Profile of clear corneal cataract incisions demonstrated by ocular
... METHODS: The Zeiss Visante OCT anterior segment imaging system was used to study the profile of clear corneal cataract incisions, all in senior citizens. The OCT images of the operative eye were taken on the first postoperative day approximately 24 hours after surgery. The OCT images of clear cornea ...
... METHODS: The Zeiss Visante OCT anterior segment imaging system was used to study the profile of clear corneal cataract incisions, all in senior citizens. The OCT images of the operative eye were taken on the first postoperative day approximately 24 hours after surgery. The OCT images of clear cornea ...
Quantum Optics and Photonics
... non-zero velocities and not compromising performance.11 The optical transitions involved in this process are illustrated in Figure 5a. Here, F and B are the forward and backward pumps, respectively, S is the signal; and C is the conjugate. To illustrate the mechanisms at work in this OPC, consider, ...
... non-zero velocities and not compromising performance.11 The optical transitions involved in this process are illustrated in Figure 5a. Here, F and B are the forward and backward pumps, respectively, S is the signal; and C is the conjugate. To illustrate the mechanisms at work in this OPC, consider, ...
Wavefront Technology
... The effect is that the image of each object point resembles a comet, having vertical and horizontal components. Common in patients with decentered laser ablation. • Spherical aberrations : When peripheral light rays focus in front of more central rays the effect is called spherical aberration. Comm ...
... The effect is that the image of each object point resembles a comet, having vertical and horizontal components. Common in patients with decentered laser ablation. • Spherical aberrations : When peripheral light rays focus in front of more central rays the effect is called spherical aberration. Comm ...
IV. Single photon detection
... photon counting at a temperature of 0.15K. The light source is a pulsed photodiode emitting in the near infrared (=0.78 µm). This is an ABB Hafo 1A330 device with an output power of 100 µW and a rise/fall time of 15 ns. The photodiode is placed inside the cryostat and is pulsed with an electrical s ...
... photon counting at a temperature of 0.15K. The light source is a pulsed photodiode emitting in the near infrared (=0.78 µm). This is an ABB Hafo 1A330 device with an output power of 100 µW and a rise/fall time of 15 ns. The photodiode is placed inside the cryostat and is pulsed with an electrical s ...
Preview of “ZEISS Microscopy Online ...opy Basics | Objectives”
... Such objectives are corrected for axial chromatic aberration in blue and red wavelengths, which are about 486 and 656 nanometers, respectively. Both are brought into a single common focal point. Achromatic objectives are also corrected for spherical aberration in ...
... Such objectives are corrected for axial chromatic aberration in blue and red wavelengths, which are about 486 and 656 nanometers, respectively. Both are brought into a single common focal point. Achromatic objectives are also corrected for spherical aberration in ...
Correlated diffraction and fluorescence in the backscattering
... The “birdwings” comprise some of the largest butterflies on Earth 关1兴: the wingspan of some of them, such as Ornitopthera alexandrae, can reach 30 cm. The common name of these butterflies, “birdwings,” has most probably been coined after the visual appearance of their wings, where a particular patte ...
... The “birdwings” comprise some of the largest butterflies on Earth 关1兴: the wingspan of some of them, such as Ornitopthera alexandrae, can reach 30 cm. The common name of these butterflies, “birdwings,” has most probably been coined after the visual appearance of their wings, where a particular patte ...
3 Introduction to Add
... Figure 3.3. illustrates the principle of operation for this configuration: A 3dB coupler splits light launched into port 1 and a specific wavelength, λG, is reflected by the two identical gratings. These reflected signals interfere in the 3dB coupler in such a way that the signal is dropped and the ...
... Figure 3.3. illustrates the principle of operation for this configuration: A 3dB coupler splits light launched into port 1 and a specific wavelength, λG, is reflected by the two identical gratings. These reflected signals interfere in the 3dB coupler in such a way that the signal is dropped and the ...
Aalborg Universitet Compact dipole nanoantenna coupler to plasmonic slot waveguide Andrei
... The measured coupling efficiency of the directional coupler was 70%. Combined with the silicon grating with maximal efficiency of 69% [4] the total efficiency of the whole system can be as high as 48%. However, a coupler that consists of several parts results in a large device size. The most compact ...
