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Optical molasses schematic. Optical molasses is a laser cooling technique that can cool neutral atoms to as low as a few microkelvins, depending on the atomic species. An optical molasses consists of 3 pairs of counter-propagating orthogonally polarized laser beams intersecting in the region where the atoms are present.
Like an optical beam, the atomic beam may exhibit diffraction and interference, and can be focused with a Fresnel zone plate [2] or a concave atomic mirror. [3] For comprehensive overviews of atom optics, see the 1994 review by Adams, Sigel, and Mlynek [1] or the 2009 review by Cronin, Jörg, and Pritchard. [4]
The beam of a single transverse mode (gaussian beam) laser eventually diverges at an angle that varies inversely with the beam diameter, as required by diffraction theory. Thus, the "pencil beam" directly generated by a common helium–neon laser would spread out to a size of perhaps 500 kilometers when shone on the Moon (from the distance of ...
Atomic beam is special case of particle beam; it is the collimated flux (beam) of neutral atoms. The imaging systems using the slow atomic beams can use the Fresnel zone plate (Fresnel diffraction lens) of a Fresnel diffraction mirror as focusing element. The imaging system with atomic beam could provide the sub-micrometre resolution.
A photograph showing two Fulton MX-991/U Flashlights, next to an unofficial reproduction and a standard angle-head flashlight. The MX-991/U Flashlight (aka GI Flashlight, Army flashlight, or Moonbeam [1]) from the TL-122 military flashlight series of 1937-1944 and is a development of the MX-99/U flashlight issued in 1963 [clarification needed].
AceBeam was founded in 2014 in Shenzhen by Michael Song, a graduate of Beihang University. [4]Over the years, AceBeam has introduced long-distance tactical flashlights, [5] headlamps, [6] [7] everyday carry lights, [8] white laser lights, searchlights, [9] [10] [11] emergency battery-charging flashlights, [12] [13] [14] high-lumen flashlights, [15] and camping lights.
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