Proceedings Article | 24 November 2023
Ziyuan Xie, Yuanxun Liu, Jinglin Chen, Guoyuan Liao, Shuicong Gu, Zhihao Huang, Xuliang Feng, Zelin Zhou, Yanyi Chen, Feilong Li, Yahong Li, Ruxue Li
KEYWORDS: Perovskite, Vertical cavity surface emitting lasers, Finite-difference time-domain method, Refractive index, Laser resonators, Design and modelling, Optical resonators, Cavity resonators, Reflection, Mirrors
All inorganic perovskite ABX3(X=Cl, Br, I) is widely used in the research of laser devices due to its excellent optical properties, such as high luminescence quantum yield, large gain coefficient, high carrier mobility and adjustable wavelength, etc. Compared with traditional edge-emitting lasers, vertical cavity surface emitting laser (VCSEL) has great advantages in beam quality, fiber coupling efficiency, single longitudinal mode and cavity surface reflectivity. In this experiment, all-inorganic perovskite material is used as the optical gain material, and an optical pump composed of distributed Bragg mirror (DBR) is used to construct a vertical cavity surface-emitting laser. The DBR mirror parameters (SiO2/TiO2 and SiO2/Ta2O5, respectively) and DBR layers (5, 8, 10 and 12, respectively) were simulated by Finite Difference Time Domain (FDTD) method. The results show that the reflectivity of DBR composed of SiO2/TiO2 material in 10/12 layer is closer to 99.95%, and the DBR mirror can realize the photon limitation to a greater extent and form resonance. On this basis, the vertical cavity of different cavity lengths (λ/2 and 3λ/2, respectively) were simulated. It was found that choosing a proper cavity length is able to achieve a single mode lasing of green emission in 532 nm, and its resonator quality factor (Q factor) will more than 8000. Therefore, from the results of electric field intensity of different samples, it was found that a shorter cavity gives rise to a stronger restriction on light field and photon, and a more concentrated on mode distribution. And thus, a higher Q factor will be demonstrating that is more conducive to the performance of laser device. This work also provides the theoretical analysis model and related parameters for the preparation of lasers.
