Opt Lett. 2023 Jun 1;48(11):3103-3106. doi: 10.1364/OL.491781.
Nd-doped glasses are the most widely used laser gain media. However, Nd-doped non-silica microsphere lasers generally have lower quality (Q) factors due to the presence of non-radiative energy-loss impurities in traditional glass systems. In this work, we report the first, to the best of our knowledge, Nd-doped phosphate glass microsphere laser with the highest Q-factor of 1.54 × 10 among all Nd-doped non-silica glass microsphere lasers. Whispering gallery modes in the 1020-1120-nm band can be obtained for a typical microsphere with a diameter of 82.57 µm. When the pump power exceeds the threshold of 0.17 mW, single- and multi-mode microsphere lasing can be generated under 808-nm laser diode (LD) pumping. Typical Q-factors of the phosphate glass microspheres can reach 10, which is at least an order of magnitude higher than those of other Nd-doped non-silica glass microsphere lasers. The Nd-doped phosphate glass microsphere laser reported in this work can be considered as an active optical/photonic device with low pump thresholds.
掺钕玻璃是应用最广泛的激光增益介质。然而，由于传统玻璃系统中存在非辐射能量损失杂质，掺钕非硅微球激光器的品质（Q）因数通常较低。在这项工作中，我们报道了首例、据我们所知，掺钕磷酸盐玻璃微球激光器具有最高的 Q 因数为 1.54×10，这在所有掺钕非硅玻璃微球激光器中是最高的。在 1020-1120nm 波段可以获得 whispering gallery 模式，对于典型的直径为 82.57μm 的微球。当泵浦功率超过 0.17mW 的阈值时，在 808nm 激光二极管（LD）泵浦下可以产生单模和多模微球激光。磷酸盐玻璃微球的典型 Q 因数可达 10，至少比其他掺钕非硅玻璃微球激光器高一个数量级。本工作中报道的掺钕磷酸盐玻璃微球激光器可以被认为是一种具有低泵浦阈值的有源光/光子器件。
