Optical Question: HeNe Beam Through Potassium Permanganate

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SUMMARY

The discussion focuses on the transmission of a Helium-Neon (HeNe) laser beam through a 1:1 solution of 40% hydrofluoric acid (HF) and 7% potassium permanganate. The user is concerned about the optical density of the solution, which is significantly dark purple, potentially obstructing the laser beam. They are considering switching to sodium permanganate for a higher concentration, despite its dark red color. The key takeaway is the importance of measuring optical density to determine how much of the laser beam penetrates the solution.

PREREQUISITES
  • Understanding of optical density and its measurement techniques
  • Familiarity with laser properties, specifically Helium-Neon (HeNe) lasers
  • Knowledge of chemical solutions, particularly potassium and sodium permanganate
  • Basic principles of light absorption in colored solutions
NEXT STEPS
  • Research methods to measure optical density in solutions
  • Explore the properties and applications of sodium permanganate
  • Investigate the effects of hydrofluoric acid on optical measurements
  • Learn about photoetching techniques in porous silicon
USEFUL FOR

This discussion is beneficial for chemists, optical engineers, and researchers working with laser applications in colored solutions, particularly those interested in optical density measurements and their implications in experimental setups.

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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 through 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.
 
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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.
 
photoetching porous silicon
 

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