From Event: SPIE Optical Engineering + Applications, 2016
Light pollution has become a prominent issue, specifically in National Parks such as Yosemite, where visitors go to
enjoy the natural ‘night sky’. In an effort to reduce light pollution, a particularly obtrusive light source has been
selected for retrofit. Using nonimaging optics and light emitting diodes (LEDs), light can be controlled to achieve a
desired prescribed illumination distribution. This distribution possesses a sharp cut-off such that light leakage is
minimal. Nonimaging optical designs are 3D printed, retrofitted into the candidate fixture, and tested in Yosemite
National Park. The end goal is to drastically reduce and even eliminate the excess light from sources around the
Melissa Ricketts, Jon Ferry, Lun Jiang, and Roland Winston, "Nonimaging optics in lighting to reduce light pollution," Proc. SPIE 9955, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIII—Commemorating the 50th Anniversary of Nonimaging Optics, 99550G (Presented at SPIE Optical Engineering + Applications: August 29, 2016; Published: 7 September 2016); https://doi.org/10.1117/12.2239506.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon