Maxbert,
1. Cockpit design is arranged to give pilots forward and lateral views of the ground, especially when the aircraft is on approach. How else do you think they land them?
2. You ask how these lasers can be accurately aimed at aircraft? Ask the Chavs that do it!
3. The aircraft windscreen is most definitely NOT tinted and great trouble is taken in design to ensure they are as optically perfect as possible. What you are observing is a little refraction/reflection from the window heating film embedded in the multiple layers making up the cockpit windows.
Make the bloody things illegal, "using them for backyard astronomy?" my @rse!.