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arXiv 1603.04791physics.opticsphysics.atom-phquant-ph
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毫米长光纤法布里-珀罗腔

Millimeter-long Fiber Fabry-Perot cavities

Konstantin Ott, Sebastien Garcia, Ralf Kohlhaas, Klemens Schüppert, Peter Rosenbusch, Romain Long, Jakob Reichel

摘要:

我们展示了光纤法布里-珀罗(FFP)腔与凹面镜,可以在腔长为1.5毫米,而没有显着恶化的精细度。这是通过使用激光点加工技术来形成具有超低粗糙度的球面镜,并采用具有大模式面积的单模光纤以实现与腔体的良好模式匹配来实现的。此外,与以前的FFP相比,这些腔可以在具有足够涂层的倍频程跨越频率范围内使用。我们还直接表明,由光纤的折射率分布引起的形状偏差导致的精细度降低,如在早期尝试建立长FFP腔中观察到的,并显示了克服这个问题的方法。

英文摘要:

We demonstrate fiber Fabry-Perot (FFP) cavities with concave mirrors that can be operated at cavity lengths as large as 1.5mm without significant deterioration of the finesse. This is achieved by using a laser dot machining technique to shape spherical mirrors with ultralow roughness and employing single-mode fibers with large mode area for good mode matching to the cavity. Additionally, in contrast to previous FFPs, these cavities can be used over an octave-spanning frequency range with adequate coatings. We also show directly that shape deviations caused by the fiber's index profile lead to a finesse decrease as observed in earlier attempts to build long FFP cavities, and show a way to overcome this problem.

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