Fig. 1. Divergence angle of fast axis after collimation

Fig. 2. Divergence angle of slow axis after collimation (insert is the output profile after collimation)

Fig. 3. (a) Diagram of prism for compressing width of fast axis beam; (b) filling dark space of fast axis by total reflection of prism

Fig. 4. Further filling dark space of fast axis with parallel plates

Fig. 5. Incision rotation rearrangement through twice total reflection

Fig. 6. Processes of compression of beam width in fast axis and focusing coupling

Fig. 7. Output beam spot of fiber end face