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Angular dependence of screen speckle and fiber speckle of coupled output of nine high-power blue laser diodes through a multi-mode fiber

  • Special Section: Regular Paper
  • Laser Display and Lighting Conference (LDC'15), Yokohama, Japan
  • Published:
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Abstract

Angular dependence of speckle contrast of speckle pattern projected out of a multi-mode fiber connected to a high-power blue laser module is investigated. The laser module has nine high-power InGaN/GaN blue laser diodes arranged in a three-by-three array. Each of the arrayed laser diodes have slightly different incident angle to the fiber. We have successfully extracted the fine screen speckle pattern from the projected pattern mixed up with the coarse fiber speckle pattern by processing the measured data. It is found that the speckle contrast of the both screen and fiber speckles are larger around the center area where the guided-light component closest to the paraxial direction is projected. This is because the output of the center laser in the array is likely to couple into the paraxial mode more than the rest. Speckle contrast behaviors when applying the speckle reduction methods, fiber vibration, diffuser, and spinning diffuser are also investigated.

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Acknowledgments

The authors thank Mr. T. Fukui, Dr. S. Kubota, Oxide Corporation, and Prof. K. Kuroda, Utsunomiya University for their useful advice and discussion.

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Authors and Affiliations

  1. Photon Pioneers Center, Osaka University, 2-8 Yamada-oka, Suita, Osaka, 565-0871, Japan

    Junichi Kinoshita, Hitoshi Aizawa, Akira Takamori & Kazuhisa Yamamoto

  2. Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyamacho, Toyonaka, Osaka, 560-8531, Japan

    Hiroshi Murata

  3. Shimadzu Corporation, 2385-13 Iiyama, Atsugi, Kanagawa, 243-0213, Japan

    Koji Tojo

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  1. Junichi Kinoshita
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  2. Hitoshi Aizawa
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  3. Akira Takamori
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  4. Kazuhisa Yamamoto
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  5. Hiroshi Murata
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  6. Koji Tojo
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Correspondence to Junichi Kinoshita.

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Kinoshita, J., Aizawa, H., Takamori, A. et al. Angular dependence of screen speckle and fiber speckle of coupled output of nine high-power blue laser diodes through a multi-mode fiber. Opt Rev 23, 121–132 (2016). https://doi.org/10.1007/s10043-015-0150-1

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  • DOI: https://doi.org/10.1007/s10043-015-0150-1

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