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Advances in Environmental Biology  A. Afroozeh,
Advances in Environmental Biology A. Afroozeh,

... A PCF is an optical fiber that achieves its waveguide properties not from a spatially variable glass structure but from planning of very small and closely spaced air holes which go through the whole length of fiber [1-3]. Photonic-crystal fiber (PCF) is a novel class of optical fiber based on the pr ...
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Pupil Mapping in 2-D for High-Contrast Imaging

Cost-effective optical coherence tomography spectrometer based on
Cost-effective optical coherence tomography spectrometer based on

... using only standard components. To reduce the depth dependent signal loss which is caused by the limited spectral resolution an increase of the numerical aperture is necessary. This is usually associated with enlarged optics. A growth of the device can be counteracted by a more efficient grating wit ...
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... is 100 km long. At this wavelength, the fiber has the following parameters for its silica cladding: n2 = 1.446, N2 = 1.466, and D2 = −0.0027. Its core has a radius of a = 4 μm and an index of n1 = 1.450. What are the propagation constant, the group velocity, and the group-velocity dispersion of the ...
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... achieved, some 10 times larger than in cona mode—within the hollow core while being ventional fibers (24 ). Unlike traditional “pounable to escape into the cladding. larization maintaining” fibers (bow-tie, ellipOptical and electron micrographs of a tical core, or Panda), which contain at least typi ...
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... phase. They posses a valuable combination of the favorable properties of both glasses and ceramics. Glass-ceramic is fabricated by the controlled crystallization of glass. The principal advantages of glass-ceramics over conventional ceramics are associated with the economy and precision of the formi ...
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... coherence length is slightly less than the mean or effective wavelength. That is why no fringes (modulation of intensity) of order |m| � 1 occur. So, in the case of unfiltered black-body radiation, interference patterns consist only of a central maximum (m = 0) flanked by two weak minima (m = ± 21 , s ...
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Retroreflector



A retroreflector (sometimes called a retroflector or cataphote) is a device or surface that reflects light back to its source with a minimum of scattering. In a retroreflector an electromagnetic wavefront is reflected back along a vector that is parallel to but opposite in direction from the wave's source. The angle of incidence at which the device or surface reflects light in this way is greater than zero, unlike a planar mirror, which does this only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence.
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