Near infrared dual wavelength micro surface particle laser

Miniaturization and integration of lasers have been a hot topic in recent years. Colloidal quantum dots (CQDS) can be used as laser gain media because of their high luminous efficiency and low threshold. Compact distributed Bragg reflector (DBR) combined with CQDs is used to construct micro laser. In this paper, CdTeSe/ZnS core-shell CQDs were prepared by aqueous synthesis. DBR was fabricated by magnetron sputtering using SiO2 and TiO2 through reasonable design of their thickness and repetition cycle number. CQDs were dropped on the surface of DBR to form a low-cost small-scale surface particle laser (SPL). The output emission of 770 nm and 824 nm dual wavelength laser is realized. The threshold is 11 mW/cm2 and the bandwidth is 1 nm. The micro integrated laser with high intensity and Narrow bandwidth near infrared emission has been completed.

Automated summary

The paper discusses the use of CQDs and DBR to construct micro lasers, successfully achieving dual-wavelength laser output with high intensity and narrow bandwidth. The study demonstrates that CdTeSe/ZnS core-shell CQDs and properly designed DBR structure can be used to fabricate small-scale surface particle lasers effectively.