Optical modulators using semiconductor nano-structures: Difference between revisions
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=== Acousto-optic modulator === | === Acousto-optic modulator === | ||
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A dc magnetic field Hdc is applied perpendicular to the light propagation direction to produce a single domain, transverse directed 4~Ms. The rf modulation field Hrf, applied by means of a coil along the light propagation direction, wobbles 4~Ms through an angle of @ and produces a time varying magnetization component in the longitudinal direction. This component then produces an ac variation in the plane of polarization via the longitudinal Faraday effect. Conversion to [[amplitude modulation]] is accomplished by the indicated analyzer. | A dc magnetic field Hdc is applied perpendicular to the light propagation direction to produce a single domain, transverse directed 4~Ms. The rf modulation field Hrf, applied by means of a coil along the light propagation direction, wobbles 4~Ms through an angle of @ and produces a time varying magnetization component in the longitudinal direction. This component then produces an ac variation in the plane of polarization via the longitudinal Faraday effect. Conversion to [[amplitude modulation]] is accomplished by the indicated analyzer. | ||
[[File:optical_mod2.jpg]] | |||