This paper provides research progress in the development of fast electro-optic gratings for laser beam attenuations and in free space optical (FSO) communications involving mobile terminals. The electrooptic phase grating is formed by the phase separation of ~100nm liquid crystals droplets from a polymerizing organic matrix using holographic interference technique. The formed grating separates the incident laser beam into the output beams: the transmitted and diffracted beam, whose intensities can be electrically adjusted through electro-optic effect. The fast electro-optic gratings have a very fast electro-optic response time of 50 ¿s with diffraction efficiency above 99.8%. Optical receivers used in FSO have a limited dynamic range and there is a need for in-line variable attenuators to keep the signal levels from overloading the receiver. These attenuators should be continuous, provide sufficient attenuation, and also provide a low insertion loss for weak signal reception. The use of electro-optic phase gratings is one solution to meet the requirements for an in-line attenuator for FSO.
Fast Electro-Optic Gratings for Laser Beam Attenuations
2007-03-01
8975386 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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