Millimeter-long fiber Fabry-Perot cavities.

@article{Ott2016MillimeterlongFF,
  title={Millimeter-long fiber Fabry-Perot cavities.},
  author={Konstantin Ott and S{\'e}bastien Garcia and Ralf Kohlhaas and Klemens Sch{\"u}ppert and P. Rosenbusch and Romain Long and Jakob Reichel},
  journal={Optics express},
  year={2016},
  volume={24 9},
  pages={
          9839-53
        }
}
We demonstrate fiber Fabry-Perot (FFP) cavities with concave mirrors that can be operated at cavity lengths as large as 1.5 mm 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… 
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