Compact Adaptive Optics Line Scanning Ophthalmoscope
... and the desired input beam diameter at the pupil. The input beam diameter was set to 7.5 mm to achieve high lateral resolution for a dilated pupil with minimization of ocular aberrations. The magnification from the LAD to the retina is 6.4 and so the field size on the retina is 1.6 mm (5.5 deg for a ...
... and the desired input beam diameter at the pupil. The input beam diameter was set to 7.5 mm to achieve high lateral resolution for a dilated pupil with minimization of ocular aberrations. The magnification from the LAD to the retina is 6.4 and so the field size on the retina is 1.6 mm (5.5 deg for a ...
Deep subsurface optical waveguides produced by direct writing with
... positively chirped ones) does not lead to an improvement of circularity. Although at present we do not have a conclusive explanation for this preliminary result, the use of the chirped pulses has already been shown to increase the ablation efficiency in dielectrics [11]. However, in that case the ef ...
... positively chirped ones) does not lead to an improvement of circularity. Although at present we do not have a conclusive explanation for this preliminary result, the use of the chirped pulses has already been shown to increase the ablation efficiency in dielectrics [11]. However, in that case the ef ...
All-dielectric subwavelength metasurface focusing lens
... of the pillar structures must be less than the structure cutoff scale, λ0/n, where λ0 is the wavelength in free space, and n is the refractive index of the substrate. For the case of 1.55 μm incident light with a silicon substrate, the pillar periodicity should be less than about 445 nm (here, 440 n ...
... of the pillar structures must be less than the structure cutoff scale, λ0/n, where λ0 is the wavelength in free space, and n is the refractive index of the substrate. For the case of 1.55 μm incident light with a silicon substrate, the pillar periodicity should be less than about 445 nm (here, 440 n ...
RAY OPTICS
... All paraxial rays originating from each point on the axis of a spherical mirror are reflected and focused onto a single corresponding point on the axis. This can be seen (Fig. 1.2-6) by examining a ray emitted at an angle 0, from a point Pi at a distance zi away from a concave mirror of radius R, an ...
... All paraxial rays originating from each point on the axis of a spherical mirror are reflected and focused onto a single corresponding point on the axis. This can be seen (Fig. 1.2-6) by examining a ray emitted at an angle 0, from a point Pi at a distance zi away from a concave mirror of radius R, an ...
2004 - thephysicsteacher.ie
... Optical fibres are made of very transparent glass or plastic. The fibres contain at least two layers. Guiding light in an optical fibre depends on how light travels through different media. Light waves are bent, or refracted, as they pass between materials of different refractive index. The amount o ...
... Optical fibres are made of very transparent glass or plastic. The fibres contain at least two layers. Guiding light in an optical fibre depends on how light travels through different media. Light waves are bent, or refracted, as they pass between materials of different refractive index. The amount o ...
Cloaking at Optical Frequencies - Cornell ECE
... operating in the optical regime. The cloak operates at a wide bandwidth and conceals a deformation on a flat reflecting surface, under which an object can be hidden. The device is composed of nanometer size silicon structures with spatially varying densities across the cloak. The density variation i ...
... operating in the optical regime. The cloak operates at a wide bandwidth and conceals a deformation on a flat reflecting surface, under which an object can be hidden. The device is composed of nanometer size silicon structures with spatially varying densities across the cloak. The density variation i ...
FarahWaheedaAhmadWahiddinMFKE2007TTTCHAP1
... splitters, combiners, mode converters, filters, and routers. They can also be easily fabricated in more complex PICs such as ring lasers, optical modulators, MZI (Mach-Zehnder interferometer) switches, dense wavelength multiplexers, and wavelength converters. ...
... splitters, combiners, mode converters, filters, and routers. They can also be easily fabricated in more complex PICs such as ring lasers, optical modulators, MZI (Mach-Zehnder interferometer) switches, dense wavelength multiplexers, and wavelength converters. ...
diffraction uniformly illuminated circular aperture
... If a small hole in an opaque screen is placed between a light source and an observation screen then the shadow of the hole does not have a sharp outline as predicted by geometrical optics. On close examination of the shadow on the observation screen, a set of bright and dark fringes around a central ...
