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Optics and photonics

Optics and photonics

Microwave timing signals get hundredfold boost in stability

02 Jun 2020
Optical detector
Optical detector The black rectangle at the centre of this image is a high-speed semiconductor photodiode that converts laser pulses to super-stable microwave frequencies. The diode is surrounded by a gold-coated border in which electrical leads are embedded. Wires connect the leads to the copper electrical circuit (top) used to extract microwave signals. The entire setup rests on a brass plate for mechanical stability. (Courtesy: F Quinlan/NIST)
The best-ever conversion of an optical clock’s time signal to a microwave signal has been demonstr

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Sam Jarman is a science writer based in the UK
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