The idea was to use that to focus the energy beam from a free-electron laser.

The electrons in a free-electron laser are not free, but are coupled to the magnetic field.

The undulator for the new free-electron laser at Orsay, France.

This led to further research and eventually surgeries on humans, the first ever using a free-electron laser.

More recently, he worked to develop free-electron lasers as power sources in high-frequency bands.

We have confirmed that the Soviets do have six free-electron lasers at this place.

Still a few free-electron lasers, like the one under construction at Vanderbilt University, may be used for specialized treatments on patients.

When finished, this free-electron laser is to be three to four miles long, its main apparatus buried in concrete tunnels beneath the desert.

But free-electron lasers barely existed when Mr. Reagan took office.

Lorentz contraction is also necessary to understand the function of free-electron lasers.