Design and optimization of a generalized wide-bandwidth white light system for Light-Eye Technology (LeyeT)

The Light-Eye Technology (LeyeT) has been developed to provide a generalized light source for various biomedical applications. The LeyeT system is designed for the purposes of uniform light, light with specific wavelength, controllable size of light, etc. Multiple high-directionality single-Watt light-emitting diodes (LED) are packed together and integrated to deliver a wide-bandwidth white light source. The light uniformity is optimized with respect to the arrangement of LEDs and the controlled currents. The mixed light is then directed to a series of optical devices, including lenses, filters, grating, etc., to synthesize the light of the system. A system optimization is necessary to maintain the performance of system light. The light spectrum is analyzed numerically using a Monte Carlo ray tracing method and verified experimentally using an integrated sphere with a spectrometer. Each optical component is designed and built separately but every local performance is mutually coupled with each other. The system is therefore decomposed into several subsystems while the system target is assigned to each subsystem. Each subsystem finds the new design point along the gradient direction of the local constraint and responds back to the system. Using this Gradient-based Transformation Method (GTM), the optimal design variables are to be found efficiently due to the monotonic characteristics of the gradient-based transformed formulations. The design and optimization of the LeyeT system is been developing to provide the desired generalized light source, which is controllable and optimized for various biomedical applications. In this paper, the design and optimization of the generalized wide-bandwidth white light source is investigated.