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.
Adaptive headlamps with innovative lighting functionalities can increase traffic safety. Subtractive light modulators such as Digital-Micromirror-Devices (DMD), liquid crystal displays (LCD) or liquid crystal on silicon devices (LCoS) are considered to be used as an implementation with a high resolution. In order to realize the regulated light distribution as well as to improve the optical efficiency and on-road projection quality of such headlamp systems, an inhomogeneous illumination on the modulator and whereafter low distortion projection optics are considered. In this paper we present simulation results of an optical concept of inhomogeneous illumination for headlamps.