A tunable Pr³⁺:LiYF₄ laser using a single birefringent filter (BF) plate under excitation with a frequency doubled optically pumped semiconductor laser was demonstrated to operate at nine different laser wavelengths of 523, 546, 604, 613, 639, 645, 670, 698, and 720 nm. Within these wavelengths, several new wavelengths of 613, 639, 645, and 670 nm were obtained. The total tuning range exceeded 190 nm in the visible spectral range on nine intervals between 523 nm and 720 nm. The highest output power of 2.32 W was achieved at an emission wavelength of 523 nm with a slope efficiency of 61.5% and an optical-to-optical efficiency of 52.1% with respect to the absorbed pump power. Moreover, by adjusting the rotation angle of the BF plate, a continuous-wave simultaneous dual-wavelength Pr³⁺:LiYF₄ laser operating at 698 and 720 nm was also demonstrated. At an absorbed pump power of 4.45 W, the maximum output powers at 698 nm and 720 nm were 162 mW and 258 mW, respectively.

中文翻译：

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绿红光谱范围内的可调Pr3 +：LiYF4激光器

使用单个双折射滤光片（BF）板在倍频光泵浦半导体激光器的激发下，可调谐Pr ³⁺：LiYF ₄激光器在523、546、604、613、639、645的九种不同波长下工作670、698和720 nm。在这些波长内，获得了613、639、645和670 nm的几个新波长。在523 nm和720 nm之间的九个间隔处，总调谐范围在可见光谱范围内超过190 nm。相对于吸收的泵浦功率，在523 nm的发射波长下获得了最高的2.32 W输出功率，其斜率效率为61.5％，光光效率为52.1％。此外，通过调节高炉板的旋转角度，可以得到连续波同时双波长Pr还展示了在698和720 nm下工作的³⁺：LiYF ₄激光器。在4.45 W的吸收泵浦功率下，在698 nm和720 nm处的最大输出功率分别为162 mW和258 mW。