منابع مشابه
Bright Lenses and Optical Depth
In gravitational lensing, the concept of optical depth assumes the lens is dark. Several microlensing detections have now been made where the lens may be bright. Relations are developed between apparent and absolute optical depth in the regime of the apparent and absolute brightness of the lens. An apparent optical depth through bright lenses is always less than the true, absolute optical depth...
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Abstract Superpositions of paraxial laser beam modes to generate atom-optical lenses based on the optical dipole force are investigated theoretically. Thin, wide, parabolic, cylindrical and circular atom lenses with numerical apertures much greater than those reported in the literature to date can be synthesized. This superposition approach promises to make high quality atom beam imaging and na...
متن کاملOptical Design using Fresnel Lenses
The Fresnel lens can be used in a wide variety of applications. The basic principles of the Fresnel lens are review ed and some practical examples are des cribed. There are definite advantages and tradeoffs that should be considered when deciding if a Fresnel lens is the appropri ate component to use in a design. Some basic optimization rules are presented which may facilitate a first order ...
متن کاملOptical measurement techniques with telecentric lenses
This course on optical 2d-measurement technique has been created during the development of the telecentric lenses from Schneider-Kreuznach. First of all we had the idea to explain to the "non optics expert" the differencies between normal lenses and telecentric optical systems by introducing the laws of perspective (Chapter 2). But in the course of writing it became very soon evident that we ha...
متن کاملOptical Quality of Three Multifocal Lenses.
We enjoyed reading the article by Esteve-Taboada et al.,1 but were disappointed by their interpretation of their data. Their optical model has important limitations that make it inappropriate to make broad clinical generalizations from their findings. First, the “aberration-free” eye model is highly artificial. In particular, the absence of any spherical aberration is relevant to only a small p...
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ژورنال
عنوان ژورنال: T'oung Pao
سال: 1915
ISSN: 0082-5433,1568-5322
DOI: 10.1163/156853215x00077