We experimentally demonstrated a green liquid laser at the wavelength of 570 nm, utilizing the optical gain of vitamin $B_2$ in a highly polar organic solvent, and proposed an efficient method to enhance its lasing efficiency by adding DNA-lipid complex (DNA-CTMA) in the solution. Optical properties of vitamin $B_2$ in the hexafluoro-2-propanol solvents were investigated by adding various amounts of DNA-CTMA in terms of the UV-visible absorbance, the visible emission, and the fluorescence lifetime. A Fabry–Perot cavity was built to obtain the laser oscillation at 570 nm using a pulsed pump source at the wavelength of 450 nm, 5 ns pulse duration, and 10 Hz repetition rate. By adding DNA-CTMA, both the output power and slope efficiency were enhanced along with a significant reduction of the lasing threshold pump power. The proposed scheme could open new potential for highly efficient biolasers.

中文翻译：

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通过DNA-脂质复合物增强高极性有机溶剂中维生素B ₂的激光发射效率

我们利用维生素的光学增益，通过实验证明了波长为570 nm的绿色液体激光 ${乙}_{\mathrm{2个}}$在高极性有机溶剂中，提出了一种通过在溶液中添加DNA-脂质复合物（DNA-CTMA）来提高其激光发射效率的有效方法。维生素的光学性质${乙}_{\mathrm{2个}}$在六氟-2-丙醇溶剂中，通过添加各种量的DNA-CTMA，研究了UV-可见光吸收率，可见光发射和荧光寿命。使用脉冲泵浦源构建了Fabry-Perot腔，以获取570 nm处的激光振荡，该泵浦源的波长为450 nm，5 ns脉冲持续时间和10 Hz重复频率。通过添加DNA-CTMA，输出功率和斜率效率都得到了提高，同时激射阈值泵浦功率也大大降低。拟议的计划可以为高效生物激光器打开新的潜力。