L@ser attacks on Aircraft

[911slf]

Optical Density at different wavelengths

Optical Density 5 would reduce light by factor of 100,000 at the wavelengths for which it operated. For example if it applied at all visible/IR/UV wavelengths you could stare at the sun through a telescope with no danger assuming the filter was perfect, fitted to the objective not the eyepiece, you do not align the telescope by looking along the barrel etc. I am NOT recommending you should do this - a projection system is still better if you really wanted to look at the sun.

So the Optical Density needs to be high at only the wavelength you need to block and no other - and this assumes all the problem lasers have the same wavelength (don't know if they do or not, it seems quite likely). Optical Density needs to be near zero at all other wavelengths if it is not to adversely affect your colour vision. And the lens needs to be a good optical flat or ground to same prescription as your spectacles.

I am not a pilot but I do know a bit about optics. I suggest it would be good to consult with aviation medicine specialists (your employers'?) before wearing laser filters.

And of course I agree with the sentiments expressed to the effect that offenders should be treated severely and ownership of high power lasers (above 1mw?) restricted by licence.