Picosecond-resolution soft-x-ray laser plasma interferometry
... laser source. This limitation can be overcome if the source is placed far away from the interferometer as, according to the Huygens–Fresnel principle,12 the beam’s transverse coherence increases with the distance from the source; however, this requires an increased photon fluence. The simplest inter ...
... laser source. This limitation can be overcome if the source is placed far away from the interferometer as, according to the Huygens–Fresnel principle,12 the beam’s transverse coherence increases with the distance from the source; however, this requires an increased photon fluence. The simplest inter ...
Radiative Transfer Theory - UCL Department of Geography
... Note that the single scattering albedo for leaves is not always low. This is particularly true in the near infrared. In this case, we still need to account for further orders of scattering. The iterative method used above for the microwave case is not directly appropriate, but a range of methods exi ...
... Note that the single scattering albedo for leaves is not always low. This is particularly true in the near infrared. In this case, we still need to account for further orders of scattering. The iterative method used above for the microwave case is not directly appropriate, but a range of methods exi ...
MEMS Tunable Silicon Fabry-Perot Cavity
... Figure 6 shows the reflection spectra of one fabricated Bragg reflector and of the corresponding simulation. The overall spectral behaviors are very similar. Since reflection losses were not considered in the simulations, the experimental data present higher reflection losses compared to simulations ...
... Figure 6 shows the reflection spectra of one fabricated Bragg reflector and of the corresponding simulation. The overall spectral behaviors are very similar. Since reflection losses were not considered in the simulations, the experimental data present higher reflection losses compared to simulations ...
Apparatus and method for producing holograms with acoustic waves
... Referring now to FIGURE 3, the spatial frequency ?ected from the object. The output of the microphone on line 15 is ampli?ed ‘by ampli?er 16 and ?ltered by narrow f0 of acoustic waves incident on detection plane D'— D’ at the angle 6 is representable as in = l/Ao sin '7 band ?lter 17. The center fre ...
... Referring now to FIGURE 3, the spatial frequency ?ected from the object. The output of the microphone on line 15 is ampli?ed ‘by ampli?er 16 and ?ltered by narrow f0 of acoustic waves incident on detection plane D'— D’ at the angle 6 is representable as in = l/Ao sin '7 band ?lter 17. The center fre ...
Miscellaeous features - JLab Tech Notes Home Page
... Rayleigh range of 200 cm, and 20 kW power output at 3 µm, the magnification must be greater than 45. This means that the optical cavity must be at least 26.5 meters long. If we use multiples of the IR Demo length of 8.0104 meters, the closest one larger than this is 32.0416 meters. For this design w ...
... Rayleigh range of 200 cm, and 20 kW power output at 3 µm, the magnification must be greater than 45. This means that the optical cavity must be at least 26.5 meters long. If we use multiples of the IR Demo length of 8.0104 meters, the closest one larger than this is 32.0416 meters. For this design w ...
PowerPoint Presentation - Tip-tilt mirror and sensor configuration
... Image plane is Fourier transform of pupil plane • Leads to principle of a “spatial filter” ...
... Image plane is Fourier transform of pupil plane • Leads to principle of a “spatial filter” ...
Read Article - Cataract & Refractive Surgery Today
... capsulotomies in a matter of seconds. They also soften cataractous nuclei with customized grid patterns. Finally, dualpump phaco systems may redefine fluidics for femto-phaco procedures, thereby increasing the efficiency of removing both nuclear and cortical material. The VOS was formed to recognize ...
... capsulotomies in a matter of seconds. They also soften cataractous nuclei with customized grid patterns. Finally, dualpump phaco systems may redefine fluidics for femto-phaco procedures, thereby increasing the efficiency of removing both nuclear and cortical material. The VOS was formed to recognize ...
Objective methods of determining the patient`s refraction errors
... retina. The light moves through the front of the eye and is refracted there. The refracting power can be changed by different factors: 1. by the outside muscles, which can lead to a deformation of the whole eye ball, including the cornea/callosity, or 2. by the ciliary muscles changing the curvature ...
... retina. The light moves through the front of the eye and is refracted there. The refracting power can be changed by different factors: 1. by the outside muscles, which can lead to a deformation of the whole eye ball, including the cornea/callosity, or 2. by the ciliary muscles changing the curvature ...
Optical techniques for molecular manipulation
... • many optical elements restrict or modify the polarization state of light • polarization-dependent transmission/reflection • sheet polarizers (Polaroid) ...
... • many optical elements restrict or modify the polarization state of light • polarization-dependent transmission/reflection • sheet polarizers (Polaroid) ...
