Fig. 1. Lateral microstructure wide-ridge waveguide semiconductor laser. (a) Device structure diagram; (b) SEM image of lateral microstructure wide-ridge waveguide; (c) packaged device diagram

Fig. 2. Modes distribution diagram of WR-LD

Fig. 3. Relationship between the lateral microstructures of different widths and the optical field distribution of each lateral mode. (a)--(c) Lateral microstructure width is 0 μm; (d)--(f) lateral microstructure width is 20 μm; (g)--(i) lateral microstructure width is 50 μm

Fig. 4. Mode loss graphs. (a) Relationship between the lateral microstructures of different widths and the loss of each lateral mode; (b) relationship between the lateral microstructure of different widths and the mode loss difference

Fig. 5. Near-field spot patterns. (a) WR-LD three-dimensional near-field spot pattern; (b) LMWR-LD three-dimensional near-field spot pattern; (c) two-dimensional near-field distribution pattern

Fig. 6. Schematic diagram of lateral divergence angle

Fig. 7. Device characteristic curves. (a) L-I-V characteristic curves; (b) electro-optic conversion efficiency characteristic curves