Fig. 1. Transmission process of tilting Gaussian beam passing through cat-eye optical lens

Fig. 2. Transmission process of equivalent normal incident beam passing through line misalignment cat-eye optical lens

Fig. 3. Echo spots and intensity distributions with different incident angles. (a)-(d) Echo spots when θ=0°,10°,20°,30°; (e)-(h) intensity distributions when θ=0°,10°,20°,30°

Fig. 4. Echo spots with different focal lengths when incident angle is 20° and diameter is 50 mm. (a) f=20 mm; (b) f=30 mm; (c) f=40 mm; (d) f=50 mm

Fig. 5. Echo spots with different diameters when incident angle is 20° and focal length is 50 mm. (a) D=50 mm; (b) D=60 mm; (c) D=70 mm; (d) D=80 mm

Fig. 6. Echo spots with different defocusing amounts at normal incidence. (a) δ=-0.02 mm; (b) δ=-0.01 mm; (c) δ=0 mm; (d) δ=0.01 mm; (e) δ=0.02 mm

Fig. 7. Echo spots with different defocusing amounts at incident angle of 20°. (a) δ=-0.02 mm; (b) δ=-0.01 mm; (c) δ=0 mm; (d) δ=0.01 mm; (e) δ=0.02 mm

Fig. 8. Relationship between offset and incident angle under different defocusing amounts

Fig. 9. Relationship between offset and defocusing amount at different incident angles

Fig. 10. Diagram of experimental setup

Fig. 11. Experimental spots with different defocusing amounts at normal incidence. (a) δ=-1 mm; (b) δ=-0.5 mm; (c) δ=0 mm; (d) δ=0.5 mm; (e) δ=1 mm

Fig. 12. Simulated spots with different defocusing amounts at normal incidence. (a) δ=-1 mm; (b) δ=-0.5 mm; (c) δ=0 mm; (d) δ=0.5 mm; (e) δ=1 mm

Fig. 13. Experimental spots under different incident angles. (a) θ=0°; (b) θ=2°; (c) θ=4°; (d) θ=6°; (e) θ=8°

Fig. 14. Simulated spots under different incident angles. (a) θ=0°; (b) θ=2°; (c) θ=4°; (d) θ=6°; (e) θ=8°

Fig. 15. Offset of echo at different incident angles