Efficient, extremely low frequency acousto-optic shifter for optical heterodyning applications

Attila Barocsi, Laszlo Jakab, Peter Richter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Optical heterodyne detection requires frequency shift of an optical beam, which can be realized using an acousto-optic modulator (AOM) that shifts the frequency of the diffracted beam with the acoustic frequency (from several tens of MHz, typically). Low frequency shift can be achieved using two, consecutively placed, modulators driven with slightly different frequencies. This configuration, however, results in lower efficiency and higher complexity. To avoid these problems and extremely low frequency, TeO2 based, single cell AOM have been developed. The AOM performance has carefully been investigated and design considerations maintaining the high diffraction efficiency are given. The suppression of the unwanted effects arisen from low frequency operation, such as presence of multiple diffraction orders, elliptical distortion of the diffracted beam, has been examined. The special anisotropic diffraction geometry allows a frequency shift as low as 5 MHz with diffraction efficiency greater than 85% (> 90% at 8 MHz), simultaneously, as it has been demonstrated.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsDennis R. Pape
PublisherPubl by Society of Photo-Optical Instrumentation Engineers
Pages108-113
Number of pages6
ISBN (Print)081941544X
Publication statusPublished - Dec 1 1994
EventAdvances in Optical Information Processing VI - Orlando, FL, USA
Duration: Apr 6 1994Apr 7 1994

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume2240
ISSN (Print)0277-786X

Other

OtherAdvances in Optical Information Processing VI
CityOrlando, FL, USA
Period4/6/944/7/94

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Barocsi, A., Jakab, L., & Richter, P. (1994). Efficient, extremely low frequency acousto-optic shifter for optical heterodyning applications. In D. R. Pape (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (pp. 108-113). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2240). Publ by Society of Photo-Optical Instrumentation Engineers.