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Electro-optical device constructed from a crystal with attached electrodes used to modulate a laser beam. A phase delay of a laser transmitting through the crystal is modulated by applying a variable electric voltage, causing birefringence. The change is proportional to the square of the field, which is known as the Kerr effect.
See also Huygenian Eyepiece , Periplan Eyepiece , Wide-Field Eyepiece , Pockels Cell , Q-Switching
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