Fig. 1. Schematic diagram of beam quality short-range measurement at the laser system export

Fig. 2. (a) Far-field light spots under weak turbulence; (b) Far-field light spots under moderate turbulence; (c) Far-field light spots under strong turbulence

Fig. 3. (a) \begin{document}$ C_n^2 $\end{document} influence curve on \begin{document}$ \beta $\end{document} factors; (b) \begin{document}$ \beta $\end{document} factors under different \begin{document}$ C_n^2 $\end{document}

Fig. 4. (a) Influence curves of transverse wind speed on \begin{document}$ \beta $\end{document} factor; (b) Influence curves of relative air humidity on \begin{document}$ \beta $\end{document} factor

Fig. 5. (a) Influence curves of beam diameter on \begin{document}$ \beta $\end{document} factor; (b) Influence curves of outgoing light power on \begin{document}$ \beta $\end{document} factor

Fig. 6. The impact curve of \begin{document}$ C_n^2 $\end{document} on \begin{document}$ \beta $\end{document} factor under different initial \begin{document}$ \beta $\end{document} factors

Fig. 7. Influence curves of \begin{document}$ C_n^2 $\end{document} on \begin{document}$ \beta $\end{document} factors at different transmission distances

Fig. 8. 700 mm parallel light tube

Fig. 9. (a) Light spot of weak turbulence far field in 700 mm parallel light tube; (b) Light spot of moderate turbulence far field in 700 mm parallel light tube

Fig. 10. Indoor changes of \begin{document}$ C_n^2 $\end{document} in different time periods