Fig. 1. Illustration of the imaging process

Fig. 2. Isosurfaces of laser intensity distribution 3D phantoms and the corresponding reconstructions: (a−b) laser intensity with Gaussian distribution, kept unhanged along the propagation direction of the beam; (c−d) laser intensity with Gaussian distribution, changed along the propagation direction of the beam; (e−f) laser intensity with non-Gaussian distribution, unhanged along the propagation direction of the beam; (a), (c) and (e) are original phantoms and (b), (d) and (f) are the corresponding reconstructions

Fig. 3. Isosurfaces of laser intensity distribution 3D reconstructions under different signal-to-noise ratios and the corresponding 2D slices for the middle section: (a−b), (c−d), (e−f), (g−h) and (i−j) are corresponding to adding 2%, 4%, 6%, 8% and 10% random noise, respectively

Fig. 4. Curve of the reconstruction error corresponding to different noise levels

Fig. 5. Illustration of the experiment setup

Fig. 6. Schematic diagram of the position for different views

Fig. 7. (a) 3D reconstruction results of the laser light intensity; (b) 2D center slice of the 3D reconstruction

Fig. 8. Contrast of projection and re-projection. (a) Projections from seven views obtained experimentally；(b) projection and re-projection from a specific view (r=0.980 2)