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When a Gaussian laser beam is focused, the focused spot diameter is defined by d 00 = 4 λ f π D 00 {\displaystyle d_{00}={4\lambda f \over \pi D_{00}}} , (3) where d 00 is the ideal focused spot diameter, f is the focal length of the focusing lens, and D 00 is the input beam waist and is placed one focal length from the lens as shown in the ...
M 2 is useful because it reflects how well a collimated laser beam can be focused to a small spot, or how well a divergent laser source can be collimated. It is a better guide to beam quality than Gaussian appearance because there are many cases in which a beam can look Gaussian, yet have an M 2 value far from unity. [1]
Laser scanning is the controlled deflection of laser beams, visible or invisible. [1] Scanned laser beams are used in some 3-D printers, in rapid prototyping, in machines for material processing, in laser engraving machines, in ophthalmological laser systems for the treatment of presbyopia, in confocal microscopy, in laser printers, in laser shows, in Laser TV, and in barcode scanners.
Spectral line shape or spectral line profile describes the form of an electromagnetic spectrum in the vicinity of a spectral line – a region of stronger or weaker intensity in the spectrum. Ideal line shapes include Lorentzian , Gaussian and Voigt functions, whose parameters are the line position, maximum height and half-width. [ 1 ]
A laser fence mechanism detects objects passing the line of sight between a laser source and detector. [1] Stronger lasers can be used to injure entities passing the laser beam, as in a mosquito laser. [3] Fictional uses of laser fences often extend the concept so that fences may have the ability to prevent intruders by blocking or injuring them.
Schooling in Ferndown, as in much of Dorset, is based on a three-tier system of first, middle and upper schools. Ferndown Upper School is a co-educational comprehensive school for students aged between 13 and 19, with up to 320 pupils admitted each year from its feeder middle schools in Ferndown, West Moors and Verwood.
Pennsylvania (/ ˌ p ɛ n s ɪ l ˈ v eɪ n i ə / ⓘ PEN-sil-VAY-nee-ə, lit. ' Penn's forest country '), officially the Commonwealth of Pennsylvania [b] (Pennsylvania Dutch: Pennsilfaani), [7] is a U.S. state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.
Operation Sea Orbit, the first round-the-world voyage by nuclear-powered ships, came to an end as the aircraft carrier USS Enterprise and the missile cruiser USS Long Beach arrived in Norfolk, Virginia after a 64-day, 32,600-mile (52,500 km) trip made without refueling; the cruise marked "the first around-the-world showing of the American flag" since the voyage of the Great White Fleet between ...