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Suppressed speckle contrast of blue light emission out of white lamp with phosphors excited by blue laser diodes for high-brightness lighting applications

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Abstract

The speckle contrast of blue light emission out of high-brightness white lamps using phosphors excited by InGaN/GaN blue laser diodes is evaluated as a measure of coherence. As a result, speckle contrast of as low as 1.7%, the same level as a blue light emitting diode, is obtained. This implies that the original blue laser light can be converted into incoherent light through lamp structures without any dynamic mechanisms. This unique speckle-free performance is considered to be realized by multiple scattering inside the lamp structure, the multi-longitudinal mode operation of the blue laser diodes, and the use of multiple laser diodes. Such almost-incoherent white lamps can be applied for general lighting without any nuisance of speckle noise and should be categorized as lamps rather than lasers in terms of laser safety regulation.

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Authors and Affiliations

  1. R&D Center (Imabari Complex), Toshiba Lighting & Technology Corporation, Imabari, Ehime, 794-8510, Japan

    Junichi Kinoshita, Yoshihisa Ikeda, Yuji Takeda, Misaki Ueno, Yoji Kawasaki, Yoshiaki Matsuba & Atsushi Heike

Authors
  1. Junichi Kinoshita
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  2. Yoshihisa Ikeda
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  3. Yuji Takeda
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  4. Misaki Ueno
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  5. Yoji Kawasaki
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  6. Yoshiaki Matsuba
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  7. Atsushi Heike
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Corresponding author

Correspondence to Junichi Kinoshita.

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Kinoshita, J., Ikeda, Y., Takeda, Y. et al. Suppressed speckle contrast of blue light emission out of white lamp with phosphors excited by blue laser diodes for high-brightness lighting applications. OPT REV 19, 427–431 (2012). https://doi.org/10.1007/s10043-012-0072-0

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  • DOI: https://doi.org/10.1007/s10043-012-0072-0

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