Development and manufacturing of micro lens array diffuser for VCSEL with super-wide-angle distribution and high efficiency

Hirotaka Tsujii; Toshimitsu Takaoka; Kenta Ishii; Yasuhiro Tanabe; Toshiki Hamatani; Yuya Nakamura; Masanori Endo; Kohei Nakayama; Akio Takahashi; Syunya Ishii; Seiichiro Kitagawa

doi:10.1117/12.2649745

14 March 2023 Development and manufacturing of micro lens array diffuser for VCSEL with super-wide-angle distribution and high efficiency

Hirotaka Tsujii, Toshimitsu Takaoka, Kenta Ishii, Yasuhiro Tanabe, Toshiki Hamatani, Yuya Nakamura, Masanori Endo, Kohei Nakayama, Akio Takahashi, Syunya Ishii, Seiichiro Kitagawa

Author Affiliations +

Proceedings Volume 12417, Optical Components and Materials XX; 1241714 (2023) https://doi.org/10.1117/12.2649745
Event: SPIE OPTO, 2023, San Francisco, California, United States

Conference Poster

Abstract

Recently, the development of IoT technologies such as for autonomous driving and factory automation has been thriving. Both imaging devices and sensing devices that use optics are the most important devices among IoT technologies. When developing these devices, controlled light source is one of most important parts. There are not many reports of the development of single illumination optics with a super-wide-angle light distribution compared to camera lenses. Single illumination optics with super-wide-angle light distribution is desired for cost reduction and space saving of IoT device. However, it was difficult to make it with high efficiency and high uniformity due to severe requirement of geometrical tolerance and an increase of Fresnel reflection in large angle region. We report development and manufacturing of micro lens array diffuser with super-wide-angle distribution and high efficiency. Our optical design including an antireflection coating for super-wide-angle region could make the curvature of the lenslet low and enable us to manufacture this optics. In our design, it is achieved a super-wide-angle light distribution of about 170 degrees and high efficiency of about 80% using a micro-lens-array diffuser consisting of about 100-micron lenslet. And, we have realized a mass-produced product with high similarity between the micro lens array and the mold by using the technology to transfer the mold shape to the resin with high precision.

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Hirotaka Tsujii, Toshimitsu Takaoka, Kenta Ishii, Yasuhiro Tanabe, Toshiki Hamatani, Yuya Nakamura, Masanori Endo, Kohei Nakayama, Akio Takahashi, Syunya Ishii, and Seiichiro Kitagawa "Development and manufacturing of micro lens array diffuser for VCSEL with super-wide-angle distribution and high efficiency", Proc. SPIE 12417, Optical Components and Materials XX, 1241714 (14 March 2023); https://doi.org/10.1117/12.2649745

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