A common
material found on
starships in the
Star Trek Universe. Transparent aluminum is as strong as
aluminum, yet you can see right through it, unlike conventional aluminum. Thus, it makes a good material for starship
windows.
This is a material that humanity could really make good use of. Even the strongest polycarbonates are no match for one atmosphere of air pressure if the window is of any decent size. Making it very thick would work, but the optical properties will make looking through such a window an irritating experience. Something similar to transparent aluminum would also help out in deep sea diving, where portholes tend to be very small due to the massive pressure being exerted on them.