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--- howto:align_beam_backreflection [2022/08/29 11:15] – peter
+++ howto:align_beam_backreflection [2022/08/29 11:17] (current) – peter
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 Adding a drop of water on top of the coverslip reduces the back-scattering intensity by an order of magnitude or so, but the basic shape remains the same. Even if one removes everything extra from the beam path, these fringes remain there, they are universal. Note that all those images above are slightly defocused.
-Such images are used for the daily and fundamental alignment of the MicroTime 200. The detailed procedure is described in the user manual of MicroTime 200. Although the MicroTime is extremely robust we suggest to spend 5-10 minutes every day for verifying the quality of the alignment by inspecting the back-reflection pattern. Have a look how this is used also by watching the tutorial [[howto:exchange_dichroic_mt200|How to exchange the main dichroic of the MicroTime 200.]]
+Such images are used for daily and fundamental alignment of the MicroTime 200. A detailed procedure is described in the user manual of MicroTime 200. Although MicroTime is extremely robust, we suggest to spend 5-10 minutes every day for verifying the quality of the alignment by inspecting the back-reflection pattern. Have a look how this is used also by watching the tutorial [[howto:exchange_dichroic_mt200|How to exchange the main dichroic of the MicroTime 200.]]
 The paper by [[ http://rspa.royalsocietypublishing.org/content/253/1274/358|B. Richards and E. Wolf: Electromagnetic diffraction in optical systems, II. Structure of the image field in an aplanatic system]] shows such 4 lobed patterns for polarized light.
 Similar figures can be found in this  [[https://books.google.cz/books?id=kURdAAAAQBAJ|classic textbook]].