This file was a finalist in Picture of the Year 2016. This file was the picture of the day on January 16, 2018. This is a featured picture on Wikimedia Commons (Fotografi të Shkëlqyeshme) and is considered one of the finest images. See its nomination here. This is a featured picture on the English language Wikipedia (Featured pictures) and is considered one of the finest images. See its nomination here. This is a featured picture on the Persian language Wikipedia (نگارههای برگزیده) and is considered one of the finest images. See its nomination here.
English: Fluorescence and birefringence of 445 nm laser in calcite crystal.
The blue laser beam is only visible when the blue light is scattered, for example, by dust particles. Due to the 1.3s exposure time, no individual dust particles can be seen. Dust particles are present in the air, but not in the crystal. In the crystal, some part of the blue light is absorbed and re-emitted as orange light, which is called fluorescence. Most of the blue light just continues to the other end of the crystal.
On the lower left you can see the laser beam going in. Part of the light is reflected on the front surface of the crystal; this is the beam you see on the upper left. In the crystal, the two polarisations are refracted by different angles, forming two beams in the crystal. At the end surface, the two beams (both of which are polarised along the axes of the crystal) are refracted back to their original direction, forming the two parallel beams on the right. Inside the crystal, the two beams cause fluorescence and non-polarised orange light is emitted from each point along both beams in every direction. As this light leaves the crystal, it's separated into two orthogonal polarisations, which are refracted by different angles, so that the observer sees four orange beams. The additional spots and beams you can see result from internal reflections.
ta shpërndani – ta kopjoni, rishpërndani dhe përcillni punën
t’i bëni “remix” – të përshtatni punën
Sipas kushteve të mëposhtme:
atribuim – Duhet t’i jepni meritat e duhura, të siguroni një lidhje për tek licenca dhe të tregoni nëse janë bërë ndryshime. Këtë mund ta bëni në ndonjë mënyrë të arsyeshme, por jo në ndonjë mënyrë që sugjeron se licencuesi ju del zot juve apo përdorimit tuaj.
share alike – Nëse bëni një “remix”, e shndërroni, ose ndërtoni duke u bazuar te materiali, duhet t’i shpërndani kontributet tuaja sipas të njëjtës licencë ose një të tille të përputhshme me origjinalen.
Canon EOS 350D<\/a>\u00a0anglisht<\/sup>"}},"text\/plain":{"sq":{"P4082":"Canon EOS 350D"}}}}" class="wbmi-entityview-statementsGroup wbmi-entityview-statementsGroup-P4082 oo-ui-layout oo-ui-panelLayout oo-ui-panelLayout-framed">