Autofocus problem

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Hi!
I'm working on optical systems and I'm searching for algorithms and methods to solve the problem of autofocus.
I've already tried a bisection method and some optimization methods, but now I'd like to find a way to use neural networks in order to have a very fast and very precise way to move the lenses of my system to the right focus position.
Do you have any idea of the network I can use and how can I properly use it?
For the tests I'm using a setup made by an optical target, an objective and a sensor fixed on a linear positioner which is controlled by two functions I wrote in Matlab to move it back and forward.
Thank you!