Femtosecond Phase Stabilization - Electronic Part
For setups where the interferometer for the offset beat geneation has already been realized, or for oscillators with an octave spanning or near octave spanning output, our locking electronics unit can be the ideal add-on.
The offset frequency is phase locked to ¼ of the repetition frequency. For this task the repetition frequency is divided by 4 and sent to Port 1 of our digital phase detector. Port 2 of the phase detector gets as input the amplified and filtered offset frequency signal. A PI-circuit that drives an acousto optical modulator or a piezo actuator closes the control loop.