Freeform optical elements are receiving increased attention for illumination applications due to their capacity to tailor light output precisely, enhancing visual aspects and energy efficiency. While software tools for designing freeform surfaces have been available, it is the recent integration of these capabilities into comprehensive illumination design software that marks a significant advancement. This integration makes the design and application of reflective and refractive freeform optical elements a more accessible and practical undertaking for numerous illumination applications and designers.
Synopsys has recently launched the Freeform Designer as part of its LightTools illumination design software, incorporated within the Advanced Design Module. This tool facilitates the calculation of freeform reflective and refractive surfaces based on specified light distribution targets, source angle characteristics, and geometric parameters. The fundamental principle behind the design process is the mapping of the source’s angular light distribution to a desired target distribution, which can be either angular or spatial depending on the application requirements. By understanding the light distribution on the freeform surface in relation to position and incoming angle, the surface can be shaped to ensure the outgoing light achieves the intended target distribution, whether directed onto a specific surface or within a defined angular space. Although conceptually straightforward, the implementation of this mapping can be complex, particularly without symmetrical conditions. Nonetheless, the approach is effective in generating surfaces applicable for both simple and intricate target distributions.
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