Osaka University researchers have developed a first-of-its-kind compact, tunable wavelength blue semiconductor laser. The laser has promising applications in sterilization and disinfection, providing significant advancements for far-ultraviolet light technology.
The novel laser relies on a custom periodically slotted structure in nitride semiconductors providing a practical and adaptable blue wavelength laser. Originally designed for Blu-ray technology, blue nitride lasers have found applications in material processing and next-generation laser displays.
Despite their promise, conventional blue lasers are not compatible with high-efficiency wavelength conversion devices which have a narrow wavelength acceptance bandwidth. Additionally, these devices require precise wavelength control and tunability, making single-wavelength lasers ideal as an excitation source. While several single-wavelength blue lasers have been developed, none achieved the necessary wavelength control.
"Our tunable-wavelength nitride semiconductor laser oscillates in the 405 nm band, but its structure can be readily adapted to the 460 nm band as well," explains first author Taisei Kusui. "Combined with our new wavelength conversion devices, this laser enables the creation of a compact, practical far-ultraviolet light source that is safe for continuous use in indoor environments, providing effective and ongoing sterilization and disinfection."