... If a small hole in an opaque screen is placed between a light source and an observation screen then the shadow of the hole does not have a sharp outline as predicted by geometrical optics. On close examination of the shadow on the observation screen, a set of bright and dark fringes around a central ...
Amplitude and Phase of Tightly Focused Laser Beams in Turbid Media
... 0:1913 m are chosen to match the experimentally determined first moment of the angular distribution function g ¼ 0:636. These properties result in a scattering mean free path ls ¼ 36:6 m and a transport mean free path l ¼ 100 m. We consider a water-immersion objective lens with numerical apertur ...
... 0:1913 m are chosen to match the experimentally determined first moment of the angular distribution function g ¼ 0:636. These properties result in a scattering mean free path ls ¼ 36:6 m and a transport mean free path l ¼ 100 m. We consider a water-immersion objective lens with numerical apertur ...
Tomographic Interference Microscopy of Living Cells
... ART algorithm, HG(n) is an operator in Fourier space, which changes the 3D Fourier transform according to the central slice theorem [14]; ⌽s and ⌽f are operators for a-priori information in spatial and frequency domain; and F is an operator for 3D Fourier transform. In our case the operator ⌽f has b ...
... ART algorithm, HG(n) is an operator in Fourier space, which changes the 3D Fourier transform according to the central slice theorem [14]; ⌽s and ⌽f are operators for a-priori information in spatial and frequency domain; and F is an operator for 3D Fourier transform. In our case the operator ⌽f has b ...
www.slac.stanford.edu
... Figure 7 shows the scanner. The mirrors are 30 mm x 30 mm; the stiff wire supports act as torsional springs, and the mirrors oscillate torsionally at 100 Hz. The two mirrors oscillate 180° out of phase so that very little vibration is transmitted to the base. The oscillatory motion is picked up with ...
... Figure 7 shows the scanner. The mirrors are 30 mm x 30 mm; the stiff wire supports act as torsional springs, and the mirrors oscillate torsionally at 100 Hz. The two mirrors oscillate 180° out of phase so that very little vibration is transmitted to the base. The oscillatory motion is picked up with ...
(19) United States
... a perspective camera has an effective single vieWpoint if dV is same for all angles 0. This occurs only if a hyperboloid or ellipsoidal minor is used With a perspective camera placed on one of the tWo foci of the minor. The other focus of the minor ...
... a perspective camera has an effective single vieWpoint if dV is same for all angles 0. This occurs only if a hyperboloid or ellipsoidal minor is used With a perspective camera placed on one of the tWo foci of the minor. The other focus of the minor ...
Lecture8 - UMD Physics
... larger than the critical angle, it is totally internally reflected: No loss of light from escaping! Thus the light can be used to transmit information through the optical fibers. ...
... larger than the critical angle, it is totally internally reflected: No loss of light from escaping! Thus the light can be used to transmit information through the optical fibers. ...
Spectrum of spatial frequency of terahertz vortex Bessel beams formed using phase plates with spiral zones
... of the Novosibirsk free electron laser I : exp(2r 2 / w2 ) with w = 15.1 mm. The radiation intensity distribution along the Bessel beam and in the area behind a TPX lens with a focal length of 50 mm or 100 mm was recorded with a microbolometer array (MBA) as a video at 20 frames per second. The MBA ...
... of the Novosibirsk free electron laser I : exp(2r 2 / w2 ) with w = 15.1 mm. The radiation intensity distribution along the Bessel beam and in the area behind a TPX lens with a focal length of 50 mm or 100 mm was recorded with a microbolometer array (MBA) as a video at 20 frames per second. The MBA ...
Optical aberration
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An optical aberration is a departure of the performance of an optical system from the predictions of paraxial optics. In an imaging system, it occurs when light from one point of an object does not converge into (or does not diverge from) a single point after transmission through the system. Aberrations occur because the simple paraxial theory is not a completely accurate model of the effect of an optical system on light, rather than due to flaws in the optical elements.Aberration leads to blurring of the image produced by an image-forming optical system. Makers of optical instruments need to correct optical systems to compensate for aberration.The articles on reflection, refraction and caustics discuss the general features of reflected and refracted rays.