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Combining multiple pen lasers 4mW to burn paper is this possible

Discussion in 'Electronic Basics' started by Guest, Apr 11, 2005.

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  1. Guest

    Guest Guest

    Greetings, All

    Is it possible to combine multiple pen lasers angled down at one point (around 4mw) to burn paper?

    What wattage is needed for a laser to burn paper?

  2. tlbs

    tlbs Guest

    Red LASER pens produce photons at one narrow frequency (~620 nm red
    light). That particular frequency is well reflected and not well
    absorbed by plain paper, so you would need alot of them to burn paper.
    If the paper has a reflectance to visible light of 95%, only 5% of the
    photons are absorbed. I would estimate you could probably do it with a
    few hundred of them.

    On the other hand, if you had say, a 4 mW, 1 micron LASER pen
    (infared), you would only need about 5 to 10 of those (and it's cool to
    watch paper fry, paint peel and char on the wall, etc, etc.).
  3. Perhaps he could just get black paper, or draw a dot on it with a
    marking pen.

    It sounds like this is a one-off project for fun, so solutions like that
    may be perfectly acceptable.
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