Národní úložiště šedé literatury Nalezeno 5 záznamů.  Hledání trvalo 0.00 vteřin. 
Diffraction efficiency of surface relief gratings
Hradil, Milan
Diffraction efficiency of surface-relief gratings with various profiles is discussed. The general relation for the diffraction efficiency is derived from the Frauenhoffer approximation. The general relation is applied for several profiles. It is pointed out that shallow profiles can provide high diffraction efficiencies.
Single-element holographic diffraction lenses used for collimation of near-infrared diode-laser beams
Pala, Jan ; Miler, Miroslav ; Aubrecht, Ivo
In the near infrared region optical beams emitted by diode lasers are strongly divergent and have a moderate astigmatism and ellipticity. For their collimation single holographic diffractive elements can be used. A series of that collimators have been recorded using Ar laser line 458 nm. The elements are inspected in a reverse arrangement in a collimated HeNe beam and a diffraction pattern of the second diffraction order beam is analyzed by Spiricon CCD camera. Spot diagrams were also computed.

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