25 September 2014 Laser beam shaping with nano-structured lens
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Abstract
Laser beam shaping is a widely used technique in many application areas, such as material processing, lithography, optical data storage, and medical procedures. In most cases a laser beam shaping system consists of conventional lenses with curved surfaces. However these lenses are bulky and their fabrication precisions are limited. In this work, we design and fabricate a lens for laser beam shaping using nanostructures. The lens is designed with traditional geometrical optical methods, using energy conservation and optical coordinate transformation algorithms. But instead of using curved surfaces to implement the lens design, we realize the designs with dielectric nanostructures. The lens is then fabricated using electron beam lithography to achieve a high precision. The fabricated lens has very low profile and is capable of fine tuning laser beams. The lens is then experimentally tested. In the experimental setup a laser beam is directed into a multimode fiber and the irradiance of the output beam irradiance profile is measured. Then the lens is placed in front of the multimode fiber and the outcome beam irradiance profile is measured again to test the effects of our laser beam shaping lens.
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Zhengtong Liu, Zhengtong Liu, Eng Huat Khoo, Eng Huat Khoo, Chun Yong Ngo, Chun Yong Ngo, Liying Hong, Liying Hong, Rui Fen Wu, Rui Fen Wu, Jing Hua Teng, Jing Hua Teng, } "Laser beam shaping with nano-structured lens", Proc. SPIE 9194, Laser Beam Shaping XV, 91940L (25 September 2014); doi: 10.1117/12.2061665; https://doi.org/10.1117/12.2061665
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