Fig. 1. Schematic of polarization pre-compensation

Fig. 2. Schematic of 1.43 kW fiber coherent beam combination experiment

Fig. 3. Far-field images of CBC. (a) Far-field image of tiled-aperture configuration; (b) far-field image of filled-aperture configuration under in-phase control; (c) far-field image of filled-aperture configuration under out-of-phase control

Fig. 4. Structural diagram of 5-channel non-polarization-maintaining CBC system

Fig. 5. Experimental layout of three-dimensional diffractive CBC system

Fig. 6. Block diagram of one channel MOPA

Fig. 7. Schematic of 1×5 DOE beam combining setup

Fig. 8. Schematic of experimental device

Fig. 9. Schematic of polarization synthesis system

Fig. 10. Schematic of two kinds of polarization end compensation schemes

Fig. 11. Schematic of three-way Raman fiber amplifier beam combiner

Fig. 12. Schematic of polarization converting system using axicon

Fig. 13. Experimental setup for testing proposed CPBC with two input beams

Fig. 14. CPBC test system with three input beams

Fig. 15. Structural diagram of CBC system

Fig. 16. Non-polarization-maintaining adaptive polarization conversion system based on SPGD algorithm

Fig. 17. Schematic of experimental active polarization control system for 1.43 kW narrow linewidth fiber amplifier based on SPGD algorithm

Fig. 18. Schematic of polarization control system

Fig. 19. CBC of five-way laser based on CDMA

Fig. 20. CBC of 16 fiber lasers based on cascading phase control