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http://dx.doi.org/10.3807/KJOP.2020.31.6.268

Study of Monitoring Parameters for Coherent Beam Combination through Fourier-domain Analysis of the Speckle Image  

Park, Jaedeok (Department of Energy Systems Research, Ajou University)
Choe, Yunjin (Department of Energy Systems Research, Ajou University)
Yeom, Dong-Il (Department of Energy Systems Research, Ajou University)
Publication Information
Korean Journal of Optics and Photonics / v.31, no.6, 2020 , pp. 268-273 More about this Journal
Abstract
We analyze the characteristics of the coherent beam combination of lasers by monitoring the speckle pattern of the beam reflected from a scattering medium. Three collimated laser sources with high coherence are focused on a scattering target using a lens, and we then examine the speckle pattern of the returned beam in the Fourier domain. We observe that the size of the speckle pattern changes, depending on the focused-beam size or degree of spatial overlap of the three beams. Furthermore, through Fourier-domain analysis of the speckle pattern we obtain the monitoring variable to qualify the efficiency of the coherent beam combination.
Keywords
Fiber lasers; Laser beam combination; Coherence optical effects; Speckle effect;
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