frequency

Integrated optical frequency division for microwave and mmWave generation

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Microwave and mmWave with high spectral purity are critical for a wide range of applications1,2,3, including metrology, navigation and spectroscopy. Owing to the superior fractional frequency stability of reference-cavity stabilized lasers when compared to electrical oscillators14, the most stable microwave sources are now achieved in optical systems by using optical frequency division4,5,6,7 (OFD). Essential to … Read more

Pushing the boundary on ultralow frequency gravitational waves

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A team of physicists has developed a method to detect gravity waves with such low frequencies that they could unlock the secrets behind the early phases of mergers between supermassive black holes, the heaviest objects in the universe. The method can detect gravitational waves that oscillate just once every thousand years, 100 times slower than … Read more