SHG Cavity: Difference between revisions

Revision as of 22:10, 21 May 2014

We can write our observations and procedures for the SHG cavity here. Also, it might be useful to have a list of any spec sheets.

5/21/14

After detuning the temperature and aligning the vertically polarized light to the cavity we saw 5.5 mW of green light. The input power was 45 mW.

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 Next place M4 and M1 in the beam path.  Again, make sure the beam is as centered as possible on the curved mirror.  Use these mirrors to shine the beam through the crystal again.  If you were careful enough while placing the mirrors in the cavity you should be able to see at least one other dot (probably several dots) by the reflected beam.  While looking at those dots, walk M4 and M1 to try to overlap the dots with the reflected beam.  As you get more aligned you should see more dots begin to collapse in on the central spot.
+Pro Tip: If the reflected beam is too bright so it is tough to see the multiple passes, put a microscope slide in the long leg of the cavity and use the reflection off of that to see the multiple passes.  After you align the cavity this way and remove the slide, you will need to tweak the alignment a little, but not an obnoxious amount.
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 * Picture of cavity design