The FEMTOWHITE 800 is a polarization-maintaning supercontinuum device for use with 800 nm femtosecond lasers. It contains 12 cm highly nonlinear, polarization-maintaning photonic crystal fiber with zero dispersion at 750 nm. The fiber ends are sealed and mounted in quartz ferrules, which are PM aligned to a line on the end of the device. The nonlinear fiber is mounted in a robust aluminum housing which can be easily mounted on a translation stage. The device features build-in beam expansion at the end facets, facilitating easy coupling and a high damage threshold.