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A passively modelocked 832 nm vertical-external-cavity surface-emitting laser, producing pulses of a duration of 15.3 ps at a repetition rate of 1.9 GHz, has been demonstrated. A fast surface-recombination semiconductor saturable absorber mirror, with a bi-temporal absorption recovery characteristic, consisting of fast and slow time constants of 1.5 and 200 ps, respectively, was used to form the pulses.
The radiation fields of a 4-arm Archimedean spiral antenna excited with three types of balanced mode, M1(1, j, ?1, ?j), M2(1, ?1, 1, ?1) and M3(1, ?j, ?1, j), are evaluated on the basis of the current distributions which are determined numerically. An axial beam and conical beams are presented with experimental results. It is demonstrated that an axial ratio of less than 3 dB can be obtained over...
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