Polarization analyzer using a plurality of Faraday rotators

Details Polarization analyzer using a plurality of Faraday rotators Polarization analyzer using a plurality of Faraday rotators

2005-05-10

2005-05-10

Lauchman, Layla (Department: 2877)

Optics: measuring and testing

By polarized light examination

With polariscopes

C356S365000, C250S225000

Reexamination Certificate

active

06891616

ABSTRACT:
Faraday rotators each have a Faraday element which rotates light and a magnetic field generator for applying a magnetic field to the Faraday element. A wavelength plate is disposed between the Faraday rotators and it retards the light. A polarizer transmits, of the light, light having a predetermined plane of polarization which has been rotated by the Faraday rotators and retarded by the wavelength plate. An optical receiver receives the light transmitted by the polarizer and outputs a light receiving signal which corresponds to the amount of light received. A signal generator outputs a control signal for polarizing the light to be measured into at least four polarization states to the magnetic field generator. A signal processor determines Stokes parameters which indicate the polarization state of the light to be measured based on the four polarization states, and the light receiving signal corresponding to each of the four polarization states.

REFERENCES:
patent: 4306809 (1981-12-01), Azzam
patent: 4681450 (1987-07-01), Azzam

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