25 Apr '17, 5am

500mWだとギリギリClass 3bで、所有にN2、使用にN3ライセンスが必要みたい。 / “Lasers and Laser Pointers” https://t.co/GKHxsdfD6i

Laser pointers are hand-held, pen-like and battery-powered devices that can project a laser beam for the purpose of highlighting key locations at a distance or areas of interest on the screens during presentations. Commonly available laser pointers emit red coloured light although more expensive pointers which emit green or blue light exist too. Red light laser pointers usually come under the laser classes of 1, 2 or 3A, with beam power up to 5 milliwatts (mW). These classes give users an indication of the degree of laser hazard. The higher the class, the more powerful the laser and the greater will be its potential to pose serious danger if used improperly. More powerful classes of laser pointers exist – these are the Class 3b and Class 4 laser pointers (see FAQ below for further information). The laser beams from these pointers may reach a few hundred milliwatts (mW), an...

Full article: http://www.nea.gov.sg/anti-pollution-radiation-protection...

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