Could this be the tech leap that makes your next smartphone faster – and cheaper?

https://www.scmp.com/news/china/science/article/3198490/could-be-tech-leap-makes-your-next-smartphone-faster-and-cheaper

"free-electron laser... extremely fine wire about 8cm (3.1 inches) in length, the new device can emit laser-like light in a broad range of wavelengths for a wide array of applications... extra energy excites electrons to move to higher-energy orbit... When return to normal orbit emit photons... light waves in a laser beam are “coherent”, meaning the beam of photons is moving in the same direction at the same wavelength... sync electrons like a team of honour guards generate greater power"

Related: Milestone reached for superconducting undulator for European XFEL

https://phys.org/news/2024-02-milestone-superconducting-undulator-european-xfel.html