Amplified spontaneous emission from inclusions containing cesium lead bromide in glasses

Cesium lead halide (CsPbX3, X = Cl, Br and I) perovskite nanocrystals embedded glasses exhibit good optical properties and have potential as gain media. However, origins of the amplified spontaneous emission (ASE) from CsPbX3 nanocrystals are controversial. Here, it is found that ASE is from CsPbX3 nanocrystals in inclusions instead of CsPbX3 nanocrystals dispersed in the glass matrix. Inclusions with various sizes are capable of generating ASE, and ASE of the inclusions can sustain at energy densities as high as several tens of mJ/cm2. Thresholds of the fs laser energy densities increase with the increase in fs laser wavelength, and high net optical gain coefficient is obtained.& COPY; 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

Cesium lead halide (CsPbX3) perovskite nanocrystals embedded glasses are promising gain media with good optical properties. The amplified spontaneous emission (ASE) is found to originate from inclusions of CsPbX3 nanocrystals in the glass, rather than the dispersed nanocrystals in the matrix. Inclusions of various sizes can generate ASE, and sustain at high energy densities. The threshold of fs laser energy densities increases with longer wavelengths, and high net optical gain coefficient is achieved.