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Optimal pupil size in the human eye for axial resolution
Optimal pupil size in the human eye for axial resolution

Fiber Waveguide
Fiber Waveguide

... change at the core–cladding interface, such fibers are called step-index fibers. In a different type of fiber, known as graded-index fiber, the refractive index decreases gradually inside the core. Considerable insight in the guiding properties of optical fibers can be gained by using a ray picture ...
Statistics of the received power for free space optical channels
Statistics of the received power for free space optical channels

Analysis And Design Of Wide-angle Foveated Optical
Analysis And Design Of Wide-angle Foveated Optical

... lenses. The fundamental concept behind optical foveated imaging is reducing the number of elements in a fast wide-angle lens by placing a phase SLM at the pupil stop to dynamically compensate aberrations left uncorrected by the optical design. ...
pdf file
pdf file

... collimated by a combination of a convex lens and an achromatic lens to ensure that the full area of the ZnTe crystal was being used. The pump beam was also expanded and collimated before incidence at the emitter. The energy of the pump pulse was 150 µJ. The spatial distribution of the pumping intens ...
Light Microscopy
Light Microscopy

... i.e. flat-field correction, and K (compensating for residual objective aberrations) can sometimes be found. W usually means wide-field (unnecessary information if you have the field-of-view number). A real microscope is considerably more complicated than those illustrated in Figs. 1 and 2. First, bo ...
INVESTIGATION OF INJECTION MOLDING PROCESS FOR HIGH
INVESTIGATION OF INJECTION MOLDING PROCESS FOR HIGH

... process has not been readily accepted in precision optical fabrication industry because several difficult issues such as geometry deviation, inhomogeneous index distribution, birefringence and freeform fabrication have hindered the implementation of injection molding process in high precision optica ...
Full-Text PDF
Full-Text PDF

Modern Optical Engineering
Modern Optical Engineering

Sample pages 1 PDF
Sample pages 1 PDF

... the effects of partial source coherence can always be modelled as a simple convolution of the image with the effective source size. The purpose of condenser lenses is to demagnify the electron source as much as possible to reduce the deleterious effects of partial source coherence. The more the sour ...
Flexure Mounts For High Resolution Optical Elements
Flexure Mounts For High Resolution Optical Elements

... Should have high fracture toughness Thermal properties to maintain operation with temperature change ...
Zemax, LLC Getting Started With OpticStudio 16
Zemax, LLC Getting Started With OpticStudio 16

... software, the Zemax License Manager (ZLM). A dialog box may also ask for your permission to modify the firewall settings of your computer to allow remote users of your computer to run OpticStudio using Remote Desktop. If you want to authorize this, click "Yes", otherwise click "No". To change this s ...
d - s3.amazonaws.com
d - s3.amazonaws.com

Measurement of the THz emission from a femtosecond laser filament
Measurement of the THz emission from a femtosecond laser filament

... spectral range > 1 THz, we include in the calculations a corresponding correction based on measurements of the water absorption spectrum made by Xin et al. 9, considering 40 % humidity and a path of 25 cm for the THz. From the best fit of g(ν) we extract the percent of energy for each filter and the ...
Physical Optics
Physical Optics

Effective Area of Optical Fibres
Effective Area of Optical Fibres

... Nonlinear effects occur more efficiently in optical fibres than in bulk samples of their constituent materials because the optical field is confined to the small fibre core area over long distances. The confinement of the optical field within the core is achieved by the refractive index profile, whi ...
Achromatic correction of diffractive dispersion in white light SLM
Achromatic correction of diffractive dispersion in white light SLM

diffraction gratings
diffraction gratings

... 1. An entrance slit or aperture stop. 2. A collimating element to make the rays parallel which pass though one point of the entrance slit or field-stop. This collimator may be a lens, a mirror or an integral part of the dispersing element, as in a concave grating spectrometer. 3. A dispersing elemen ...
IMPORTANT FEATURES FOR A RIGHT - pi
IMPORTANT FEATURES FOR A RIGHT - pi

Wave-front sensing from defocused images by use
Wave-front sensing from defocused images by use

Confocal optical microscopy
Confocal optical microscopy

Assessment of optical systems by means of point
Assessment of optical systems by means of point

... of the wavelength of the light. Interferometric methods are mostly used for this purpose. Although the achievable precision is very high, these methods need refined and delicate optical set-ups and, in practice, special laser sources to achieve sufficient signal-to-noise ratio. When a measurement at ...
About the reduction of reflections for camera lenses How T
About the reduction of reflections for camera lenses How T

Application of nonperiodic phase structures in
Application of nonperiodic phase structures in

... In this paper we show that the concept of a NPS can be used more generally to partly compensate for aberrations of optical systems when we correctly choose the initial step heights and step widths of the NPS. Two different classes of aberration correction with such a NPS are studied. The first class ...
Propagation and focusing of optical fields
Propagation and focusing of optical fields

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F-number



In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. The number is commonly notated using a hooked f, i.e. f/N, where N is the f-number.
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