Results 231 to 240 of about 60,075 (261)
Some of the next articles are maybe not open access.
Image Formation in Microscopy at High Numerical Aperture
Optica Acta: International Journal of Optics, 1965Experiments are described which illustrate the effect of aberrations of the objective, working at high numerical aperture, on the diffraction images of circular apertures in an opaque film. Measurements of the diffraction image of a straight opaque edge at high numerical apertures, in polarized and non-polarized light, show the breakdown of the scalar ...
openaire +2 more sources
Effective numerical aperture of antiresonant hollow core fibers
Optics LettersWe present an analytical framework for characterizing the light coupling behavior of antiresonant hollow core fibers (AR-HCFs) through the introduction of an effective numerical aperture. This concept is particularly relevant for few-mode AR-HCFs, which are increasingly employed in applications such as low-loss delivery of multi-kilowatt-level laser ...
Charu Goel +2 more
openaire +2 more sources
Numerical simulation to determine the fracture aperture in a typical basin of China
Fuel, 2021Jingshou Liu, Zikang Xiao
exaly
THE DETERMINATION OP THE NUMERICAL APERTURE OF A CONDENSER
Journal of the Royal Microscopical Society, 1951SYNOPSIS.The N.A. of a condenser can be conveniently determined by the use of an Abbe apertometer in an inverted position. This is suitable for all substage condensers, dry and immersion, bright and dark field.
openaire +1 more source
Imaging with a High Numerical-Aperture Objective
2000So far, all our studies have been based on the paraxial approximation described in Section 2.4. This approximation holds for an imaging lens (objective) whose numerical aperture is not large, in which case many effects such as apodization, depolarization and aberration can be ignored.
openaire +1 more source