Free-electron lasers are the must-have gadgets for all self-respecting modern laboratories. They work by sending a beam of electrons into an undulating magnetic field, called a wiggler. This changes the trajectory of the electrons, forcing them to emit coherent photons. That's cool, but their real flexibility comes from their tunability. Change the energy of the incident electrons or fiddle with the wiggler, and you can change the wavelength of the laser light they produce.
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