Hi. We are trying to lock the frequency of two laser by a phase locking loop. The error signal is from the homodyne detection of two laser's light, which is a sine-like electrical signal with a random frequency from 0 to 50MHz due to the laser frequency drift. We need to input this error signal to our PID controller. The PID will generate a control signal to one laser to compensate the frequency drift. But the bandwidth of our PID is 10MHz. So we may need a frequency divider before PID to divide the frequency of error signal to 1/4 or 1/8. But we find it is difficult to choose which kind of the frequency divider in the website of Analog Device.
We can also make the frequency of error signal start from a non-zero frequency, like 100MHz. And then substract this frequency by a frequency mixer and filter.
Could you give us some suggestions on which kind of frequency divider of Analog Device is suitable for our experiment?
Thank you very much for your kindly help.
