基于氢气填充空芯光子晶体光纤的全光纤型气体拉曼光源特性

理论和实验研究了调Q光纤激光脉冲抽运基于氢气填充空芯光子晶体光纤气体腔的全光纤型气体拉曼光源的特性。抽运光脉冲波长为1064.7nm时,产生的Stokes频移光波长为1135.7nm。理论和实验结果均表明,产生的Stokes频移光脉冲宽度远小于抽运光脉冲,并且,Stokes频移光脉冲宽度随抽运光脉冲能量的提升而增加。此外,减小抽运光脉冲宽度,可以降低拉曼阈值抽运能量、提高Stokes频移光的转换效率。在重复频率为5kHz、脉冲宽度为125ns的调Q光纤激光脉冲抽运下,实验测得拉曼阈值抽运能量和拉曼阈值点处转换效率分别为2.13μJ和9.82%。

Characteristics of All-Fiber Gas Raman Light Source Based on Hydrogen-Filled Hollow-Core Photonic Crystal Fiber

The characteristics of all-fiber gas Raman light source based on hydrogen-filled hollow-core photonic crystal fiber pumped with Q-switched fiber laser are investigated theoretically and experimentally. The wavelength of the Stokes frequency-shift wave is 1135.7 nm with the Q-switched pump pulses at 1064.7 nm. Both our theoretical and experimental results show that the generated Stokes pulse is much narrower than the pump pulse, and the generated Stokes pulse duration increases with the single pulse energy of the pump pulses. Moreover, by choosing narrower pump pulses, the Raman threshold pump energy may decrease and the conversion efficiency may increase. For the 125 ns pump pulses with the repetition rate of 5 kHz, the Raman threshold pump energy and the conversion efficiency at the Raman threshold are measured to be 2.13 μJ and 9.82% in experiments.