Abstract
A scheme for an XUV-wavelength free electron laser based on trapping electrons in a laser beat in the presence of an axial accelerating electric field and operating in a continuous pulse train (regenerative amplifier) mode is proposed. Some examples are shown based on ring optical resonator designs for both the wiggler and the signal radiation. The signal radiation is in a spectral region of tens of nanometers. A calculation of the parameters indicates that the technology required for an experiment is within the state of the art. Examples presented are based on a pump (wiggler) field produced by a continuously pulsed CO 2 or Nd:YAG laser and a continuous train of sub-ns electron beam pulses in the 0.4–2 MeV range. The signal builds up from an injected single pulse, which can be generated by high-harmonic (third, fifth) multiplication in the gas of a doubled (tripled) Nd:YAG laser or an excimer laser. The proposed scheme thus converts a single pulse of XUV radiation into a continuous train of pulses with high average power in the same wavelength region.
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