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Proceedings Paper

Freeform optics design for Raman spectroscopy
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Paper Abstract

Freeform optics are known for their advantages regarding optical performance and system integration. The use of additive manufacturing methods for the rapid production of freeform optics opens up new possibilities for optical metrology. By easily varying the shape and size of optical elements, optical systems specifically adapted to various applications can be fabricated cost-effectively. We present cost-effective freeform polymer optics for the application in Raman spectroscopy which combines laser focusing, Raman scattering collection and a mounting thread within one component. The aspheric surfaces of the optics were designed in a customized simulation tool and optimized regarding to Fresnel losses. The prototypes were fabricated by using a polymer-based Multi-Jet Modeling process. These prototypes were evaluated regarding their geometrical and optical properties and were successfully implemented in a compact and custom-designed Raman spectroscopy system. The system was built based on a continuous wave excitation laser emitting at 785 nm with a maximum output power of 0.5 W and a spectrometer providing a Stokes Raman shift resolution of 6.7 cm-1.

Paper Details

Date Published: 2 March 2020
PDF: 10 pages
Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870A (2 March 2020); doi: 10.1117/12.2544708
Show Author Affiliations
Tobias Grabe, Leibniz Univ. Hannover (Germany)
Yang Li, Leibniz Univ. Hannover (Germany)
Henrik Krauss, Leibniz Univ. Hannover (Germany)
Alexander Wolf, Leibniz Univ. Hannover (Germany)
Junjun Wu, The Chinese Univ. of Hong Kong (Hong Kong, China)
Chenyu Yao, The Chinese Univ. of Hong Kong (Hong Kong, China)
Qiang Wang, The Chinese Univ. of Hong Kong (Hong Kong, China)
Roland Lachmayer, Leibniz Univ. Hannover (Germany)
Wei Ren, The Chinese Univ. of Hong Kong (Hong Kong, China)

Published in SPIE Proceedings Vol. 11287:
Photonic Instrumentation Engineering VII
Yakov Soskind; Lynda E. Busse, Editor(s)

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