Two‐Photon Pumped Single‐Mode Lasing in CsPbBr₃ Perovskite Microwire

Abstract

Achieving high‐quality, frequency‐upconversion single‐mode lasing output is an important requirement for developing new nonlinear optoelectronic devices, such as on‐chip optical communication, nonlinear optical switches, and optical parametric amplifiers. Here, an individual CsPbBr3 microwire prepared by the anti‐solvent method is served as both gain media and microresonator to achieve two‐photon pumped frequency upconversion single‐mode lasing with the side‐mode suppression ratio of 18 dB. Meanwhile, the refractive index of orthorhombic perovskite is theoretically calculated based on first principles, and determining its square whispering‐gallery oscillation type by combining with the plane wave model and the steady‐state oscillation conditions of laser. The extracted exciton binding energy of 33.15 meV higher than the thermal ionization energy of room temperature (≈26 meV) suggests that the as‐grown CsPbBr3 microwires possess the capacity to achieve two‐photon pumped lasing output, as well further gaining deeper insights into the role of exciton‐phonon coupling in light emission.

High Q-Factor Single-Mode Lasing in Inorganic Perovskite Microcavities with Microfocusing Field Confinement

“…Both high-quality microstructures and gain materials are indispensable in realizing high Q factor linearly and nonlinearly pumped optical microlasers. Inorganic monocrystalline perovskite semiconductors possess exceptional optical and optoelectronic properties involving high optical absorption and gain, extended carrier lifetime, long charge-diffusion length, and broad emission wavelength tunability. , The feasibility of microfabrication on monocrystalline perovskite thin film also makes it an ideal candidate material for arbitrary-shape linear and nonlinear photonic microlasers, − including perovskite microwires and polygonal microplates with FP and WGM lasing. , Meanwhile, more complex low-dimensional microstructures have been further created in perovskite systems to raise Q and F p such as microspheres, distributed-feedback gratings, and PC. While the sizes of fabricated perovskite microcavities can be reduced on the order of several micrometers, rough etched edge and diffraction and random scattering result in photon losses and slightly smaller Q -factors. , To address the above issue, combining the all-inorganic monocrystalline perovskites with nondamage pressing microlens technology, the so-called zero-dimensional (0D) perovskite microcavity could effectively confine and modulate the intracavity light field to realize high- Q and single-mode linear and nonlinear photonic lasing.…”