Light Propagation with Phase Discontinuities
... (C) V-antennas corresponding to mirror images of those in (B). The components of the scattered electric field perpendicular to the incident field in (B) and (C) have a p phase difference. (D and E) Analytically calculated amplitude and phase shift of the cross-polarized scattered light for V-antenna ...
... (C) V-antennas corresponding to mirror images of those in (B). The components of the scattered electric field perpendicular to the incident field in (B) and (C) have a p phase difference. (D and E) Analytically calculated amplitude and phase shift of the cross-polarized scattered light for V-antenna ...
High resolution time-resolved imaging system in the
... 100 keV (0.01 nm). The X-rays with photon energies below and higher than 10 keV (0.12 nm) are called soft and hard X-rays respectively [15]. Soft X-rays are highly absorbed in conventional visible optics while hard X-rays are penetrable in materials. The characteristics of X-rays having short wavele ...
... 100 keV (0.01 nm). The X-rays with photon energies below and higher than 10 keV (0.12 nm) are called soft and hard X-rays respectively [15]. Soft X-rays are highly absorbed in conventional visible optics while hard X-rays are penetrable in materials. The characteristics of X-rays having short wavele ...
Microscopy - Frank`s Hospital Workshop
... structures emit light no matter if they are in focus or not. This means that an image of a certain structure is always blurred by the contribution of light from structures which are out of focus. This phenomenon becomes apparent as a loss of contrast especially when using objectives with a high reso ...
... structures emit light no matter if they are in focus or not. This means that an image of a certain structure is always blurred by the contribution of light from structures which are out of focus. This phenomenon becomes apparent as a loss of contrast especially when using objectives with a high reso ...
An experimental autoimmune uveoretinitis model and intraocular
... Optical coherence tomography (OCT) is a novel method of ocular imaging. Using a coherent infrared laser to analyze the reflectance properties of the ocular structures, OCT can obtain high-resolution cross-sectional pictures.33 As a wellestablished state-of-the-art imaging tool in ophthalmology, OCT ...
... Optical coherence tomography (OCT) is a novel method of ocular imaging. Using a coherent infrared laser to analyze the reflectance properties of the ocular structures, OCT can obtain high-resolution cross-sectional pictures.33 As a wellestablished state-of-the-art imaging tool in ophthalmology, OCT ...
Superluminal and Slow Light Propagation in a Room
... ruby (20). Although our absorption (⬃1 cm⫺1) was higher than the absorption in the EIT experiments, it was several orders of magnitude lower than that in the earlier resonant systems (16). We report an observation of both ultraslow (vg ⬍⬍ c) and superluminal (vg ⬍ 0) light propagation at room temper ...
... ruby (20). Although our absorption (⬃1 cm⫺1) was higher than the absorption in the EIT experiments, it was several orders of magnitude lower than that in the earlier resonant systems (16). We report an observation of both ultraslow (vg ⬍⬍ c) and superluminal (vg ⬍ 0) light propagation at room temper ...
Measuring amplitude and phase in optical fields with
... In order to get sub-wavelength resolution in optical fields, it is crucial to probe high spatial frequencies contained in evanescent waves. To access the evanescent waves, a probe has to be brought close to the surface. “Close” or “near” means smaller than a wavelength (in contrast to “far”) because ...
... In order to get sub-wavelength resolution in optical fields, it is crucial to probe high spatial frequencies contained in evanescent waves. To access the evanescent waves, a probe has to be brought close to the surface. “Close” or “near” means smaller than a wavelength (in contrast to “far”) because ...
Imaging Properties of Laser-Produced Parabolic Profile Microlenses
... Production and application of microoptical elements is a new and fast expanding field in optics. Microoptical elements can be used in various applications like wave front sensing, diffusers, integral optics, Luneburg and geodesic lenses, arrays and waveguides [1–4]. One of the most important compone ...
... Production and application of microoptical elements is a new and fast expanding field in optics. Microoptical elements can be used in various applications like wave front sensing, diffusers, integral optics, Luneburg and geodesic lenses, arrays and waveguides [1–4]. One of the most important compone ...
keratoconjunctivitis should be sus- pected in patients who have ocular
... in case 1, described no ocular or systemic symptoms. Her visual acuity was 20/20 in both eyes, with normal visual fields and no clinical night blindness. Results of anterior biomicroscopy examination, color testing (Farnsworth dichotomous D-15), electroretinogram, and electrooculogram were normal. C ...
