CsPbBr₃ Perovskite Nanocrystals for a Q-Switched Pulsed Fiber Laser in the C-Band Region

Abstract

All-inorganic perovskite nanocrystals have been widely reported as promising light-harvesting and light-emitting semiconductor nanomaterials. However, their nonlinear optical properties and laser applications have rarely been explored, especially for pulse laser modulation in the telecommunication C-band window. Herein, we experimentally demonstrated a passively Q-switched erbium-doped fiber laser (EDFL) operation at the C-band region using perovskite CsPbBr 3 nanocrystals as a saturable absorber (SA). The broadband linear optical absorption in the 300−2000 nm range and the nonlinear optical absorption at the C-band range of around 1560 nm were discovered and investigated in CsPbBr 3 nanocrystals. The CsPbBr 3 -based SA exhibited good saturable absorption performance with a modulation depth and saturation intensity equivalent to 19.1% and 10.9 MW/cm 2 , respectively. By integrating the CsPbBr 3 SA into an EDFL cavity, a passively Q-switched operation with a central wavelength of 1560 nm, a threshold pump power of 60 mW, and the shortest pulse duration of 5.96 μs was achieved. In addition, such a Q-switching operation exhibited long-term stability. Our results indicate that the CsPbBr 3 perovskite nanocrystals can serve as an efficient candidate for constructing pulsed lasers in the C-band or even longer NIR wavelength region.

Compositional engineering of ZnBr2-doped CsPbBr3 perovskite nanocrystals: insights into structure transformation, optical performance, and charge-carrier dynamics

“…Lead-halide perovskite nanocrystals (LHPNC) have been considered next-generation light-emitting semiconductors with promising applications in optoelectronics, such as photovoltaic cells, 1 photodetectors, 2 low-threshold lasers, 3 light-emitting diodes (LEDs) for solid-state lighting and display technologies, 4 anticounterfeiting, 5 sensors 6 and X-ray scintillators 7 because of their narrow PL, tunable bandgap, near unity photoluminescence quantum yield (PLQY), reduced fluorescent blinking, high defect tolerance, and efficient radiative recombination, which is achieved through the confinement of excitons in small sizes. 8 Significant advances have been made in the synthesis of LHPNCs using various techniques, which have enabled precise control of their composition, size, and shape to produce emission that spans the entire spectrum, from near-ultraviolet (UV) to near-infrared.…”