- We changed the mirrors position back to the original reference (0, 0, 0, 0) for all mirrors, but the alignment could not be found.
- The course of action will be :
- abandon the alignment done previously with Helium Neon Laser
- Set and distance between the spherical M3-M4 to a value that stabilizes the cavity, and keep the distance between the planar at zero reference.
- Align the cavity from the start with the koheras
- after finishing the alignment, change the distance between the planar mirrors M1-M2 mirrors to match the rep. frequency 876.3636 MHz
While maintaining the alignment.
| Ronic Chiche wrote: |
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today with Manar, we brought the Koheras to the Minicav optical room and aligned it with the Iris used for the cavity.
but if I properly understood what Manar said to me, the cavity mirrors have been moved by roughly 1cm after Daniele and Manar finished the alignment.
with what we saw today, it seems the cavity is not aligned anymore.... we will check that tomorrow with Daniele.
we have a beam at the output window but I'm quite sure it only goes through M1 and not M2 anymore... and then directly to the output window in between M2 and M4.
the other important point for us is the room temperature.
it seems to be set at 25.5°C or something like that.
it's much too high.
Aurélien, who is the person to contact to change this temperature?
a setting around 21°C would be much more convenient...
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