Safety Considerations
In order to produce laser beams visible in normal air, a relatively powerful laser is needed; at least about 20 mW of power, depending on the type of laser and the design of the instrument, is required in order to produce a visible array of beams. However, a considerably more powerful laser is needed to yield spectacular results, generally 500 mW or more. In any case, class IIIb or IV lasers will usually be necessary, introducing a significant risk of skin and eye damage unless precautions (gloves and protective glasses) are taken.
Read more about this topic: Laser Harp
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