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wickedALEX said:Wow cool lences 20% and the other ones will bee even better ;D MOOR POWER
wickedALEX said:Wow cool lences 20% and the other ones will bee even better ;D MOOR POWER
IgorT said:Since some of you asked, i prepared a simple drawing to explain the focusing into a tiny spot for burning.
There is no universal position of the lens for the tiniest spot. Where the tiniest spot is, depends on the position of the lens. It's exactly there, where ALL the beams cross. If you put an object there, all of the beams will hit the same spot, and warm it up enough for it to burn. The energy density is the highest at this spot.
Look at the drawing:
- Normally, you want to have a beam focused to infinity (a parallel beam, that has the "same" diameter "all the way").
- If you then turn the focusing ring a little (in the direction, which would unscrew the lens - it moves the lens further away from the diode). Then, the beam will start wide, and gradually get narrower. At a certain point "all" the beams cross, and if you position the laser so that it is that "exact" distance from the object, it will burn the object. After the point where the beams cross, the beam starts diverging at the same rate as it converged, so the spot on a wal will be large.
- If you turn the lens a little more, the beam goes narrower faster, the beams cross closer to the laser, and you can burn from up close. Since it converges faster, it will also diverge faster, and the spot on the wall will be huge! Burning from up close is easier, than from a distance. But don't light matches from too close, as they explode into flames, and eject particulate matter, which could stick to the lens or damage it.
Besides, if you focus too close, the lens can be so far away from the diode, that it no longer collects all of the light.
Anyway, hope it helps....