Laser beam split by a diffraction grating,Photo 1 of 3. Diffraction grating is an optical element whose properties are periodically modulated in one dimension. Light transmission through a diffraction grating occurs along discrete directions,called diffraction orders. In this series two gratings with different groove density (50 and 25 lines/mm) and two Helium-Neon lasers,red (632.8 nm) and green (543.4 nm),are used to observe the resulting diffraction patterns. Photo 1 and Photo 2 use different lasers but the same 50 lines/mm grating. Note that the spacing between diffraction orders is smaller for shorter (green) wavelength. Photo 3 uses the same red laser as Photo 1,but a different grating with 25 lines/mm groove density. The spacing between | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Giphotostock |
Taille de l’image : | 5097 px × 3226 px |
Model Release : | Non requis |
Restrictions : |
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