[Daniel, Alberto,Bram] 17 August 2012

We found a 221 kHz resonance in the laser PZT. We modified the PZT notch filter in the TTSFF, by changing C47 from 910 pf to a 1000 pf and a 68 pf parallel to each other. With the variable capacitor C46 we managed to set the notch frequency to 219 kHz. Although we should see a -23dB depth, we only measured -10dB. In the end this seemed to be ok.