NIST researchers have established a new measurement standard using an optical frequency comb, a device that functions like a precise “ruler for light” to measure frequencies across the spectrum. This technology, which earned a Nobel Prize after decades of development, successfully bridges the gap between radio waves and optical light to redefine the second and the meter. The standard is now implemented in atomic clocks that are 100 times more accurate than current civilian timekeeping systems, moving from theoretical proposals to practical reality.
The adoption of this standard significantly enhances technologies that rely on precise timing, such as GPS navigation, while also enabling advanced research into quantum phenomena and dark matter. The device works by generating a billion light pulses per second to create frequency markers, allowing scientists to translate optical signals into microwaves with extreme accuracy. Beyond timekeeping, the comb allows for highly sensitive detection of environmental changes, structural failures, and even disease markers in human breath, driving innovation in quantum sensing over the coming years.
Source: https://www.nist.gov/blogs/taking-measure/making-measurements-fine-toothed-comb-0
Keywords: optical frequency combs, atomic clocks, electromagnetic spectrum
