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Optical question

  1. Jul 17, 2009 #1
    I am shining a HeNe beam into a 1:1 solution of 40% HF and 7% potassium permanganate. Potassium permenganate is very dark purple (cannot see visible light throught it). I am shining the HeNe through about 2 millimeters depth of this solution. I was wondering how much of the beam is actually getting through and hitting my sample at the bottom, or if the affects would just be neglegible. I am considering using sodium permanganate because I need a higher concentration, however, a solution of sodium permanganate will be dark red, though I don't know how dark yet because I have not ordered any. I can't dilute the potassium permanganate without lessening its effects. Even if I were to dilute it, the purple color would not decrease enough anyway. Please give me any tips you can. thank you.
  2. jcsd
  3. Jul 20, 2009 #2

    Andy Resnick

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    2016 Award

    It's not clear what you are doing- what is the laser illumination for?

    "Optical density" is what you are looking for: A quick search didn't turn anything up, but you can measure it reasonably easily.
  4. Jul 23, 2009 #3
    photoetching porous silicon
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