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Diffractive beam splitter
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Diffractive beam splitter : ウィキペディア英語版
Diffractive beam splitter

The diffractive beam splitter
〔(Diffraction Gratings and Applications, Loewen, Erwin C. and Popov, Evgeny. Marcel Dekker, Inc. 1997. )〕
〔(Digital diffractive optics: an introduction to planar diffractive optics and related technology, Bernard C. Kress, Patrick Meyrueis , 2005. )〕
(also known as multispot beam generator or array beam generator) is a single optical element that divides an input beam into N output beams.〔(Diffractive Optics – Design, Fabrication and Test, O'Shea, Suleski, Kathman and Prather, 2004. p.83 )〕 Each output beam retains the same optical characteristics as the input beam, such as size, polarization and phase. A diffractive beam splitter can generate either a 1-dimensional beam array (1xN) or a 2-dimensional beam matrix (MxN), depending on the diffractive pattern on the element. The diffractive beam splitter is used with monochromatic light such as a laser beam, and is designed for a specific wavelength and angle of separation between output beams.
==Applications==

Normally, a diffractive beam splitter is used in tandem with a focusing lens so that the output beam array becomes an array of focused spots on a plane at a given distance from the lens, called the "working distance." The focal length of the lens, together with the separation angle between the beams, determines the separation distance between the focused spots. This simple optical set-up is used in a variety of high-power laser research and industrial applications that typically include:
:
* Laser scribing (solar cells)
:
* Glass dicing (LCD displays)
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* Perforation (cigarette filters)
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* Beam sampling 〔(Beam sampler )〕(Power monitoring & control)
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* 3-D motion sensing 〔(OPTICAL DESIGNS FOR ZERO ORDER REDUCTION(patent) )〕 (Example)
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* Medical/aesthetic applications (skin treatment) 〔(Fractional Laser Skin Treatment Using Diffractive Optics )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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