a longitudinal wave. It was a little weird to propose this at the time. Then, it was believed that light ...
DIOPTRICS OF THE FACET LENSES OF MALE BLOWFLIES
... focal distance by measuring the radius of curvature o f front and back surfaces, together with the refractive index. A fundamental study was performed subsequently by Seitz (1968) who showed by interference microscopy that the facet lenses consist of layers of varying thickness and different refract ...
... focal distance by measuring the radius of curvature o f front and back surfaces, together with the refractive index. A fundamental study was performed subsequently by Seitz (1968) who showed by interference microscopy that the facet lenses consist of layers of varying thickness and different refract ...
Light, Mirrors, and Lenses
... to change the color of other objects, such as the walls of a room or an artist’s canvas, are called pigments. Mixing pigments together forms colors in a different way than mixing colored lights does. Like all materials that appear to be colored, pigments absorb some light waves and reflect others. T ...
... to change the color of other objects, such as the walls of a room or an artist’s canvas, are called pigments. Mixing pigments together forms colors in a different way than mixing colored lights does. Like all materials that appear to be colored, pigments absorb some light waves and reflect others. T ...
A wavelength tunable wavefront sensor for the human eye
... The light reflected in the retina is transmitted by the beam splitter and enters the measurement channel which, in its simplest version (see Fig. 1), consists of two lenses that optically conjugate the subject's pupil and the H-S microlens array, and a set of four mirrors (two of them fixed and two ...
... The light reflected in the retina is transmitted by the beam splitter and enters the measurement channel which, in its simplest version (see Fig. 1), consists of two lenses that optically conjugate the subject's pupil and the H-S microlens array, and a set of four mirrors (two of them fixed and two ...
11: Waves and Imaging
... called interference fringes. The shape, separation, and orientation of the interference fringes are determined by the incident wavefronts, and thus provide information about them. The argument of the cosine function is the optical phase difference of the two waves. At locations where the optical phas ...
... called interference fringes. The shape, separation, and orientation of the interference fringes are determined by the incident wavefronts, and thus provide information about them. The argument of the cosine function is the optical phase difference of the two waves. At locations where the optical phas ...
Development of a Total Internal Reflection Illumination System for
... Many cell surface receptors consist of multiple subunits that non-‐covalently associate to form a complete receptor. The integrin receptor is one such example. It is hypothesized that a drug (Thioridazine) ...
... Many cell surface receptors consist of multiple subunits that non-‐covalently associate to form a complete receptor. The integrin receptor is one such example. It is hypothesized that a drug (Thioridazine) ...
design and analysis of variable gain amplifier with
... on the spontaneous emission absorption energy levels method. Design and analysis of the numerical calculation of the NF and the pump power using the analytical model of an EDFA indicates that such a variable gain EDFA has an advantage over a conventional multi stage EDFA in terms of Gain variation a ...
... on the spontaneous emission absorption energy levels method. Design and analysis of the numerical calculation of the NF and the pump power using the analytical model of an EDFA indicates that such a variable gain EDFA has an advantage over a conventional multi stage EDFA in terms of Gain variation a ...
Design study of a Magneto-Optical Trap for laser cooling of rubidium
... to excited states, that correspond to wavelengths in the visible or near infra red (NIR) regions. They can also easily be generated in atomic beams. These two properties make them very suitable for cold atom experiments. Natural rubidium contains two isotopes 85 Rb (72 %) and 87 Rb (28 %). The two i ...
... to excited states, that correspond to wavelengths in the visible or near infra red (NIR) regions. They can also easily be generated in atomic beams. These two properties make them very suitable for cold atom experiments. Natural rubidium contains two isotopes 85 Rb (72 %) and 87 Rb (28 %). The two i ...
Central retinal thickness is positively correlated with
... As our MPOD and macular retinal thickness readings are comparable to other studies and because twins have been shown to be comparable to singletons in many complex traits (Andrew et al., 2001), we believe the results of this study are generalisable to healthy subjects aged 17–50 years of age. Previo ...
... As our MPOD and macular retinal thickness readings are comparable to other studies and because twins have been shown to be comparable to singletons in many complex traits (Andrew et al., 2001), we believe the results of this study are generalisable to healthy subjects aged 17–50 years of age. Previo ...
