Author Topic: Polarisation  (Read 112 times)

April 27, 2018, 10:28:09 AM

Matt Wilkinson

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Polarisation
« on: April 27, 2018, 10:28:09 AM »
We need to talk about polarisation!

At Herstmonceux, we are still emitting linear polarised laser light after an attempt to make it circular with a 1/4 wave plate failed. The circular polarisation was lost through the coudé mirrors before the beam left the emitter.

Would everyone please describe here the polarisation characteristics of their SLR systems.
  • What is polarisation state of the laser light emitted by your SLR system?
  • How are you achieving this?
  • Have you tested this and know that you are sending what you think you are at all telescope azimuths and elevations?
  • Can you control the emitted polarisation?
  • What are the polarising properties of your receive path [At Hx, we found our receive path to be highly selective to polarisation and we had to replace our dichroic mirror]
In the future, we plan to look further at circular polarisation and would be grateful for any advice from those that are able to send circular polarised light.  We also hope to return to looking at controlling the emitted linear polarisation orientation using a 1/2 wave plate.

Thanks
Matt