Evanescent Access Blocks (903/903P and 953/953P)

Similar to a half coupler, the fiber is embedded in a glass substrate and polished to within a few microns of the core leaving a nominally flat surface. The fiber can be contacted with liquid or pliable materials. Vacuum coatings can be applied but the substrate temperature must not exceed 80 deg. C.

Nominal face size 903/903P 1 x 0.23 inches
953/953P 0.75 x 0.1 inches

The fiber has a radius of curvature of 3.5 inches through the contact area. Polishing depth is measured as an attenuation of the transmitted light by coupling out to a bulk material of matching beta to the waveguide. It is not possible to give an accurate cladding thickness value at the apex of the interaction zone as the core is not an ideal box car shape and there can be a depressed index inner-cladding.

Coupling-out up to 99% at a specific wavelength to a tolerance of 0.5 is standard +/- 0.25 or better on special orders.

Many wavelengths and fiber types are available and therefore small quantities are available from stock if a recent larger batch has been made. If stock is not available, then a minimum qty of 10 is required for a special order.

Blocks have 1m pigtails and can be optionally terminated with connectors.