1° Forum di Astronomia Amatoriale Italiano

ciao cri,
la sezione piu' corretta è astrofili.
tuttavia ti segnalo che non è legale, in italia, l'uso (e la vendita) di laser di potenza superiore ai 5mW.

Ma perché esagerare?

http://en.wikipedia.org/wiki/Laser_safety

La Classe IIIa (quella con potenza inferiore a 5mW) è quella che, se il laser capita accidentalmente nell'occhio per un brevissimo istante, potrebbe non causare danni alla vista.

Beh ma addirittura inferiore poi come lo vedo il fascio?
Già il mio defunto era un classe 3B...

E ci hai creduto!!

Class 3B

A Class 3B laser is hazardous if the eye is exposed directly, but diffuse reflections such as from paper or other matte surfaces are not harmful. Continuous lasers in the wavelength range from 315 nm to far infrared are limited to 0.5 W. For pulsed lasers between 400 and 700 nm, the limit is 30 mJ. Other limits apply to other wavelengths and to ultrashort pulsed lasers. Protective eyewear is typically required where direct viewing of a class 3B laser beam may occur. Class-3B lasers must be equipped with a key switch and a safety interlock.

Class IIIb

Lasers in this class may cause damage if the beam enters the eye directly. This generally applies to lasers powered from 5–500 mW. Lasers in this category can cause permanent eye damage with exposures of 1/100th of a second or less depending on the strength of the laser. A diffuse reflection is generally not hazardous but specular reflections can be just as dangerous as direct exposures. Protective eyewear is recommended when direct beam viewing of Class IIIb lasers may occur. Lasers at the high power end of this class may also present a fire hazard and can lightly burn skin.

3B? Sicuro?