Fabrication process. (a) Formation of p-electrodes and etching masks. (b) Formation of active and slotted channels. (c) SEM image of slotted channel. (d) Deposition of insulator layer and photoresist opening. (e) Insulator layer opening. (f) Metallization and facet coating. Credit: Applied Physics Express (2024). In a new study, researchers at Osaka University have created the world's first compact, tunable-wavelength blue semiconductor laser, a significant advancement for far-ultraviolet light technology with promising applications in sterilization and disinfection. ...