Flórez Jefferson, Lundeen Jeff S, Chekhova Maria V
Opt Lett. 2020 Aug 1;45(15):4264-4267. doi: 10.1364/OL.394925.
We report the efficient generation of high-gain parametric down-conversion, including pump depletion, with pump powers as low as 100 µW (energies 0.1 µJ/pulse) and conversion efficiencies up to 33%. In our simple configuration, the pump beam is tightly focused into a bulk periodically poled lithium niobate crystal placed in free space. We also observe a change in the photon number statistics for both the pump and down-converted beams as the pump power increases to reach the depleted pump regime. The experimental results are a clear signature of the interplay between the pump and the down-converted beams in highly efficient parametric down-conversion sources.
我们报告了高效产生高增益参量下转换的情况，包括泵浦耗尽，泵浦功率低至100微瓦（能量为0.1微焦/脉冲），转换效率高达33%。在我们的简单配置中，泵浦光束被紧密聚焦到置于自由空间中的块状周期性极化铌酸锂晶体中。随着泵浦功率增加至达到泵浦耗尽状态，我们还观察到泵浦光束和下转换光束的光子数统计特性发生了变化。实验结果清晰地表明了在高效参量下转换源中泵浦光束与下转换光束之间的相互作用。
