Fig. 1. (a) Model and ray tracing of fluorescent material; (b) ray tracing of fluorescent material after adding shading cylinder; (c) distribution of fluorescence power

Fig. 2. (a) Model of parabolic mirror and fluorescent material; (b) collimating effect of parabolic mirror on large divergence angle rays

Fig. 3. (a) Model of Fresnel lens and fluorescent material; (b) collimation effect of Fresnel lens on small divergence angle rays; (c) collimation effect of Fresnel lens and parabolic mirror on rays

Fig. 4. (a) Model of telescopic system; (b) beam contracted by telescopic system

Fig. 5. (a) Model of microlens array; (b) focus effect of microlens array

Fig. 6. Distributions of fluorescence power focused by (a) microlens array and (b) ordinary lens