Li Zhuang, Liao Wenlu, Zhang Zheng, Xu Huiying, Cai Zhiping
Opt Lett. 2024 Apr 1;49(7):1660-1663. doi: 10.1364/OL.517858.
We report a high-performance wavelength-switchable near-infrared Pr:LiYF (Pr:YLF) laser by InGaN laser diode (LD) pumping. The 895, 922, and 924 nm lasers with low emission cross sections in the Pr:YLF crystal have been successfully realized using a birefringent filter Lyot as well as designing and optimizing optical thin films and the laser resonant cavity. The maximum output powers of the 895, 922, and 924 nm lasers are 2.01, 1.92, and 1.95 W, respectively. As far as we know, these are the highest power for Pr:YLF lasers at 895, 922, and 924 nm so far. The beam quality 2 and 2 factors are measured to be 1.85 and 1.71 at 895 nm, 1.94 and 1.67 at 922 nm, and 1.76 and 1.60 at 924 nm, respectively. The laser output power fluctuates within ±3%. In addition, the transmittance of the Lyot is theoretically calculated to achieve laser wavelength switching. The successful realization of the wavelength-switchable watt-level continuous wave near-infrared Pr:YLF laser can provide many practical applications in biomedicine and other fields.
我们报道了一种通过氮化铟镓激光二极管（LD）泵浦实现的高性能波长可切换近红外掺镨钇锂氟化物（Pr:LiYF，Pr:YLF）激光器。利用双折射滤光片利奥滤光器以及设计和优化光学薄膜与激光谐振腔，已成功在Pr:YLF晶体中实现了发射截面较低的895、922和924 nm激光器。895、922和924 nm激光器的最大输出功率分别为2.01、1.92和1.95 W。据我们所知，这些是迄今为止Pr:YLF激光器在895、922和924 nm处的最高功率。在895 nm处测得的光束质量M²和β因子分别为1.85和1.71，在922 nm处为1.94和1.67，在924 nm处为1.76和1.60。激光输出功率在±3%范围内波动。此外，从理论上计算了利奥滤光器的透过率以实现激光波长切换。波长可切换瓦级连续波近红外Pr:YLF激光器的成功实现可为生物医学等领域提供许多实际应用。
