Bath interferometer

Laser interferometer. Do you see anything wrong? Hint: it has to do with the beam splitter.


  • 2″ laser collimator sitting in a Newport V-block.
  • A beam splitter from Surplus Shed.
  • Some optical posts from Thorlab.
  • An optical quality mirror and its support, also from Thorlab.
  • An L shaped aluminum extrusion fitted with a lens
  • An aluminum plate with some grooves to position the stands.
  • An X, Y, Z, R linear block
  • DFTFringe for processing.