van Tilborg J, Daniels J, Gonsalves A J, Schroeder C B, Esarey E, Leemans W P
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA and Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jun;89(6):063103. doi: 10.1103/PhysRevE.89.063103. Epub 2014 Jun 19.
Electrically discharged plasma channels can guide laser pulses, extending the laser-plasma interaction length to many Rayleigh ranges. In applications such as the laser-plasma accelerator, the laser group velocity in the channel plays a critical role. The laser travel time (and thus the averaged group velocity) was measured through two-pulse frequency-domain interferometry and was found to depend on the on-axis plasma density and laser spot size. The data is in agreement with theory.
放电等离子体通道可以引导激光脉冲，将激光-等离子体相互作用长度扩展到多个瑞利长度范围。在激光-等离子体加速器等应用中，通道内的激光群速度起着关键作用。通过双脉冲频域干涉测量法测量了激光传播时间（进而得到平均群速度），发现其取决于轴上等离子体密度和激光光斑尺寸。数据与理论相符。
