Transverse-mode coupling and diffraction loss in tunable Fabry-Perot microcavities

被引：60
作者：
Benedikter, Julia [1 ,2 ]
Huemmer, Thomas [1 ,2 ]
Mader, Matthias [1 ,2 ]
Schlederer, Benedikt [1 ,2 ]
Reichel, Jakob [3 ]
Haensch, Theodor W. [1 ,2 ]
Hunger, David [1 ,2 ]
机构：
[1] Univ Munich, Fak Phys, D-80799 Munich, Germany
[2] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
[3] Univ Paris 06, CNRS, Lab Kastler Brossel, F-75005 Paris, France
来源：
NEW JOURNAL OF PHYSICS | 2015年 / 17卷
关键词：
Fabry-Perot resonators; fiber cavities; diffraction; mode coupling; OPTICAL CAVITY; FINESSE;
D O I：
10.1088/1367-2630/17/5/053051
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report on measurements and modeling of the mode structure of tunable Fabry-Perot optical microcavities with imperfect mirrors. We find that non-spherical mirror shape and finite mirror size leave the fundamental mode mostly unaffected, but lead to loss, mode deformation, and shifted resonance frequencies at particular mirror separations. For small mirror diameters, the useful cavity length is limited to values significantly below the expected stability range. We explain the observations by resonant coupling between different transverse modes of the cavity and mode-dependent diffraction loss. A model based on resonant state expansion that takes into account the measured mirror profile can reproduce the measurements and identify the parameter regime where detrimental effects of mode mixing are avoided.
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页数：9
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