Optical attenuator

Details Optical attenuator Optical attenuator

1997-01-24

1999-03-30

Spyrou, Cassandra

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359281, 359283, G02F 109

Patent

active

058896090

ABSTRACT:
A specific polarized light component out of a light wave passed through a magneto-optic crystal, for example, YIG is extracted by a polarizer. The intensity of the light beam output from the polarizer depends on strength and direction of magnetic fields applied to the magneto-optic crystal. The magneto-optic crystal is applied with a first and a second magnetic field acting in directions different from each other. The strength of the composite magnetic field of the first and the second magnetic fields is set to exceed a predetermined value at all times. By varying at least one of the first and second magnetic fields, the attenuation factor in the magneto-optic crystal can be changed continuously and with good reproducibility.

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