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Free-electron laser
A
free-electron laser
(FEL), is a type of
laser
whose
lasing medium
consists of very-high-speed electrons moving freely through a magnetic structure, hence the term
free electron
. The free-electron laser is
tunable
and has the widest
frequency
range of any laser type, currently ranging in
wavelength
from
microwaves
, through
terahertz radiation
and
infrared
, to the
visible spectrum
,
ultraviolet
, and
X-ray
.
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