Methods, devices and systems for generating ultrashort optical linear
chirped pulses with very high power by amplifying the pulses so that
their temporal duration is longer than the storage time of the amplifying
medium. The additional gain factor is related to the ratio of the storage
time to the stretched pulse. A preferred embodiment connects a mode
locked laser source that generates optical pulses whose duration is
stretched with a chirped fiber Bragg grating. Embodiments include
methods, devices and systems causing an extreme chirped pulse amplifier
(XCPA) effect in an oscillator.