郑州大学卢思宇团队开发出碳点单纵向模式固态红色激光器。相关研究成果于2021年9月22日发表在《德国应用化学》。

具有单纵模的小型固体激光器对于各种光子应用至关重要。

该文中，研究人员通过结合石墨氮掺杂和表面修饰制备了发光量子产率（PLQY）为65.5%的红色发射碳点（CDs）。高浓度掺杂改变了CDs从蓝色到红色的发射，而表面的给电子基团和聚合物涂层改善了PLQY和光稳定性。CDs具有良好的受激发射特性，具有较低的放大自发发射阈值和较长的增益寿命。构建了一个只有一个谐振模的与CDs的ASE峰相匹配的平面微腔。将CDs与微腔相结合，产生了具有单纵模、线宽为0.14nm、信噪比为14.8db的固体激光器。

研究结果将有助于彩色固体微/纳米激光器的发展，在实际光子学中具有潜在的应用前景。

附：英文原文

Title: Solid-state Red Laser with a Single Longitudinal Mode from Carbon Dots

Author: Yongqiang Zhang, Haoqiang Song, Lu Wang, Jingkun Yu, Boyang Wang, Yongsheng Hu, Shuang-Quan Zang, Bai Yang, Siyu Lu

Issue&Volume: 2021-09-22

Abstract: Miniaturized solid-state lasers with a single longitudinal mode are vital for various photonic applications. Here we prepare red-emissive carbon dots (CDs) with a photoluminescence quantum yield (PLQY) of 65.5% by combining graphitic nitrogen doping and surface modification. High-concentration doping alters the CDs’ emission from blue to red, while the electron-donating groups and polymer coating on their surfaces improve the PLQY and photostability. The CDs exhibit excellent stimulated emission characteristics, with a low threshold of amplified spontaneous emission (ASE) and long gain lifetime. A planar microcavity with only one resonant mode, which fitted with the CDs’ ASE peak, was constructed. Combining the CDs and microcavity produced a solid-state laser with a single longitudinal mode, a linewidth of 0.14 nm and a signal-to-noise ratio of 14.8 dB. Our results will aid the development of colorful solid-state micro/nano lasers with potential use in practical photonics.

DOI: 10.1002/anie.202111285

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202111285