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A study on spatial filtering of a speckle image reflected from a scattering medium in a coherent beam combining system

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Abstract

We conducted a study to explore a real-time monitoring variable of a coherently combined beam returned from a scattering target. The effect of a spatial filtering on the speckle pattern generated from the interference of the scattered beam was examined in a coherent beam combining (CBC) system, including three-channel laser output, the scattering target, and receiver optics in free space. We were able to recognize the arrangement of the original beams from the speckle pattern by applying a proper spatial filter with a size of 2 mm. The power-in-the-bucket value in the monitoring system was also investigated as a function of the spatial filter size. Our research implies that a complex speckle pattern can be analyzed using spatial filtering to derive a single-output real-time variable in the CBC monitoring system.

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Acknowledgements

This work was supported by the specialized laboratory program of the Agency for Defense Development (ADD) in Republic of Korea (no. UD180040ID).

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Authors and Affiliations

  1. Department of Energy Systems Research, Ajou University, Suwon, 16499, Korea

    Jaedeok Park, Yunjin Choe & Dong-Il Yeom

  2. Department of Physics, Ajou University, Suwon, 16499, Korea

    Dong-Il Yeom

Authors
  1. Jaedeok Park
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  2. Yunjin Choe
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  3. Dong-Il Yeom
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Correspondence to Dong-Il Yeom.

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Park, J., Choe, Y. & Yeom, DI. A study on spatial filtering of a speckle image reflected from a scattering medium in a coherent beam combining system. J. Korean Phys. Soc. 78, 657–661 (2021). https://doi.org/10.1007/s40042-021-00131-0

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  • DOI: https://doi.org/10.1007/s40042-021-00131-0

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