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Updated: May 11, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

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High resolution irradiance tailoring using multiple freeform surfaces.

Adrien Bruneton¹, Axel Bäuerle, Rolf Wester

¹Technology of Optical Systems, RWTH Aachen University, 52056 Aachen, Germany.

|May 15, 2013

Summary

This study introduces an efficient optimization method for designing freeform optics. The new approach enables the creation of compact optical systems capable of projecting high-resolution irradiance patterns, such as logos.

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Last Updated: May 11, 2026

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Area of Science:

Optical engineering
Freeform optics design

Background:

Lighting applications increasingly demand custom optics for specific radiant intensity or irradiance distributions.
Freeform optics offer compact solutions for achieving these specialized optical functionalities.
Previous work established ray mapping as a viable method for designing multiple freeform surfaces.

Purpose of the Study:

To extend previous freeform optics design methods by introducing an efficient, physics-based optimization procedure.
To enable the design of multiple freeform surfaces for precise irradiance pattern projection.
To demonstrate the capability of rendering high-resolution irradiance patterns.

Main Methods:

Development of an efficient optimization procedure grounded in the physics of the optical system.
Application of the procedure to design multiple freeform optical surfaces.
Utilizing ray mapping principles for computational optical design.

Main Results:

Successful design of optical systems incorporating multiple freeform surfaces.
Demonstration of the ability to render high-resolution irradiance patterns.
Design of a two-freeform-surface lens capable of projecting a detailed logo (530 × 160 pixels).

Conclusions:

The proposed optimization procedure is effective for designing complex freeform optics.
This method allows for the creation of compact optical systems with high-resolution pattern projection capabilities.
The approach advances the design of custom optics for advanced lighting applications.