an idea for search lights, have been used?

[raaaid]

light is known to open to the distance squared

but searchlights from clod are laser like

i wonder couldnt you make light perfectly paralalell being able to reach infinity by reflecting it in the right concave mirror?

so did they use concave mirrors to make light go parallel in searlights of wwii or the clod searclights are wrong?

edit:

i mean with this mirrors you could make with light the same things than lasers could it be supressed tech?