Zhu Zheng, Wang Yin, Zhang Wenfei, Wu Tao, Wang Xiaofei, Yang Yanmin, Wang Ting, Xu Xuhui
Opt Lett. 2022 Apr 1;47(7):1879-1882. doi: 10.1364/OL.452882.
Ultraviolet solid-state light sources, especially in the short-wave ultraviolet band, are attracting great attention for potential applications in high-density optical data storage, biomedical research, and water and air purification and sterilization. As one of the means to generate solid-state short-wavelength lasers, upconversion technology, which can transform a low-energy photon to a high-energy photon, has a simple structure and does not require strict phase-matching conditions. However, because of the high non-radiative decay rate during multiphoton absorption process, the short-wave upconversion ultraviolet lasing is still difficult to achieve. Here, under 450 nm blue laser excitation, we have successfully obtained ultraviolet C random lasing from a Pr doped YPO single crystal via two-photon absorption. Presently, ultraviolet C random lasing with the wavelength range of 230-280 nm is the shortest wavelength for upconversion lasing emission.
紫外固态光源，特别是在短波紫外波段，因其在高密度光数据存储、生物医学研究以及水和空气净化与杀菌等潜在应用中而备受关注。作为产生固态短波长激光的手段之一，上转换技术能够将低能量光子转换为高能量光子，其结构简单且无需严格的相位匹配条件。然而，由于在多光子吸收过程中存在较高的非辐射衰减率，短波上转换紫外激光仍难以实现。在此，在450 nm蓝光激光激发下，我们通过双光子吸收成功地从掺Pr的YPO单晶中获得了紫外C随机激光。目前，波长范围为230 - 280 nm的紫外C随机激光是上转换激光发射的最短波长。
