Abstract:A novel class of ring unstable resonators (UR90) with 90-deg rotation of the beam on each round-trip has been proposed as a method of avoiding disadvantages of obscuration in the output beam. We herein consider extension of this idea to include an internally focused beam, so that the portion of the beam near the focus can fit within the narrow gain region of a free electron laser. Modeling of transverse mode properties of empty cavities with or without an internal focus proceeds in the same general way. We hav… Show more
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