Second-harmonic microscopy has been successfully applied to characterize the second-order nonlinear layer in optical fibers thermally poled at 280 °C and 3.5 kV for 30 min. The nonlinear layer was found to be ∼5.1 µm deep under the anode and was not always centered about the closest point between the electrodes.
© 2005 Optical Society of America
(160.4330) Materials : Nonlinear optical materials
(160.6030) Materials : Silica
(190.1900) Nonlinear optics : Diagnostic applications of nonlinear optics
(190.4160) Nonlinear optics : Multiharmonic generation
Honglin An and Simon Fleming, "Characterization of a second-order nonlinear layer profile in thermally poled optical fibers with second-harmonic microscopy," Opt. Lett. 30, 866-868 (2005)