... in case 1, described no ocular or systemic symptoms. Her visual acuity was 20/20 in both eyes, with normal visual fields and no clinical night blindness. Results of anterior biomicroscopy examination, color testing (Farnsworth dichotomous D-15), electroretinogram, and electrooculogram were normal. C ...
High-Power Diode Lasers under External Optical Feedback
... A reduction of the laser threshold by 20 percent caused by the presence of external feedback has been reported by Takiguchi et al. [5] for 808 nm emitting devices. Hempel et al. [8] reported an emission power increase by 2.3 percent for other 808 nm emitting devices, which have originally been desig ...
... A reduction of the laser threshold by 20 percent caused by the presence of external feedback has been reported by Takiguchi et al. [5] for 808 nm emitting devices. Hempel et al. [8] reported an emission power increase by 2.3 percent for other 808 nm emitting devices, which have originally been desig ...
The Role of computer aided Diagnosis (caD) in medical Imaging
... functionally specialized responses and is the most prevalent approach to characterizing functional anatomy and diseaserelated changes. It entails the construction of spatially-extended statistical processes to test hypotheses about regionally specific effects. Resultant parametric maps are image des ...
... functionally specialized responses and is the most prevalent approach to characterizing functional anatomy and diseaserelated changes. It entails the construction of spatially-extended statistical processes to test hypotheses about regionally specific effects. Resultant parametric maps are image des ...
Optical Studies and Micro-Structure Modeling of the Circular-Polarizing Scarab Beetles Cetonia aurata
... Some scarab beetles have a metallic glossy appearance which fascinates many scientists. Already in the early 1900 [1] studies were made regarding the structuraland optical properties of some scarabs. It was found that the investigated scarabs did not get their color from pigmentation and also that s ...
... Some scarab beetles have a metallic glossy appearance which fascinates many scientists. Already in the early 1900 [1] studies were made regarding the structuraland optical properties of some scarabs. It was found that the investigated scarabs did not get their color from pigmentation and also that s ...
X = k R( ) P( )( ) d (1)
... This lab is the only lab that has established transgenic technology for butterflies [28] and is currently developing functional genetic tools in order to test the role of several candidate genes in differentiating specific colors on butterfly wings [29]. This lab has extensive experience with artifi ...
... This lab is the only lab that has established transgenic technology for butterflies [28] and is currently developing functional genetic tools in order to test the role of several candidate genes in differentiating specific colors on butterfly wings [29]. This lab has extensive experience with artifi ...
MICROSCOPY I: BRIGHT
... Since formed elements in living cells, such as chromosomes, generally have a higher refractive index than the surrounding cytoplasm, light passing through them is affected in two closely related ways: (1) the phase of the light wave is retarded, the light travels at a lesser velocity through materia ...
... Since formed elements in living cells, such as chromosomes, generally have a higher refractive index than the surrounding cytoplasm, light passing through them is affected in two closely related ways: (1) the phase of the light wave is retarded, the light travels at a lesser velocity through materia ...
full text pdf
... fabricated, to date, have mostly involved working with silk fibroin solution cast into planar photonic structures such as diffraction gratings [4]. There is emerging interest now in employing silks’ intrinsic chemical response for microfiber-based sensor geometries. Spider silks from orb-weaver spid ...
... fabricated, to date, have mostly involved working with silk fibroin solution cast into planar photonic structures such as diffraction gratings [4]. There is emerging interest now in employing silks’ intrinsic chemical response for microfiber-based sensor geometries. Spider silks from orb-weaver spid ...
Supernormal vision and high-resolution retinal imaging through
... eye’s wave aberration. The mirror consisted of an aluminized glass face plate with 37 lead zirconate-lead titanate (PZT) actuators mounted in a square array on the back surface. The stroke of the mirror beneath each actuator was 62 m m, allowing a wave-front shift of 8 mm in the reflected beam. The ...
... eye’s wave aberration. The mirror consisted of an aluminized glass face plate with 37 lead zirconate-lead titanate (PZT) actuators mounted in a square array on the back surface. The stroke of the mirror beneath each actuator was 62 m m, allowing a wave-front shift of 8 mm in the reflected beam. The ...
Introduction - Research
... unfavorable method because it forces cells to contract at a set length, which maybe more or less than the contraction range of the individual cell. Our design team, with the help of Dr. Franz Baudenbacher and several graduate students, is hoping to develop a less complicated and more accurate method ...
... unfavorable method because it forces cells to contract at a set length, which maybe more or less than the contraction range of the individual cell. Our design team, with the help of Dr. Franz Baudenbacher and several graduate students, is hoping to develop a less complicated and more accurate method ...
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.