Abstract
Pulsed free electron lasers in which there is a dependence of the electron energy on the time of injection into the wiggler are expected to produce wide-bandwidth but coherent chirped optical pulses with unique characteristics. Such pulses could be converted in a dispersive medium into very short, high intensity pulses. The chirped pulses also have other potential applications. Chirping should produce enhanced efficiency in the high-power trapped-particle regime. Combining chirping with wiggler tapering may also lead to a new type of electron accelerator in which energy is transferred from slower electrons to faster electrons via the laser field.
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