Modulating a laser beam for communications is not new but this distance effort by amateurs doing a two-way voice transmission over 167km in New Zeland is pretty

Modulating a laser beam for communications is not new but this distance effort by amateurs doing a two-way voice transmission over 167km in New Zeland is pretty cool. This article also mentions a number of other laser communication long distance efforts. https://www.modulatedlight.org/Modulated_Light_DX/MODULATED_LIGHT_DX.html https://www.modulatedlight.org/Modulated_Light_DX/MODULATED_...