Electro-optical method for polarimetric measurement

Lázaro J. Miranda Díaz

doi:10.1117/12.892643

26 July 2011 Electro-optical method for polarimetric measurement

Lázaro J. Miranda Díaz

Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 800117 (2011) https://doi.org/10.1117/12.892643
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal

Abstract

When passing a pulsing beam of polarize light of a light emitter d iode (LED) or a semiconductor laser thru an optical system and two photodiodes spatially arranged at 90⁰ to each other and both with their detection surfaces parallel to the transmission shaft of light, and polarization axis oriented at 45⁰ of the vertices of the edges where the photodiodes join, in the outputs of two operational amplifiers, e have two signals with the same shape in time, i.e. a pulse train with the same phase, but when you turn the polarization plane, change the radiance of the light projected onto the photodiodes, being out of phase signals to the outputs of the amplifiers, where the d ifference between the fronts of the pulses is proportional to the angle of rotation of the plane of polarization of polarization light. In a digital circuit phase discriminator, a puls e is obtained equal to the time d ifference between two sides of the rise time in the output of two amplifiers. The width of this is directly proportional to the value of rotation the plane of polarization of light, that is, the greater the rotation, the greater the width of this.

Citation Download Citation

Lázaro J. Miranda Díaz "Electro-optical method for polarimetric measurement", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 800117 (26 July 2011); https://doi.org/10.1117/12.892643

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