1. Researchers from China developed a single-mode double-pulsed nanolaser using self-assembled perovskite multiple quantum wells (MQWs). 2. The study explores the mechanisms behind pulse doubling in perovskite nanowires, aiming to enhance understanding of laser dynamics and energy relaxation. 3. The findings contribute to the development of low-threshold ultrashort double-pulsed optoelectronic devices and open new research avenues in integrated photonic systems.