Light scattering at small angles by atmospheric irregular particles
... and size distributions of particulates in a continuous and realtime operating system (Rosen, 1964; Deshler et al., 2003; Donateo et al., 2006; Fischer and Koshland, 2006; McMurry, 2000; Renard et al., 2010, 2008). An example of an OPC is STAC (Stratospheric and Tropospheric Aerosols Counter). This d ...
... and size distributions of particulates in a continuous and realtime operating system (Rosen, 1964; Deshler et al., 2003; Donateo et al., 2006; Fischer and Koshland, 2006; McMurry, 2000; Renard et al., 2010, 2008). An example of an OPC is STAC (Stratospheric and Tropospheric Aerosols Counter). This d ...
Analysis And Design Of Wide-angle Foveated Optical
... The development of compact imaging systems capable of transmitting high-resolution images in real-time while covering a wide field-of-view (FOV) is critical in a variety of military and civilian applications: surveillance, threat detection, target acquisition, tracking, remote operation of unmanned ...
... The development of compact imaging systems capable of transmitting high-resolution images in real-time while covering a wide field-of-view (FOV) is critical in a variety of military and civilian applications: surveillance, threat detection, target acquisition, tracking, remote operation of unmanned ...
Understanding Laser Beam Parameters Leads to Better System
... a divergence half-angle, and further depends on the definition of the beam radius (or, diameter). Sometimes, full angles are used which results in twice as high angles. Therefore, some caution seems to be appropriate when it comes to a laser’s divergence specification. Beams with a very small diverg ...
... a divergence half-angle, and further depends on the definition of the beam radius (or, diameter). Sometimes, full angles are used which results in twice as high angles. Therefore, some caution seems to be appropriate when it comes to a laser’s divergence specification. Beams with a very small diverg ...
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... laser emission based on photonic defect modes (DMs) has been realized in a number of experiments [13]. In photonic lattices optically induced in a photorefractive crystal [7–9,14], the induced refractive index variation is typically orders of magnitude smaller than that in photonic crystals, while t ...
... laser emission based on photonic defect modes (DMs) has been realized in a number of experiments [13]. In photonic lattices optically induced in a photorefractive crystal [7–9,14], the induced refractive index variation is typically orders of magnitude smaller than that in photonic crystals, while t ...
super-resolved fluorescence microscopy
... mammalian cell, E. coli cell, mitochondrion, influenza virus, ribosome, GFP, thymine. In the case of light (optical) microscopy, which is, together with electron microscopy, the most important tool for the imaging of biological structures, this means that two objects within a ...
... mammalian cell, E. coli cell, mitochondrion, influenza virus, ribosome, GFP, thymine. In the case of light (optical) microscopy, which is, together with electron microscopy, the most important tool for the imaging of biological structures, this means that two objects within a ...
Variable xy-UV beam expander for high-power laser
... of elements used. In addition, we desire to use standard catalog elements to avoid fabricating custom cylinders, and they must be made of UV grade fused silica for high transmission at 355 nm. Fortunately, the CVI Melles Griot catalog offers a large selection of standard plano-convex and plano-conca ...
... of elements used. In addition, we desire to use standard catalog elements to avoid fabricating custom cylinders, and they must be made of UV grade fused silica for high transmission at 355 nm. Fortunately, the CVI Melles Griot catalog offers a large selection of standard plano-convex and plano-conca ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.