Abstract
A parametric optimization method is proposed in the design of a high-efficiency free-form
illumination system. The proposed method is intended to provide rectangular uniform illumination
with a light emitting diode (LED) source. An initial illumination system is first constructed and
parameterized. The parameters of the initial system are optimized according to actual simulation
results, and one design sample is presented. A liquid crystal on silicon (LCoS) micro-projector test
module is fabricated and tested based on the design sample. Compared with the conventional
micro-projectors using rotational symmetry devices, the micro-projector system designed with the
parametric optimization method can send 1.65 times the source power to the LCoS active area with a
4:3 target ratio, and the uniformity reaches 98%.
© 2012 Chinese Optics Letters
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