Optical design of f-theta lens for dual wavelength selective laser melting

Lianhua Feng; Hongzhong Cao; Ning Zhang; Xiping Xu; Xuanming Duan

doi:10.1117/12.2246995

19 October 2016 Optical design of f-theta lens for dual wavelength selective laser melting

Lianhua Feng, Hongzhong Cao, Ning Zhang, Xiping Xu, Xuanming Duan

Proceedings Volume 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation; 101541L (2016) https://doi.org/10.1117/12.2246995
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

F-theta lens is an important unit for selective laser melting (SLM) manufacture. The dual wavelength f-theta lens has not been used in SLM manufacture. Here, we present the design of the f-theta lens which satisfies SLM manufacture with coaxial 532 nm and 1030 nm~1080 nm laser beams. It is composed of three pieces of spherical lenses. The focal spots for 532 nm laser and 1030 nm~1080 nm laser are smaller than 35 μm and 70 μm, respectively. The results meet the demands of high precision SLM. The chromatic aberration could cause separation between two laser focal spots in the scanning plane, so chromatic aberration correction is very important to our design. The lateral color of the designed f-theta lens is less than 11 μm within the scan area of 150 mm x 150 mm, which meet the application requirements of dual wavelength selective laser melting.

Citation Download Citation

Lianhua Feng, Hongzhong Cao, Ning Zhang, Xiping Xu, and Xuanming Duan "Optical design of f-theta lens for dual wavelength selective laser melting", Proc. SPIE 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation, 101541L (19 October 2016); https://doi.org/10.1117/12.2246995

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