Phys.org  December 10, 2024 Currently, the spectral coverage of solution-processed lasers extends from visible up to telecom wavelengths in the short-wave infrared. Using lead sulphide based colloidal quantum dots researchers in Spain demonstrated the optical gain in the extended SWIR from 1600 nm to 2500 nm which has many applications such as in LIDAR, biological imaging and environmental monitoring. Using the carbon quantum dots (CQDs) in distributed feedback laser cavities, lasing with emission was tuned between 2150 nm and 2500 nm is reported. Due to the increased absorption cross-section of larger CQDs, the optical gain threshold was reduced by a […]