Fig. 1. (a) Gaussian optics of collimator lens; (b) Gaussian optics of imaging lens

Fig. 2. (a) Design results of 500 m image distance; (b) Focusing effect from different fields at 500 m

Fig. 3. (a) Wavefront aberration of wavelength 808 nm; (b) Wavefront aberration of wavelength 632.8 nm

Fig. 4. Optical fiber end face movement at different focusing distances

Fig. 5. Comparison of wavefront aberration of two design methods after focusing

Fig. 6. (a) Spot at 200 m with fiber core of 600 μm×600 μm; (b) Spot at 1 km with fiber core of 200 μm×200 μm

Fig. 7. (a) Unfocused spot at 200 m; (b) Unfocused spot at 300 m; (c) Focused spot at 200 m; (d) Focused spot at 300 m

Fig. 8. Three-dimensional model of laser emission optical system

Fig. 9. (a) Developed laser emission optical system; (b) Installed on rotational platform

Fig. 10. Test result of wavefront aberration RMS