The quasi-tunable random laser based on DCM dye-doped graphdiyne

Abstract Tunable low-coherence light sources are critical for compact photonic and sensing devices, while high-performance wavelength-tunable random lasers remain rarely reported. Here, we demonstrate a graphdiyne (GDY)-based tunable random laser using DCM dye as the gain medium and GDY as the saturable absorber. By modulating the GDY:DCM volume ratio, we achieve continuous tunable lasing with a maximum redshift of 8.4 nm and a nearly 50% reduction in linewidth. TiN nanoparticle doping further reduces the threshold to 15 μ J and enables sharp coherent lasing peaks. This work provides a facile strategy for quasi-tunable random lasers.