Thermal poling, first demonstrated in hulk silica- glass,1 is a well established technique for creating a second order optical nonlinearity (χ(2)) in centro-symmetric materials. Soon after the first demonstration in bulk glass, a χ(2) in thermally poled germano-silicate fibre was reported.2 Despite the relatively low χ(2) of 1 pm/V poled fibres represent an extremely attractive nonlinear medium, offering major advantages over more established crystalline materials in terms of waveguide length, damage threshold, loss and fabrication cost.

© 2001 Optical Society of America

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