Yi Jiayu, Yu Yi, Shang Jianli, An Xiangchao, Tu Bo, Feng Guoying, Zhou Shouhuan
Opt Express. 2016 Mar 7;24(5):5102-5109. doi: 10.1364/OE.24.005102.
A waveguide scheme is constructed by coating the matrix of randomly distributed ZnSe nanosheet structures with a layer of dye-doped polymer, which provides strong feedback or gain channels for the emission from the dye molecules and enables successful running of a random laser with FWHM of ~0.65 nm. The strong scattering by the nanostructures and the strong confinement provided by the active waveguide layer are the key essentials for the narrow-band and low-threshold operation of this random laser. The random laser scheme reveals an obvious two-threshold behavior, which is corresponding to the thresholds of TM and TE modes. The feedback mechanisms for laser action are investigated by power Fourier transforming of the spectra. This kind of active waveguide not only provides high quality confinement of the radiation for efficient amplification, but also enables possible directional output of this kind of random laser.
通过用一层染料掺杂聚合物包覆随机分布的ZnSe纳米片结构基质来构建一种波导方案，该聚合物为染料分子的发射提供了强反馈或增益通道，并使半高宽约为0.65 nm的随机激光器成功运行。纳米结构的强散射和有源波导层提供的强限制是这种随机激光器窄带和低阈值运行的关键要素。该随机激光方案呈现出明显的双阈值行为，这与TM和TE模式的阈值相对应。通过对光谱进行功率傅里叶变换来研究激光作用的反馈机制。这种有源波导不仅为高效放大提供了高质量的辐射限制，还使这种随机激光器有可能实现定向输出。
