There are several ways to directly convert acoustic/mechanic signals into optic signals (e.g. opening/closing a shutter, or the acousto-optic effect). Is there any way to do the reverse, without using photoelectric effects or other electric effects/electricity as intermediate?
I suppose one way would be to use the thermal heating from the light to deform e.g. a bimetal, but I doubt that will work with the light intensity of fiber-optic signals and it would probably be limited to low frequencies. Or am I wrong with that?
edit: background: This is purely theoretical. I'm exploring what the world would look like if we did not use electricity. While the acousto-optic effect can modulate sound onto a laser beam, I haven't found a way to do the reverse except by using electrical components.