About observing the mewcury spectrum with a Fabry-Perot interferometer

  1. [SOLVED] About observing the mewcury spectrum with a Fabry-Perot interferometer

    Hello!

    I've been trying to observe the interference fringe pattern from a mercury discharge tube, but the pattern has not already shown up. I simply don't understand what I'm doing wrong.

    The first thing I did was to align both mirrors with a laser. With that source I saw the fringes, but after replacing the source the pattern gets lost. I've tried putting convergent lenses between the interferometer and the source but it doesn't help at all.
     
  2. jcsd
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