Multi-color solid dye laser containing mixture of dye molecules.

报道了尼罗蓝和DCM分子共掺聚甲基丙烯酸甲酯(PMMA)固体染料激光器的双波长激光振荡，激光染料分子在可见光区表现出较大的增益和较宽的调谐范围。混合染料是实现多波长激光运转的一种方法。在本工作中，研究了二甲基亚甲基纤维素与尼罗蓝的混合染料，其密度分别为0.1g/L和0.1g/L。实验测得荧光寿命为6.7 ns，在DCM和尼罗蓝固体染料中的荧光寿命分别为3 ns和2.4 ns。由于尼罗蓝的吸收带与尼罗蓝的发射带有很好的重叠，DCM与尼罗蓝混合后的固体染料的寿命延长是由于从DCM到尼罗蓝的共振能量传递引起的。激光腔体为平面平行结构，由高反射率端面镜和反射率为53%的输出镜组成，反射率在600~700 nm之间。腔长1.5 cm。用脉冲宽度为10 ns、重复频率为2.5赫兹的倍频调Q激光横向泵浦DCM和尼罗蓝混合固体染料。在DCM和尼罗蓝混合固体染料的情况下，实现了604 nm和671 nm波长的双频激光运转。通过掺杂DCM，激光频率向蓝移。从DCM到尼罗蓝的有效能量传递导致了激光频率的蓝移，在604 nm和671 nm波长下，分别获得了1.6%和2.4%的实验斜率效率。获得了3mJ的实验激光阈值。相反，未掺杂DCM的尼罗蓝固体染料的实验斜率效率高达1.0%。DCM的掺杂很好地提高了激光效率。

Dual-wavelength laser oscillation in solid dye laser based on a Nile-Blue and DCM molecules co-doped poly-methyl-methacrylate (PMMA) is presented.Laser dye molecules exhibit large gain and wide tunability in the visible region. Dye-mixture is a way to achieve multi-wavelength laser operation. In this work, the dye-mixture of DCM and Nile-Blue is investigated.The densities of the DCM and Nile-Blue molecules are O.1 g/l and O.1 g/l, respectively. Experimental fluorescence lifetime of 6.7ns was measured, while fluorescence lifetimes of 3ns and 2.4ns in DCM and Nile-Blue solid-dyes were measured, respectively. The extension of the lifetime in the solid-dye with mixture of DCM and Nile-Blue is induced by resonant energy transfer from DCM to Nile-Blue, because absorption-band of the Nile-Blue overlaps well with emission-band of the DCM. Laser cavity with a plane-parallel geometry was composed of an end-mirror with high reflectivity and an output mirror with reflectivity of 53 % in the region from 600nm to 700nm. Cavity length was 1.5 cm. The solid-dye with mixture of DCM and Nile-Blue was transversely pumped by a freqnency-doubled Q-switched Nd : YAG laser with pulse duration of 10ns at repetition rate of 2.5 Hz. In the case of the solid-dye with the mixture of DCM and Nile-Blue, dual-frequency laser operation at the wavelengths of 604nm and 671nm was achieved. By the doping of DCM, the lasing frequency shifts toward the blue. Efficient energy transfer from the DCM to the Nile-Blue induces the blue-shift of the lasing frequency.Experimental slope efficiencies of 1.6 % and 2.4 % were obtained with the wavelengths of 604nm and 671nm, respectively. Experimental laser threshold of 3mJ was obtained. On contrary, experimental slope efficiency of the Nile-Blue solid-dye without the doping of the DCM was as much as 1.0 %. The doping of the DCM improves well the lasing efficiency.