Fabrication of a Fabry–Pérot Cavity in a Microfluidic Channel Using Thermocompressive
... as robustness, high resistance to chemicals, a wide optical transmission range, and high electrical insulation. The glass substrates were first cleaned with acetone, methanol, and deionized (DI) water prior to the deposition of etch masking layers. A thin, 30-nm, Cr layer followed by a 120-nm gold l ...
... as robustness, high resistance to chemicals, a wide optical transmission range, and high electrical insulation. The glass substrates were first cleaned with acetone, methanol, and deionized (DI) water prior to the deposition of etch masking layers. A thin, 30-nm, Cr layer followed by a 120-nm gold l ...
Effect of optical basicity and energy transfer on near
... The compositions of the prepared glass were (100-x-0.1) GeO2- xLi2O- 0.1Bi2O3 (x=10, 12, 15, 18 mol%), simplified as GLB1, GLB2, GLB3, GLB4; 85GeO2-(15-y) Li2O-yYb2O3 (y=1, 1.5, 2, 3 mol%), simplified as GLY1, GLY2, GLY3, GLY4; 85GeO2-(15-0.1-x) Li2O- 0.1%Bi2O3 -x%Yb2O3 (x=1, 1.5, 2, 3 mol%), simpli ...
... The compositions of the prepared glass were (100-x-0.1) GeO2- xLi2O- 0.1Bi2O3 (x=10, 12, 15, 18 mol%), simplified as GLB1, GLB2, GLB3, GLB4; 85GeO2-(15-y) Li2O-yYb2O3 (y=1, 1.5, 2, 3 mol%), simplified as GLY1, GLY2, GLY3, GLY4; 85GeO2-(15-0.1-x) Li2O- 0.1%Bi2O3 -x%Yb2O3 (x=1, 1.5, 2, 3 mol%), simpli ...
Flatland optics - Weizmann Institute of Science
... in Fig. 6, the tilt angle ␣ ⬘ behind the prism is larger than the original angle ␣. Hence the new wavelength ⌳ ⬘ behind the prism is larger than the original ⌳. One can produce the opposite effect, ⌳ ⬘ ⬍ ⌳, simply by inverting the wedge direction of the prism. We conclude that a passive 3D component ...
... in Fig. 6, the tilt angle ␣ ⬘ behind the prism is larger than the original angle ␣. Hence the new wavelength ⌳ ⬘ behind the prism is larger than the original ⌳. One can produce the opposite effect, ⌳ ⬘ ⬍ ⌳, simply by inverting the wedge direction of the prism. We conclude that a passive 3D component ...
Beyond the Clinical Trials - Part V
... conditions are frequently encountered. The most common of these conditions is diabetic retinopathy, which is a leading cause of blindness in American adults, thanks in part to diabetic macular edema (DME). Because the incidence and prevalence of this systemic disease are on the rise, retinal physici ...
... conditions are frequently encountered. The most common of these conditions is diabetic retinopathy, which is a leading cause of blindness in American adults, thanks in part to diabetic macular edema (DME). Because the incidence and prevalence of this systemic disease are on the rise, retinal physici ...
Fiber optic devices and systems
... manufactured the first low loss fiber with attenuation less than 20dB/km. The applications of optical fiber at the present moment may be classified into four categories: (1) telecommunication, (2) sensing, (3) medical, and (4) illumination. Among these, the telecommunication industry uses most of th ...
... manufactured the first low loss fiber with attenuation less than 20dB/km. The applications of optical fiber at the present moment may be classified into four categories: (1) telecommunication, (2) sensing, (3) medical, and (4) illumination. Among these, the telecommunication industry uses most of th ...
Quantitative prediction of the modulation behavior of twisted nematic liquid
... measurements for these three experimental configurations at four different wavelengths (633 nm from a He-Ne laser, and 514 nm, 488 nm and 458 nm from an Ar laser). As described in ref. [16] in our fit of the experimental data, we look for the set of values of β(V) and δ(V) that minimizes the square ...
... measurements for these three experimental configurations at four different wavelengths (633 nm from a He-Ne laser, and 514 nm, 488 nm and 458 nm from an Ar laser). As described in ref. [16] in our fit of the experimental data, we look for the set of values of β(V) and δ(V) that minimizes the square ...
