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. 2015 Dec 21;5:18690. doi: 10.1038/srep18690

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Copyright © 2015, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Schematic illustration of light distribution measurement system, and light distribution in polar coordinate of the phosphorous diffuser divergent blue LD (a) Angle-dependent light field measurement setup, which consists a rotating-arm, a lens-fiber to collect light, and a monochromator. (b) White light distribution of the phosphorous diffuser divergent blue LD in polar coordinate. (c,d) Light distribution in polar coordinate of blue LD (deep blue curve), phosphor scattered blue (light blue curve) and yellow (yellow curve) luminescent components within the divergent white-light spot. With the radiant angle ranged from −90^o to 90^o, these patterns were taken along long and short axes. Both results show lambertian-like distribution for the divergent white light. For the separated part of blue and yellow light, the distributions show much intense distribution at 0^o because of the highly coherent blue light beam, accompanied with divergent lambertian-like distribution at other angles.