temama kirjoitti: ↑Marras 24, 2024 15 : 38
Jos ilmiö on aito ja toistettavissa, niin miksi noin kämänen esimerkkikuva??
Vois luulla, että epäsiistissä miesluolassa laservalo olisi raivannut tietä pölyssä ;D
En tiedä mistä tuo tekniikkatalous-lehden artikkelin kuva (minkä linkkasin mun kommenttiin) on saatu.
Kyllä artikkeli perustuu ihan vertaisarvioituun tutkimukseen.
Kanadalainen tutkimus kirjoitti:Shadow of a laser beam
Raphael A. Abrahao, Henri P. N. Morin, Jordan T. R. Pagé, Akbar Safari, Robert W. Boyd, and Jeff S. Lundeen
Abstract
Light, being massless, casts no shadow; under ordinary circumstances, photons pass right through each other unimpeded. Here, we demonstrate a laser beam acting like an object — the beam casts a shadow upon a surface when the beam is illuminated by another light source. We observe a regular shadow in the sense it can be seen by the naked eye, it follows the contours of the surface it falls on, and it follows the position and shape of the object (the laser beam). Specifically, we use a nonlinear optical process involving four atomic levels of ruby. We are able to control the intensity of a transmitted laser beam by applying another perpendicular laser beam. We experimentally measure the dependence of the contrast of the shadow on the power of the laser beam, finding a maximum of approximately 22%, similar to that of a shadow of a tree on a sunny day. We provide a theoretical model that predicts the contrast of the shadow. This work opens new possibilities for fabrication, imaging, and illumination.
Tutkimuspaperi:
https://opg.optica.org/optica/fulltext. ... &id=563468
Julkaistu ainakin tiedelehdessä EurekAlert!:
NEWS RELEASE 14-NOV-2024
https://www.eurekalert.org/news-releases/1064416
Scientists discover laser light can cast a shadow
Surprising finding could lead to new ways of controlling light
Peer-Reviewed Publication
OPTICA
