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Cavity enhanced optical spectroscopy with a cavity having a predetermined deviation from a mode degeneracy condition
Cavity enhanced optical spectroscopy with a cavity having a predetermined deviation from a mode degeneracy condition
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机译:腔增强光学光谱,其腔与模式简并条件有预定偏差
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摘要
Improved ease of mode matching to a passive optical cavity is provided by selecting a cavity design that has a predetermined deviation from a reference cavity design having high transverse mode degeneracy. This predetermined deviation tends to be small, so that the first overlap of high-order transverse modes with the lowest order transverse mode in frequency occurs at relatively high transverse mode numbers. Coupling to high-order transverse modes is thereby reduced, since high-order transverse modes having relatively high transverse mode numbers tend to be more difficult to couple to, and tend to have high loss. During assembly of such a cavity, it can be useful to apply a perturbation to the cavity to further optimize mode matching. For example, the length of an enclosed cavity can be adjusted by altering the number and/or length of spacers in the cavity housing.
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