Fig. 1. Numbers of publications and citations in coherent beam combining of fiber lasers based on active phase control

Fig. 2. Country distributions of research units in search results

Fig. 3. Development stage in coherent beam combining of fiber lasers based on active phase control

Fig. 4. Research units and countries of top 50 literatures cited more frequently

Fig. 5. Schematic of self-organization combination of four all-fiber lasers^[13]

Fig. 6. Schematic of heterodyne interference method^[16]

Fig. 7. Schematic of SPGD method^[22]

Fig. 8. Schematic of LOCSET method^[28]

Fig. 9. Schematic of measurement method based on interference fringes^[31]

Fig. 10. Coherent beam combining structure based on re-imaging waveguide^[46]

Fig. 11. Coherent beam combining structure based on DOE^[43]

Fig. 12. Coherent beam combining structure based on BS^[49]

Fig. 13. Coherent beam combining structure based on PBS^[44]

Fig. 14. Coherent beam combining structure based on internal phase detection^[48]

Fig. 15. Schematic of coherent beam combining of 12 mJ femtosecond pulse^[64]

Fig. 16. Schematic of international coherent amplification network^[96]

Fig. 17. Concept diagrams of DE-STAR^[97]. (a) Concept diagram of orbiting DE-STAR engaged in multiple tasks; (b) evaporation of asteroid surface

Fig. 18. Concept diagrams of Breakthrough Starshot^[100].(a) Phased array of lasers will propel nanocraft towards Proxima Centauri; (b) legends and parameters

Fig. 19. Coherent beam combining system of 32 mJ femtosecond pulse^[112]

Fig. 20. Schematic of THz generation from femtosecond laser^[157]

Fig. 21. Schematic of coherent beam combining of 16-channel multicore fiber laser ^[162]

Fig. 22. Picture of laser array made by QinetiQ^[180]

Fig. 23. Picture and application scenario of DBL made by CIVAN^[181]. (a) Picture; (b) application scenario

Fig. 24. 500 W single mode green laser with 532 nm wavelength^[149]. (a) Schematic; (b) picture