High‐<i>Q</i>, Low‐Threshold Monolithic Perovskite Thin‐Film Vertical‐Cavity Lasers

Abstract

A vertical-cavity surface-emitting perovskite laser is achieved using a microcavity configuration where CH₃ NH₃ PbI₃ thin solid films are embedded within a custom GaN-based high-quality (Q-factor) resonator. This single-mode perovskite laser reaches a low threshold (≈7.6 µJ cm^-2 ) at room temperature and emits spatially coherent Gaussian laser beams. The devices allow direct access to the study of perovskite gain dynamics and material robustness.