Author Affiliations
1Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Tech-nology, Beijing, 100081, China2Beijing Key Laboratory of Advanced Optical Remote Sensing Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, Chinashow less
Fig. 1. Sketch of the design geometry.
Fig. 2. The rectangular (u, v) grid (a) is transformed into a circular (u', v') grid (b) which is used as the stereographic coordinates (c).
Fig. 3. The flow diagram of the new IWT procedure for a curved target.
Fig. 4. The desired curved target. The side length of the target is 240 mm and the z values range from 73.80 mm to 132.42 mm.
Fig. 5. (a) The (u′, v′) grid corresponding to a uniform (u, v) grid on Ω={(u, v)|-0.94≤u≤0.94, -0.94≤v≤0.94} and (b) the final target grid for the first design (only showing 64×64 grid points for better visualization); (c) The final 3D freeform lens model and (d) its simulation results for a point like source (size: 10-3 mm×10-3 mm). (The unit of the irradiance: W/mm2)
Fig. 6. (a) The (u′, v′) grid corresponding to a uniform (u, v) grid on Ω={(u, v)|-0.8≤u≤0.8, -0.8≤v≤0.8} and (b) the final target grid for the second design (only showing 64×64 grid points for better visualization); (c) The final 3D freeform lens model and (d) its simulation results for a point like source (size: 10-3 mm×10-3 mm). (The unit of the irradiance: W/mm2)
Fig. 7. Simulated irradiance distributions for the first lens design when the source size is changed into (a) 1 mm× 1mm and (b) 2 mm× 2 mm respectively; simulated irradiance distributions for the second lens design when the source size is changed into (c) 1 mm × 1mm and (d) 2 mm × 2 mm respectively.
(The unit of the irradiance: W/mm2; the unit of the length: mm)
Fig. 8. Simulated irradiance distributions for the first lens design when the source-lens system is (a) 5 mm and (b) 10 mm closer to the target. Simulated irradiance distributions for the second lens design when the source-lens system is (c) 5 mm and (d) 10 mm closer to the target.
(The unit of the irradiance: W/mm2; the unit of the length: mm)