A free electron laser allows higher frequencies.

Let's start with free electron lasers.

This sounds pretty easy but, in fact, the free electron laser has a number of gotchas.

Front cover:A free electron laser under development at Los Alamos in the US (see p 334).

Besides these accelerators there is also a free electron laser called XFEL under development.

This contrasts to the free electron laser (and xaser) that work on different principles and which electrons are highly relativistic.

For example, around 1980, he and coworkers produced a detailed analysis of the free electron laser, indicating how its spectral intensity can be optimized.

One possible solution to this dilemma lies in the free electron laser (FEL).

In the free electron laser the intensity increases exponentially with the number of electrons.

Electron beams pump free electron lasers and some excimer lasers.