<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Size15s:
[QBAnyway of modifying a laser pointer (removing the collimated lens thing)
and using a flashlight reflector to focus a larger beam?[/QB]<HR></BLOCKQUOTE>
To put it simply, nope.
If you removed the lens from a diode laser, you would have an elliptical beam of approximately 8° by 27°. Too narrow for any substantial amount of the beam to be captured & redirected by the flashlight reflector.
Visible red laser diode, no lens, about 2 feet from the target.
The only feasable way to get a larger diameter beam out of a laser is to use a collimator, which is essentially a telescope used backwards. The beam enters the small lens (analogous to the "eyepiece") and exits the other end.
At this point, the beam is a larger diameter and has a lower angular divergence, so it is capable of being projected farther before it starts to degrade. A mathematical formula is used to determine how much improvement has been made, but I do not have it handy at the moment.
For lack of a ready-made collimator, the same effect can be achieved by firing your laser through the *** end of a pair of binoculars. For a gas laser like a helium neon type that has a true Gaussian energy distribution curve, angular divergence should be approximately 7X less than it was before, assuming a typical good quality binocular was used.
Things start to get a bit tricky here, so here is where I'll leave it.
What about using some kinda small mirror to spread the beam out and reflect it back onto the Reflector (which would produce a beam with a hole) The mirror woud be round - the same size as the Laser beam and shaped like a cone pointing back to thge laser source.