Ultralow-threshold quasi-CW lasing from FAPbBr₃perovskite first-order DFB laser

Area of Science:

• Materials Science
• Photonics
• Optoelectronics

Background:

• Metal halide perovskites are promising for integrated photonics.
• Developing efficient and low-threshold lasers is crucial for advanced optical applications.

Purpose of the Study:

• To report a quasi-continuous wave (quasi-CW) pumped ultra-low amplified spontaneous emission (ASE) and lasing threshold laser.
• To investigate the lasing properties of formamidinium lead bromide (FAPbBr3) at room temperature.

Main Methods:

• Fabrication and characterization of a formamidinium lead bromide (FAPbBr3) laser.
• Quasi-continuous wave (quasi-CW) optical pumping at room temperature.
• Analysis of amplified spontaneous emission (ASE) and lasing thresholds, and spectral properties (FWHM).
• Investigation of polymer doping effects on material performance and recombination rates.

Main Results:

• Achieved stable lasing at 555 nm with a narrow spectral width (0.6 nm FWHM).
• Demonstrated a low lasing threshold of 22.6 μJ cm⁻² under 3.5 ns quasi-CW excitation.
• Observed an ultra-low ASE threshold of 46 μJ cm⁻² under identical pumping conditions.
• Showed that polymer doping enhances performance by increasing bimolecular recombination rate via reduced grain size.

Conclusions:

• Formamidinium lead bromide (FAPbBr3) is a viable material for low-threshold lasers in integrated photonics.
• Polymer doping is an effective strategy to improve the performance of perovskite lasers.
• Reduced grain size and increased bimolecular recombination contribute to enhanced laser efficiency.