Polarising fibres (PZ) only allow one polarisation of light to propagate along the fibre; the other polarisation will experience high losses. This is different to a polarisation maintaining fibre (PM) which will support propagation of both polarisations. PZ fibres have a specific waveguide design and a high birefringence so that the cut-off wavelength for the two polarisations is different. Coiling the fibre introduces higher losses for one of the polarisations so PZ fibres can be used to create a high extinction ratio ‘all-fibre’ polarisers.
LASER COMPONENTS’ partner ixFiber can offer the polarising fibre or polarising modules suited to your application. The modules have the correct design of fibre and coil diameter to produce polarisers with a high extinction ratio (>30dB), large bandwidth (>80nm), and low loss. The modules are available for a range of wavelengths, with a variety of connector options. They are particularly useful in polarisation-sensitive applications including laser cooling atom trapping.