Fig. 1. Schematic diagram of (a) the PFF-SBC, (b) the conventional SBC, and (c) the LD source module. LD, laser diode; FAC, fast axis collimator; SAC, slow axis collimator; HWP, half-wave plate; CL1–CL4, cylindrical lenses; PBS, polarization beam splitter; TL, transform lens; G, transmission grating; HRM, high-reflectivity mirror; OC, output coupler.

Fig. 2. Power and ratio versus the injection current of PFF-SBC.

Fig. 3. Power versus the injection current for the free-running, PFF-SBC, and conventional SBC modes.

Fig. 4. E-O efficiency, voltage, and combining efficiency of free-running, PFF-SBC, and conventional SBC modes versus the injection current. (a) E-O efficiency and voltage; (b) combining efficiency.

Fig. 5. Measured results for the DOP versus the injection current in the free-running, PFF-SBC, and conventional SBC modes.

Fig. 6. Improvement in PFF-SBC relative to the conventional SBC. (a) Power, (b) E-O efficiency, (c) combining efficiency, and (d) DOP.

Fig. 7. Emission spectrum of the PFF-SBC at a current of 8 A.

Fig. 8. Measured results for the beam quality of the PFF-SBC at an injection current of 8 A.