2x2 Fiber-optic Rotary Joint

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  • 2x2 Fiber-optic Rotary Joints connect two independent fiber-optic on the stator side with their respective counterparts on the rotor. This innovative patent-pending technology offers unprecedented possibilities for laser-based optogenetics lighting requiring a compact and low loss dual-channel fiber-optic rotary joint. It makes possible optogenetics experiments with independent control of two different sites of illumination and/or detection of the light.

    There are 2 different options for the lenses used inside this rotary-joint;

    • AD (Achromatic Doublet): This configuration uses achromatic doublet lenses to ensure consistent performance on the entire visible range from 450 to 650 nm, fiber-optic numerical aperture is limited to NA 0.22.  This is ideal for use with a multimode fiber-coupled laser.
    • AH (Aspheric High NA): This configuration uses aspheric lenses to allow usage of fiber-optic with high numerical aperture that are used with LED or Ce:YAG light sources.  This configuration works at other wavelengths but is optimized at 530 nm.

    The two optical inputs use a standard FC connector, while the optical output uses two M3 receptacles. Each optical channel is independent and features no crosstalk. This rotary joint is optimal for use in optogenetics, allowing two regions of the brain to be activated independently.

  • Transmission > 50 % (60% typical)
    tested with 200 µm core - NA0.22
    Maximum variation less than 3 % peak-to-peak
    Wavelength range 450 - 650 nm
    Input Connectors 2x FC receptacle
    Output Connectors 2x M3 receptacle
    Start up Torque < 3000 µN·m
    too high for mice but acceptable for rats or larger animals