World's sharpest laser can travel undisturbed for 33 lakh km
A US-German research collaboration has created the world's sharpest laser which can travel about 33 lakh kilometres (nearly ten times Earth-Moon distance) before going out of sync. The laser is termed sharpest as it has a record minimum 10 mHz linewidth, which determines how much the wave would disperse. Such precision is useful for applications including atomic clocks and spectroscopy.