We report on blue diode-pumped single-frequency Pr:YLF lasers in orange spectral region, for the first time to the best of our knowledge. For a single-frequency σ-polarized 607 nm laser, a maximum output power up to 175 mW is achieved with a slope efficiency of about 16.6%. Linewidth of the 607 nm single-frequency laser is measured to be about 6 MHz. Single-frequency operation has also been obtained at π-polarized 604 nm laser with a maximum output power up to 91 mW and a slope efficiency of about 8.9%. The corresponding linewidth of the 604 nm laser is about 22 MHz. The two single-frequency orange lasers exhibit wavelength tuning ranges of about 0.15 nm and 0.35 nm, respectively. This work has proposed the simplest way for single-frequency laser generation in orange spectral region, which could be obtained by complicated and low-efficiency sum-frequency mixing of Nd³⁺ lasers. This work paves a practical way for various orange-related applications.

据我们所知，我们首次报道了在橙色光谱区域中由蓝光二极管泵浦的单频Pr：YLF激光器。对于单频σ极化607 nm激光器，最大输出功率可达175 mW，斜率效率约为16.6％。测得的607 nm单频激光器的线宽约为6 MHz。在π偏振604 nm激光器上也获得了单频工作，最大输出功率高达91 mW，斜率效率约为8.9％。604 nm激光的相应线宽约为22 MHz。两个单频橙色激光器的波长调谐范围分别约为0.15 nm和0.35 nm。这项工作提出了在橙色光谱范围内产生单频激光的最简单方法，^{3个以上的}激光器。这项工作为各种与橙有关的应用铺平了实用的方法。