Freeform optics design for Raman spectroscopy

Tobias Grabe; Yang Li; Henrik Krauss; Alexander Wolf; Junjun Wu; Chenyu Yao; Qiang Wang; Roland Lachmayer; Wei Ren

doi:10.1117/12.2544708

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2 March 2020 Freeform optics design for Raman spectroscopy

Tobias Grabe, Yang Li, Henrik Krauss, Alexander Wolf, Junjun Wu, Chenyu Yao, Qiang Wang, Roland Lachmayer, Wei Ren

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Proceedings Volume 11287, Photonic Instrumentation Engineering VII; 112870A (2020) https://doi.org/10.1117/12.2544708
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

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Tobias Grabe, Yang Li, Henrik Krauss, Alexander Wolf, Junjun Wu, Chenyu Yao, Qiang Wang, Roland Lachmayer, and Wei Ren "Freeform optics design for Raman spectroscopy", Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870A (2 March 2020); https://doi.org/10.1117/12.2544708

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