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260 months ago

Isabelle (a guest user) asked this question:

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260 months ago

   wrote:

faisceau focalisé

My comment:

spot: on a very precise point
http://www2.int-evry.fr/~lidzbors/tipe/
les moments magnétiques sont alignés dans la position 0 sur le disque. Pour enregistrer et effacer un disque magnéto-optique, deux éléments sont nécessaires : un faisceau laser focalisé et un électroaimant..
www.irepa-laser.com/telechar/lettre16.php

The asker rated this answer best

260 months ago

   wrote:

..."une concentration du faisceau" ou "une concentration du rayon " (lumineux?")...

My comment:

un peu plus de contexte aurait été mieux mais Sony étant un des mots clés, il pourrrait s'agir de faisceau lumineux. Bon courage, Véronique

Comments by other colleagues on this answer:

260 months ago

   wrote:

Blue laser and 0.85 NA lens enable high-density recording By reducing the wavelength of laser light, from red to violet, it is possible to make a narrower “beam spot”, thus enabling higher recording densities. Professional Disc for DATA employs a blue laser with a wavelength of just 405 nm, enabling a data density some 2.6 times that of the red laser technology used for conventional optical media. Moreover, the powerful objective lens (used for focusing the laser beam) has a numerical aperture of 0.85 – greater than that used for DVDs (NA: 0.6) and MO discs (NA: 0.575). The resulting narrow beam further doubles recording density. As a result, track pitch is just 0.32µm, making it possible to record as much as 23GB on one side of a disc.