Reducing residual amplitude modulation in electro-optic phase modulators by erasing photorefractive scatter

Sathian, Juna & Jaatinen, Esa (2013) Reducing residual amplitude modulation in electro-optic phase modulators by erasing photorefractive scatter. Optics Express, 21(10), pp. 12309-12317.

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Residual amplitude modulation (RAM) is an unwanted noise source in electro-optic phase modulators. The analysis presented shows that while the magnitude of the RAM produced by a MgO:LiNbO3 modulator increases with intensity, its associated phase becomes less well defined. This combination results in temporal fluctuations in RAM that increase with intensity. This behaviour is explained by the presented phenomenological model based on gradually evolving photorefractive scattering centres randomly distributed throughout the optically thick medium. This understanding is exploited to show that RAM can be reduced to below the 10-5 level by introducing an intense optical beam to erase the photorefractive scatter.

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ID Code: 61347
Item Type: Journal Article
Refereed: Yes
Keywords: electro-optic devices, photorefractive optics, phase modulation, lithium niobate
DOI: 10.1364/OE.21.012309
ISSN: 1094-4087
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Nonlinear Optics and Spectroscopy (020503)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Optical Society of America
Copyright Statement: This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Deposited On: 15 Jul 2013 00:48
Last Modified: 17 Jul 2013 10:07

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