Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-14-18060
Timestamp: 2019-04-24 05:09:41+00:00

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We study the creation and erasure of the linear electrooptical effect in silicate fibers by optical poling. Carriers are released by exposure to green light and displaced with simultaneous application of an internal dc field. The second order nonlinear coefficient induced grows with poling bias. The field recorded (~108 V/m) is comparable to that obtained through classical thermal poling of fibers. In the regime studied here, the second-order nonlinearity induced (~0.06 pm/V) is limited by the field applied during poling (1.2 × 108 V/m). Optical erasure with high-power green light alone is very efficient. The dynamics of the writing and erasing process is discussed, and the two dimensional (2D) field distribution across the fiber is simulated.
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Fig. 1 Experimental set-up used for optical creation and erasure of the electrooptical effect in silica fibers.
Fig. 2 (a) Oscilloscope trace showing response of Sagnac interferometer with electrooptical fiber to the application of a 100 ns 1.5 kV pulse; (b) Amplitude of optical signal switched as a function of applied voltage. The red solid curve is fitted to the (black) experimental points using Eq. (1) below.
Fig. 3 (a) Increase in χ(2)eff for two average power intensities (17 mW and 8.5 mW); (b) Time evolution of χ(2)eff for consecutive poling procedures. After 6 minutes the exciting beam is realigned and subsequently the nonlinear coefficient reaches the same value as in the second poling; (c) Dependence of signal amplitude Vm on poling voltage. The Kerr effect ensures that the signal is non-zero even before poling starts. The phase-shift grows with poling voltage.
Fig. 5 (a) Decrease of measured signal Vm from Sagnac interferometer; (b) Corresponding erasure of the effective χ(2) (black dots). Two fitting curves are shown. The blue line indicates an exponential decay where fit is poor for early times, and the red curve follows the function (at + b)−2 , which deviates from the data for longer times. (c) Decay of χ(2) under green light exposure plotted on a semi-log scale, with the fitting curves and data from Fig. 5(b).
Fig. 6 Spatial distribution of electrical potential (top row), electric field (middle row) and potential (blue) and field magnitude (red) along a horizontal line through the center of the core (bottom row). (a-c) before poling; (d-f) after poling is completed, the green excitation is switched-off but the high voltage is still applied to the electrodes; and (g-i) after the high voltage bias is switched off and the fiber is in steady-state with grounded electrodes.

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