N
Níkola Heímpel
- Jan 1, 1970
- 0
I have a Fabry-Perot interferometer and would like to lock the
interferometer cavity to one point of the transmission fringe. I
searched for basic informations on how to design the circuit for the
piezo voltage, but so far I haven't found something like "fringe locking
for dummies"...
I found a few descriptions (not very detailed though) of methods using
two photodiodes, one on a bright and one on a dark fringe, then
basically amplifying the difference and feeding it into the piezo
actuator. But is there also a way to do this with one diode? Or what
exactly would I have to look at if I wanted to design a circuit for two
diodes? I have read the basics about proportional, integral and
derivative control, guessing I would need at least p. and i, but no idea
how to put this in electronics.
If you would know a webpage/book/paper or something to read on this
topic, that would also help me a lot.
Thanks for your help,
Nikola
interferometer cavity to one point of the transmission fringe. I
searched for basic informations on how to design the circuit for the
piezo voltage, but so far I haven't found something like "fringe locking
for dummies"...
I found a few descriptions (not very detailed though) of methods using
two photodiodes, one on a bright and one on a dark fringe, then
basically amplifying the difference and feeding it into the piezo
actuator. But is there also a way to do this with one diode? Or what
exactly would I have to look at if I wanted to design a circuit for two
diodes? I have read the basics about proportional, integral and
derivative control, guessing I would need at least p. and i, but no idea
how to put this in electronics.
If you would know a webpage/book/paper or something to read on this
topic, that would also help me a lot.
Thanks for your help,
Nikola