Re: Laser eavesdropping
The countermeasure to eavesdropping from vibrating windows is to pipe music through the window frames. This process defeats that countermeasure, if (and only if) you can observe the object normally (i.e. at *exactly* 90 degrees to the glass) through the glass, so that distortion caused by refraction isn't an issue.
My next suggestion would be to combine the musical window frames with double-glazing where the two panes are not quite parallel to one another, so it's literally impossible to see through from any angle without some refractive distortion.
Where do I collect my fee?
Biting the hand that feeds IT
