Dual-wavelength fiber Fabry-Perot cavities with engineered birefringence.

  title={Dual-wavelength fiber Fabry-Perot cavities with engineered birefringence.},
  author={S{\'e}bastien Garcia and Francesco Ferri and Konstantin Ott and Jakob Reichel and Romain Long},
  journal={Optics express},
  volume={26 17},
We present a method to engineer the frequency splitting of polarization eigenmodes in fiber Fabry-Perot (FFP) cavities. Using specific patterns of multiple CO2 laser pulses, we machine paraboloidal micromirrors with controlled elliptical shape in a large range of radii of curvature. This method is versatile and can be used to produce cavities with maximized or near-zero polarization mode splitting. In addition, we realize dual-wavelength FFP cavities with finesse exceeding 40 000 at 780 nm and… 

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