We fabricated transmissive optical diffusers with a randomized concavo-convex surface that was designed to control the irradiation distribution and can be fabricated easily. The diffusers were molded from acrylic using the mold cores machined by ultraprecision cutting or milling. Less stray light was observed from the diffuser molded with the cutting core compared with the milling core. As the Fourier optics simulation was consistent with the measured distribution, it was beneficial for the design evaluation of diffusers. Furthermore, we molded a Penrose-tiling micro-lens-array to generate uniform light distribution without random displacement of each lens. The measurement results showed the feasibility of the Penrosetiling micro-lens-array as a diffuser.
Toru Inomata, Daisuke Seki, Masato Okano, Kazuya Yamamoto, Yukinobu Nishio, Yuya Nakamura, Atsuhiko Nishihara, and Seiichiro Kitagawa, "Fabrication of optical diffusers with randomized periodic units using ultraprecision machining," Proc. SPIE 10544, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XI, 105440O (Presented at SPIE OPTO: January 29, 2018; Published: 22 February 2018); https://doi.org/10.1117/12.2289344.
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