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length vs intensity of Michelson interferometer

I did an Michelson interferometer experiment and this is the result. I think the reason why the intensity is getting smaller is because the translation motor was a bit off. But I don't understand why there is a small peak between the larger peak (which is the correct peak cause its max intensity is twice the intensity of the laser).

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  • $\begingroup$ What type of laser did you use as the light source? $\endgroup$ – S. McGrew Jul 22 '18 at 12:53
  • $\begingroup$ What is the setup of the experiment and how are the axis of the graph labeled? $\endgroup$ – Gimli Jul 22 '18 at 14:12
  • $\begingroup$ I used (OBIS) 405nm multi mode cw diode laser. The x-axis is movement of one of the mirror(mm) and the y-axis is the power where the two beams meet(mW). $\endgroup$ – 유승연 Jul 22 '18 at 14:36
  • $\begingroup$ I assume multimode means it has transverse multimodes (spatial profile of the beam is not single mode Gaussian). But have you also checked if the laser is operating longitudinally single mode (only single frequency peak)? $\endgroup$ – wcc Jul 22 '18 at 16:15
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    $\begingroup$ I think it would help if you could put a link to the spectrum of the laser you are using, if it is available. $\endgroup$ – wcc Jul 22 '18 at 16:28

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