Lasers smaller than a human hair emit doughnut-shaped light
Incredibly thin, hollow wires made from gallium and nitrogen can produce laser beams that are hollow with a ring-shaped cross-section, and that could be used to create optical fibres out of thin air
Incredibly thin, hollow wires made from gallium and nitrogen can produce laser beams that are hollow with a ring-shaped cross-section, and that could be used to create optical fibres out of thin air
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