Fig. 1. Overall design for blue semiconductor laser 350 W module. (a) Laser diode 1~4; (b) Beam shaping system; (c) Beam expander; (d) Coupling lens; (e) Fiber

Fig. 2. Compressing the slow-axis beam. (a) Step-wise reflective mirror assembly; (b) Profile diagram of the compressed optical spot

Fig. 3. Process of spatial beam combining in the slow axis. (a) Spatial beam combining structure；(b) Physical structure；(c) Spot after double-unit beam combining；(d) Spot after three-unit beam combining；(e) Spot after four-unit beam combining

Fig. 4. Process of polarization beam combining in the fast axis. (a) Polarization beam combining structure；(b) Physical structure；(c) Spot after beam combining

Fig. 5. Process of fast-axis beam expansion. (a) Beam expansion structures；(b) Spot after beam expanded

Fig. 6. Process of focal coupling into the optical fiber. (a) Process of focal coupling；(b) Spot after focusing；(c) Spot in fiber

Fig. 7. Beam output experimental results. (a) Final beam combining system; (b) Power versus time curve