Fig. 1. Structural diagram of tapered laser

Fig. 2. 980 nm tapered laser with separated contacts ^[8]. (a) Structural diagram; (b) M² under different output powers

Fig. 3. Fundamental lateral mode intensity of the two lasers^[17]. (a) ADQW structure; (b) SQW structure

Fig. 4. Photon distribution at the end face of narrow ridge^[21]. (a) Standard tapered laser; (b) DBR tapered laser

Fig. 5. Tapered laser with high-order surface gratings (HOSGs)^[23]. (a) Structural diagram; (b) lateral far-field distribution and divergence angle under different output powers

Fig. 6. Structural diagram of "solid bow tie" laser^[24]

Fig. 7. Structural diagram of rhombus-like stripe laser

Fig. 8. Morphology and efficiency of periodic small hole etching^[27]. (a) Scanning electron microscopy (SEM) photograph; (b) P-I characteristic curve of semiconductor laser

Fig. 9. Structural diagrams of GaSb based laser with fishbone microstructure^[28]. (a) Structural diagram; (b) SEM photograph of microstructure

Fig. 10. Structural diagram of broad area laser with SCM structure^[30]

Fig. 11. Structural diagram of broad area laser with LRW structure^[31]

Fig. 12. 2D structural diagram of broad area laser with inhomogeneous waveguide

Fig. 13. Sequence of steps leading to metal in contact with the sidewalls of the QCL device^[34]

Fig. 14. Lateral and vertical beam quality factors M² of the reference structure device and the new structure device at 20 ℃ room temperature, continuous current drive conditions^[35]

Fig. 15. Structural diagram of laser package with air gap

Fig. 16. Structural diagram of laser with microthermal channel cooling structure electrodes