Šuminas Rosvaldas, Tamošauskas Gintaras, Dubietis Audrius
Opt Lett. 2018 Jan 15;43(2):235-238. doi: 10.1364/OL.43.000235.
We experimentally demonstrate virtually lossless, filamentation-free and energy-scalable more than three-fold self-compression of mid-infrared laser pulses at 2.1 μm in a birefringent medium (β-BBO crystal), which stems from favorable interplay between the second-order cascading-enhanced self-phase modulation and anomalous group velocity dispersion. By choosing an appropriate input beam diameter and intensity, the self-compression down to sub-30 fs pulse widths with gigawatt peak power is achieved without the onset of beam filamentation and associated nonlinear losses due to the multiphoton absorption, yielding the energy throughput greater than 86%.
我们通过实验证明，在双折射介质（β-BBO晶体）中，2.1μm的中红外激光脉冲可实现几乎无损、无丝状化且能量可扩展三倍以上的自压缩，这源于二阶级联增强自相位调制与反常群速度色散之间的有利相互作用。通过选择合适的输入光束直径和强度，可实现自压缩至亚30fs的脉冲宽度，峰值功率达到千兆瓦，且不会因多光子吸收而出现光束丝状化及相关非线性损耗，能量通过率大于86%。
