Journal of Electronic Materials

, Volume 4, Issue 2, pp 223–241 | Cite as

Faraday rotation, optical isolation and modulation at 10.6 μm using hot-pressed CdCr2S4 and CoCr2S4

  • S. D. Jacobs
Article
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Abstract

Measurements performed on hot-pressed samples of ferromagnetic CdCr2S4 and ferrimagnetic CoCr2S4 indicate that they would be useful as optical isolators and modulators for CO2 lasers at 10.6 μm. Based on the Faraday effect, large aperture devices could be fabricated which would operate under modest cooling and drive power requirements. The various figures of merit needed to evaluate the performance of these materials as isolators and modulators have been determined optically with a low power CO2 laser. D.C. applied magnetic fields were used to determine the variations in measured Faraday rotation as a function of sample thickness. Figures of merit pertinent to isolation were also obtained, such as the passive extinction ratio and forward to backward transmitted energy ratio. A.C. applied magnetic fields were used to determine the frequency response of the materials, their modulation depths, and drive powers up to 100 kHz. Short duration pulses were used to analyze higher frequency behavior.

Key words

Optical modulation Optical isolation CO2 laser Faraday rotation Hot-pressed CdCr2S4 and CoCr2S4 
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Copyright information

© American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc 1975

Authors and Affiliations

  • S. D. Jacobs
    • 1
  1. 1.Institute of OpticsUniversity of RochesterRochester

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