SHG Cavity: Difference between revisions

Revision as of 20:40, 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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-The first thing to do is to measure the beam profile and figure out what sort of lenses need to be used to mode match the beam.
+The first thing to do is to measure the beam profile and figure out what sort of lenses need to be used to mode match the beam.  From what I've experienced, it's easiest to mode match the cavity with two lenses.  Both lenses together determine the waist size and position and both need to be adjusted to best mode match the cavity.  However, it seems like lens 1 moves the position of the waist more than the size of the waist and lens 2 changes the waist size more than the position.  I find it easiest to have both lenses on translation stages.
+Once the position and focal lengths of the mode matching lenses are determined, the next thing to do is to place the crystal in the beam path where it will be in the cavity.
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 * Picture of cavity design