... The measured coupling efficiency of the directional coupler was 70%. Combined with the silicon grating with maximal efficiency of 69% [4] the total efficiency of the whole system can be as high as 48%. However, a coupler that consists of several parts results in a large device size. The most compact ...
Multiband perfect absorbers using metal
... the TE (TM) polarized light whose electric field E (magnetic field H) is perpendicular to the plane of the incidence (x-y plane). As an example, the normalized electric field profile of the second order RWMs is plotted in Fig. 1(b) for the Ag-Si-Ag structure. The number of field nodes at the dielect ...
... the TE (TM) polarized light whose electric field E (magnetic field H) is perpendicular to the plane of the incidence (x-y plane). As an example, the normalized electric field profile of the second order RWMs is plotted in Fig. 1(b) for the Ag-Si-Ag structure. The number of field nodes at the dielect ...
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... plane [27] in which the spatial resolution is reserved. However, the drawback is that relatively large particles are needed such that they can be tracked individually, which also limits the throughput required for significant statistical average. Recently, phase-sensitive methods have been employed ...
... plane [27] in which the spatial resolution is reserved. However, the drawback is that relatively large particles are needed such that they can be tracked individually, which also limits the throughput required for significant statistical average. Recently, phase-sensitive methods have been employed ...
Morphometric Analysis of Aqueous Humor Outflow Structures with
... veins or Ascher’s aqueous veins, which bypass this tortuous pathway and connect directly from SC to the episcleral veins.1,6–9 Spectral-domain optical coherence tomography (SD-OCT) and ultrasound imaging of the anterior segment have produced cross-sectional images of the drainage system, but these d ...
... veins or Ascher’s aqueous veins, which bypass this tortuous pathway and connect directly from SC to the episcleral veins.1,6–9 Spectral-domain optical coherence tomography (SD-OCT) and ultrasound imaging of the anterior segment have produced cross-sectional images of the drainage system, but these d ...
Spectral Characteristics of Semiconductor Lasers with Optical
... FI–Faraday isolator, AO– acoustooptic Bragg cell, FC–single-mode fiber coupler. ...
... FI–Faraday isolator, AO– acoustooptic Bragg cell, FC–single-mode fiber coupler. ...
`Lissajous-like` trajectories in optical tweezers
... are hydrodynamic [6–8]. Synchronisation is often observed in biological systems, such as the beating of cilia, where the importance of hydrodynamic interactions is still an open question [9, 10]. More generally, an understanding of the physics at work in low Reynolds number environments has helped o ...
... are hydrodynamic [6–8]. Synchronisation is often observed in biological systems, such as the beating of cilia, where the importance of hydrodynamic interactions is still an open question [9, 10]. More generally, an understanding of the physics at work in low Reynolds number environments has helped o ...
pdf 228KB - People.csail.mit.edu
... We calculate the deviation from our reference measurements of the photon fluence detected on the surface of the head and of the sensitivity to the brain. The results presented in this paper support our hypothesis that non-scattering CSF region can be treated with a larger scattering coefficient (0.3 ...
... We calculate the deviation from our reference measurements of the photon fluence detected on the surface of the head and of the sensitivity to the brain. The results presented in this paper support our hypothesis that non-scattering CSF region can be treated with a larger scattering coefficient (0.3 ...
Applied Fiber Optic Measurement for Geohydraulic Engineering
... experiment the influence of temperature on the system was reduced and the results indicated, that this method offers high response to pressure. The experiment was carried out with 1/21r TN cells and 3/21r twisted STN cells ([13]). The authors suggest for this gauge potential applications for pipelin ...
... experiment the influence of temperature on the system was reduced and the results indicated, that this method offers high response to pressure. The experiment was carried out with 1/21r TN cells and 3/21r twisted STN cells ([13]). The authors suggest for this gauge potential applications for pipelin ...
Persistent Hyperplastic Primary Vitreous: Magnetic Resonance
... with CT scans and has less biological side effects; it contributes to higher sensitivity and specificity in evaluating intraocular abnormalities.(2) Although Bscan ultrasonography and CT scans are easier to perform and are less expensive, the detection rate of calcifications on MR images is not as s ...
