Kobtsev Sergey, Ivanenko Aleksey, Kokhanovskiy Alexey, Gervaziev Mikhail
Opt Express. 2018 Nov 12;26(23):29867-29872. doi: 10.1364/OE.26.029867.
This work presents implementation of a new approach to single-cascade Raman conversion of laser pulses from the spectral range around 1.1 µm into the 1.3-µm wavelength region. The proposed conversion technique relies on double-scale pico-femtosecond pulses for synchronous pumping of an external cavity made of phosphosilicate fiber with high-precision adjustment of pulse repetition rate to the inter-mode frequency of the external cavity. This enabled generation of double-scale pulses centered at 1270 nm featuring a record energy of 63 nJ and the pulse envelope duration of 88-180 ps with the sub-pulse duration of 200 fs. The fraction of the radiation that was converted into the 1270 nm range amounted to 47 percent of the total Raman-converted radiation power. The generated results offer promising possibilities for new spectral ranges to be developed in the field of high-energy pulsed sources with unique double-scale temporal structure.
这项工作展示了一种将波长在1.1 µm左右的激光脉冲单级联拉曼转换到1.3 µm波长区域的新方法的实现。所提出的转换技术依赖于双尺度皮秒-飞秒脉冲，用于同步泵浦由磷硅酸盐光纤制成的外腔，并将脉冲重复率高精度调整到外腔的模间频率。这使得能够产生中心波长为1270 nm的双尺度脉冲，其能量达到创纪录的63 nJ，脉冲包络持续时间为88 - 180 ps，子脉冲持续时间为200 fs。转换到1270 nm范围的辐射占拉曼转换总辐射功率的47%。所产生的结果为在具有独特双尺度时间结构的高能脉冲源领域开发新的光谱范围提供了有前景的可能性。
