Sharp focusing of superpositions of Hermite-Gaussian modes locked in fractionally degenerate cavityстатья
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Дата последнего поиска статьи во внешних источниках: 20 декабря 2019 г.
Аннотация:We investigate, experimentally and numerically, sharp focusing of superpositions of Hermite–Gaussian modes obtained at transverse mode locking in an end-pumped laser with a fractionally degenerate cavity. Being focused with a lens, these beams create quasi-waists that are shorter and narrower as compared to the waist of a zero-order Gaussian mode. Comparison with the case of Laguerre–Gaussian superpositions showed that both mode families demonstrate similar sharp-focusing behavior in terms of the longitudinal and transverse scales, but the superpositions of Hermite–Gaussian modes have substantially non-zero on-axis intensity between the quasi-waists.