Three-dimensional photon confinement in photonic low-dimensional periodicity of crystals
... The slab is shown in Fig. I. Its corresponding &spasion relation is shown in Fig. 2. The solid lines carrespond to guided modes; the shaded region corresponds to the continuum of radiation (i.e. nonguided) modes. The guided modes are labelled even and odd with r e s p t to the horizontd plane of sym ...
... The slab is shown in Fig. I. Its corresponding &spasion relation is shown in Fig. 2. The solid lines carrespond to guided modes; the shaded region corresponds to the continuum of radiation (i.e. nonguided) modes. The guided modes are labelled even and odd with r e s p t to the horizontd plane of sym ...
Document
... ★The refractive index, and consequently the speed of light in an optical medium, does change with the light intensity. ★ The principle of superposition is violated. ★ Light can alter its frequency as it passes through a nonlinear optical material (e.g., from red to blue!). ★ Light can control light; ...
... ★The refractive index, and consequently the speed of light in an optical medium, does change with the light intensity. ★ The principle of superposition is violated. ★ Light can alter its frequency as it passes through a nonlinear optical material (e.g., from red to blue!). ★ Light can control light; ...
Injuries of the Globe: What Can the Radiologist Offer?1
... and a pitch of 0.969. Images are reconstructed in soft tissue and bone kernels in both axial and coronal planes. Iterative reconstruction techniques are applied for further dose reduction, with resulting CT dose index values of 20 mGy or less. CT protocols vary among institutions, and optimal imagin ...
... and a pitch of 0.969. Images are reconstructed in soft tissue and bone kernels in both axial and coronal planes. Iterative reconstruction techniques are applied for further dose reduction, with resulting CT dose index values of 20 mGy or less. CT protocols vary among institutions, and optimal imagin ...
Laser and nonlinear optics
... where tp is the pulse duration and ∆ν is the full width at half maximum. Nonlinear processes in the components of the resonator due to the high peak intensities of the laser pulses or insufficient modulation depth of the AOM such as dispersion can lead to deviations from this ideal value. For mode-l ...
... where tp is the pulse duration and ∆ν is the full width at half maximum. Nonlinear processes in the components of the resonator due to the high peak intensities of the laser pulses or insufficient modulation depth of the AOM such as dispersion can lead to deviations from this ideal value. For mode-l ...
Different Types of Dispersions in an Optical Fiber
... Graded index fibers have core diameter of 50, 62.5 or 85 m and a cladding diameter of 125 m. The fiber is used in applications requiring a wide bandwidth and low model dispersion. The number of modes in the fiber is about half that of step index fiber having the same diameter. Single mode step ind ...
... Graded index fibers have core diameter of 50, 62.5 or 85 m and a cladding diameter of 125 m. The fiber is used in applications requiring a wide bandwidth and low model dispersion. The number of modes in the fiber is about half that of step index fiber having the same diameter. Single mode step ind ...
Wave optical simulations of x-ray nano
... There exist sources that diminish some of these variations; conventional lasers can produce stable beams on the seconds-scale, seeded free electron lasers are proposed as sources with comparable properties. In this work we will not discuss such “perfect” sources, but confine to “classical”, noisy so ...
... There exist sources that diminish some of these variations; conventional lasers can produce stable beams on the seconds-scale, seeded free electron lasers are proposed as sources with comparable properties. In this work we will not discuss such “perfect” sources, but confine to “classical”, noisy so ...
Ultra-Wide–Field Green-Light (532-nm) Autofluorescence Imaging in
... lack of longitudinal data. It is not yet known how these FAF patterns evolve over time and whether changes in FAF patterns may be used as a reliable marker of disease progression. In addition, the abnormalities identified in this study are based on scanning laser ophthalmoscope green-light autofluor ...
... lack of longitudinal data. It is not yet known how these FAF patterns evolve over time and whether changes in FAF patterns may be used as a reliable marker of disease progression. In addition, the abnormalities identified in this study are based on scanning laser ophthalmoscope green-light autofluor ...
Note
... The radii of the secondary wavelets are vt , where v is the speed of light in the medium. If the medium is inhomogeneous, then some wavelets expand faster than others, and the wave profile changes. c. Huygens’ construction The new wave front is constructed by drawing circles of radius vt , each ce ...
... The radii of the secondary wavelets are vt , where v is the speed of light in the medium. If the medium is inhomogeneous, then some wavelets expand faster than others, and the wave profile changes. c. Huygens’ construction The new wave front is constructed by drawing circles of radius vt , each ce ...
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.