Fluorescence_in_calcite.jpg
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This image was selected as
picture of the day
on Wikimedia Commons for
16 January 2018
. It was captioned as follows:
Other languages:
Italiano
:
Fluorescenza
e
birifrangenza
prodotta da un fascio
laser
blu da 445 nm in un cristallo di
calcite
.
Polski
:
Zjawisko
fluorescencji
oraz
dwójłomności
w krysztale
kalcytu
oświetlonym
niebieskim laserem
o
długości fali
445 nm.
Русский
:
Флуоресценция
и
двойное лучепреломление
синего лазера с длиной волны 445
нанометров
в кристале
кальцита
.
Українська
:
Флюоресценція
та
подвійне променезаломлення
синього лазеру з довжиною хвилі 445
нанометрів
в кристалі
кальциту
.
|
Summary
Description Fluorescence in calcite.jpg |
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.
Français :
Fluorescence et birefringence dans un bloc de calcite par un laser de 445nm.
Polski:
Zjawisko
fluorescencji
oraz
dwójłomności
w krysztale
kalcytu
oświetlonym
niebieskim laserem
o
długości fali
445 nm.
Русский:
Флюоресценция и двойное лучепреломление лазерного луча с длиной волны 445 нм в кристалле кальцита
Українська:
Флюоресценція
та
подвійне променезаломлення
синього лазеру з довжиною хвилі 445
нанометрів
в кристалі
кальциту
.
Italiano:
Fluorescenza
e
birifrangenza
prodotta da un fascio
laser
blu da 445 nm in un cristallo di
calcite
.
فارسی:
نگارهای از ضریب شکست مضاعف پرتوهای لیزر در حالی که از طریق یک کانی کلسیت عبور میکند ، برخی از اثرات فلورسنس نیز وجود دارد.
|
Date | |
Source | Own work |
Author | Jan Pavelka |
This image was uploaded as part of European Science Photo Competition 2015 . |
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