Focusing in on the world’s sharpest laser

Lasers are synonymous with precision, but generally speaking there’s room for improvement. The "perfect" laser would emit light at one specific wavelength, but current technology can’t achieve that yet, shining across the spectrum in a measure that scientists call "linewidth." Narrowing that linewidth down as far as possible is one of the aims of laser research, and now an international team has developed the world’s sharpest laser, with a linewidth of just 10 mHz (0.01 Hz).

Michael Irving

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