KRISS Remeasures Strontium 461 nm Transition Frequency with Photonic Grating Chip
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On October 20, 2026, Phys.org reported that the Korea Research Institute of Standards and Science (KRISS) used a photonic grating chip to remeasure the absolute frequency of the 461 nm optical transition in strontium atoms, reducing measurement uncertainty to about 5 MHz, more than a 50-fold improvement over the old value from 1938. The results were published in Metrologia.
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- Phys.org Optics & PhotonicsKRISS Remeasures Strontium 461 nm Transition Frequency with Photonic Grating Chip, Cutting Uncertainty More Than 50-Fold
The Korea Research Institute of Standards and Science (KRISS) has used a photonic grating chip to remeasure the absolute frequency of the 461 nm optical transition in strontium, reducing the measurement uncertainty to about 5 MHz. This improves on the old 1938 value by more than 50 times, and the results were published in Metrologia.
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