[Aritomi, Yuhang, Matteo, Eleonora]
We measured RF peaks in QPD2 input1. This is the same measurement as elog2111, but this time the green is reflected from FC and galvo is engaged and there is no 32dB amplification. Setting of spectrum analyzer is the same as elog2111. Green power at QPD2 was 2.3 mW.
Measured RF peak values are as follows. Note that 62.8 MHz and 93.2 MHz peaks are beatnotes of 15.2MHz and 78MHz.
| Frequency (MHz) |
FC locked+galvo locked (dBm) |
FC unlocked+galvo locked (dBm) | FC unlocked+galvo unlocked (dBm) |
| 15.2 | -47 | -42 | -35 |
| 30.4 | -58 | -58 | -58 |
| 62.8 | -61 | -61 | -61 |
| 78 | -58 | -49 | -49 |
| 93.2 | -67 | -67 | -67 |