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to measure the Finesse, instead of having 2x EOM for the PDH and for the modulation sweep, I simply used 2x generators coupled with DC-blocks to a T connector (SMA) screwed directly on the EOM input.
as the transmission signal is fluctuating, it is not easy to have a good fit of the Airy peak.
if I measure the width at half of the maximum of the peak, I found roughly 10kHz instead of the awaited 2kHz... :-(
one needs a better evaluation with a more stable transmission signal and also to be sure that the L-shape metal piece (used to remove high order modes) does not introduce some losses and then reduce the Finesse...
| Manar Amer wrote: |
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This morning, me and Ronic managed to obtain the FSR and image of the finesse which is to be analyzed.
Adding:
- Beam Image at P4 propagation, no lens is added.
- Image of the Finesse on Oscilloscope
more information to be included later
Will continue in the afternoon .
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