Opt Lett. 2022 Jun 15;47(12):3051-3054. doi: 10.1364/OL.459408.
High-power red lasers (mainly at 639 and 670 nm) based on Pr:YLF crystals have been presented in many works. However, the spectral resources of Pr:YLF in the red region have not been fully developed to obtain lasers due to their relatively low emission cross sections and the irrepressible strong emission at ∼639 nm. In this work, we propose a scheme to further develop the spectral resources of Pr:YLF in the red region and improve the red laser powers based on this crystal. The laser wavelengths are obtained from 634.5 to 674.7 nm (continuous tunings are achieved at some wavebands). To the best of our knowledge, the output powers obtained at 638.7, 644.6, 670.1, and 674.7 nm (2.88 W, 1.87 W, 3.55 W, and 1.73 W, respectively) are the highest to date. Furthermore, lasing originating from the P energy level of Pr:YLF (∼653 nm) is realized for the first time.
基于掺镨氟化钇锂（Pr:YLF）晶体的高功率红光激光器（主要在 639nm 和 670nm 处）在许多工作中都有报道。然而，由于其发射截面相对较低，以及在∼639nm 处不可抑制的强发射，Pr:YLF 在红光区域的光谱资源尚未得到充分开发，无法用于获得激光。在这项工作中，我们提出了一种方案，以进一步开发基于该晶体的 Pr:YLF 在红光区域的光谱资源，并提高红光激光功率。激光波长可从 634.5nm 到 674.7nm 获得（在一些波段可实现连续调谐）。据我们所知，在 638.7nm、644.6nm、670.1nm 和 674.7nm 处获得的输出功率（分别为 2.88W、1.87W、3.55W 和 1.73W）是迄今为止最高的。此外，首次实现了来自 Pr:YLF 的 P 能级（∼653nm）的激光。
