Deformable Mirror

Plot the deformable mirror, adding documentation
Can you simplify this into constants and variables inside the loop. An example, `(w1/(2*pi*sig1**2)` will not change in the loop, so you don't need to recompute them all the time. But what I find even more important, right now this lines are quite hard to read. By creating some loop constants, which you can explain in comments and inside the documentation, your code is easier to read and understand.