"Sam Goldwasser" bravely wrote to "All" (16 Feb 05 19:11:03)
--- on the heady topic of " Laser Pointers on the Skin"

SG From: Sam Goldwasser
SG Xref: aeinews sci.electronics.repair:10721

SG "NSM" writes:

wrote in message
...
This is not about repair, but I thought someone on here might know.
...
So I took the thing away from them. As a test, I pointed the thing at
a spot on my hand, and they are correct, it does make the spot warm. ...

So does a 60 W light bulb.

SG As long as they keep it away from anyone's eyes, it is safe.
SG It's less tha 1/200th of a W.


One thing I've discovered about laser pointers is that the chip area
is purposely constructed so that it is impossible to collimate the
beam to make it into a dangerous device. What I think happens is that
there are multiple lasing areas which are slightly out of phase with
each other. When one tries to concentrate the beams onto a very tiny
spot they tend to subtract from each other and cancel out.

A*s*i*m*o*v

.... I worked hard to attach the electrodes to it.