... with CT scans and has less biological side effects; it contributes to higher sensitivity and specificity in evaluating intraocular abnormalities.(2) Although Bscan ultrasonography and CT scans are easier to perform and are less expensive, the detection rate of calcifications on MR images is not as s ...
JASA_2012 - Institut Langevin
... with bulk acoustic waves, the guided waves are more suitable for long-range inspection of thin hollow cylinders. In this case, axially and circumferentially propagating guided waves must be distinguished.5 Conventional ultrasonic requires a coupling medium (liquid, gel, or rubber) for allowing the t ...
... with bulk acoustic waves, the guided waves are more suitable for long-range inspection of thin hollow cylinders. In this case, axially and circumferentially propagating guided waves must be distinguished.5 Conventional ultrasonic requires a coupling medium (liquid, gel, or rubber) for allowing the t ...
- KoreaMed Synapse
... Non-contrast CT is useful in the initial evaluation of orbital and globe trauma for the assessment of fractures, extra-ocular muscle herniation and suspected globe rupture. CT is the technique of choice for evaluating metallic or paramagnetic foreign bodies, whereas MRI is contraindicated due to pot ...
... Non-contrast CT is useful in the initial evaluation of orbital and globe trauma for the assessment of fractures, extra-ocular muscle herniation and suspected globe rupture. CT is the technique of choice for evaluating metallic or paramagnetic foreign bodies, whereas MRI is contraindicated due to pot ...
... The dynamic and deterministic control of light over space and time on the subwavelength scale is a key requirement in order to extend concepts and functionalities of macro-optics down to the nanometer scale. An increased level of control will also have fundamental implications in our understanding ...
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... between two miscible fluids; (3) an optically smooth interface can be formed between two immiscible liquids; and (4) light and sample can transfer along the same channel which allows long light–matter interaction length. These novel properties show promise to equip adaptive optical systems with more ...
... between two miscible fluids; (3) an optically smooth interface can be formed between two immiscible liquids; and (4) light and sample can transfer along the same channel which allows long light–matter interaction length. These novel properties show promise to equip adaptive optical systems with more ...
A new type of arthropod photoreceptor
... relationship with them as it is present in the same cuticular prominent plane of the head [Fig. 1(B)]. It cannot be identi®ed either with the ocelli present in Collembola, as the ocelli do not have cuticular modi®cations or accessory structures such as the hemolymph bubble. Several studies have focu ...
... relationship with them as it is present in the same cuticular prominent plane of the head [Fig. 1(B)]. It cannot be identi®ed either with the ocelli present in Collembola, as the ocelli do not have cuticular modi®cations or accessory structures such as the hemolymph bubble. Several studies have focu ...
HIGH - Electrical and Computer Engineering
... community access television (CATV) distribution systems, radio frequency (RF) phase shifters, and analog/digital microwave links [1], [2]. They are also attractive as an external modulator in wavelength division multiplexing (WDM) fiber-optic telecommunication systems [3]. Recently, electrooptic (EO ...
... community access television (CATV) distribution systems, radio frequency (RF) phase shifters, and analog/digital microwave links [1], [2]. They are also attractive as an external modulator in wavelength division multiplexing (WDM) fiber-optic telecommunication systems [3]. Recently, electrooptic (EO ...
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... time. Even when the homogeneous relaxation can be ignored, however, the number of oscillations that can be observed in an optical nutation signal is limited by damping introduced by the strong inhomogeneous dephasing which is found in most optical systems. The presence of this strong damping limits ...
... time. Even when the homogeneous relaxation can be ignored, however, the number of oscillations that can be observed in an optical nutation signal is limited by damping introduced by the strong inhomogeneous dephasing which is found in most optical systems. The presence of this strong damping limits ...
Department of Physics, Chemistry and Biology
... The attractive shiny metallic colour of some scarab beetles has made them the focus of several investigations. The colours originate from reflection of light on the cuticle [1] and understanding the structural colouration has motivated researches to closer investigate such structures. Back in the ea ...
... The attractive shiny metallic colour of some scarab beetles has made them the focus of several investigations. The colours originate from reflection of light on the cuticle [1] and understanding the structural colouration has motivated researches to closer investigate such structures. Back in the ea ...
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.