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Degenerate transverse modes are used to excite a field distribution with maximum on-axis intensity near the focus and avoiding a large on-axis aperture far away from the focus in a femtosecond resonator with finesse 3000.
Geometrical access to an enhancement cavity is presented, that could be used for output coupling of harmonics. No dispersion or nonlinearity for the fundamental radiation is introduced. Small diffraction losses allow for a finesse >3000.
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