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The development of femtosecond frequency combs and optical lattices has led to a new generation of atomic clocks. These clocks are based on atomic transitions that are resonant with visible light instead of microwave radiation. The major obstacle in operating an optical clock was the difficulty of directly measuring optical frequencies.
Joseph Carl Hafele (25 July 1933 – 15 November 2014) was an American physicist best known for the Hafele–Keating experiment, [1] a test of Einstein's theory of general relativity.
The development of atomic clocks has led to many scientific and technological advances such as precise global and regional navigation satellite systems, and applications in the Internet, which depend critically on frequency and time standards. Atomic clocks are installed at sites of time signal radio transmitters. [103]
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Sharps Bedrooms is a privately owned fitted bedroom and home office retailer and manufacturer. The company has 31 showrooms across the United Kingdom, with its factory and headquarters in Bilston, West Midlands. [1]
Both the Al-based quantum clock and the Hg-based optical atomic clock track time by the ion vibration at an optical frequency using a UV laser, that is 100,000 times higher than the microwave frequencies used in NIST-F1 and other similar time standards around the world. Quantum clocks like this are able to be far more precise than microwave ...
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