Additional information:
The High voltage driver (first picture) is from Matsusada Precision (PZJ-0.15P-LVS2) and the datasheet can be found at the following link: https://www.matsusada.com/pdf/pzj.pdf
The piezo used for the SHG cavity (first measurement) is from Piezomechanik GmbH (HPCh 150/15-8/3) and has a capacity of 790nF.
The piezo used for the IR mode cleaner (second measurement) is from PI (P-025.20H PICA) and has a capacity of 430nF.