Laser assisted thermo-electric poling of ferroelectric material

Details Laser assisted thermo-electric poling of ferroelectric material Laser assisted thermo-electric poling of ferroelectric material

1994-04-12

1999-01-05

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 45, G02F 113

Patent

active

058568808

ABSTRACT:
A ferroelectric material 44 is selectively poled using laser light 14 capable of being absorbed by the material 44, a shutter 18 for turning the light on and off, a variable attenuator 28, with a beam splitter 31 and an optical detector 31a, to set the laser power level, a lens 32 to provide focused laser light 14d, a mirror 36 driven by a motor 40 (mirror-scanner) to direct the light to the regions to be poled, and an electric field applied by electrodes 68, 70. A computer 24 provides automatic control over selective poling of the material 44 by controlling the shutter 18, variable attenuator 28, mirror 36 position, and the direction of the applied electric field. A temperature sensor 52 provides temperature feedback to ensure proper laser power and dwell time. In the alternative, the material 44 is covered with a mask 604 and scanned with the laser to provide selective pole reversal.

REFERENCES:
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patent: 5106211 (1992-04-01), Chiang et al.
patent: 5171400 (1992-12-01), Magel et al.
patent: 5205904 (1993-04-01), Yamamoto et al.

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