State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Opt Lett. 2010 Jan 1;35(1):49-51. doi: 10.1364/OL.35.000049.
We demonstrate controllable generation of a high-energy supercontinuum pulse of 1.8 mJ through femtosecond filamentation in prealigned diatomic molecules in air. For high-energy femtosecond laser pulses of linear polarization, the focusing condition is loosened by the cross-defocusing effect from the perpendicularly orientated molecules, which promotes the high-energy supercontinuum generation with suppressed multifilamentation and decreased multiphoton ionization loss due to the reduced ionization probability.
我们通过在空气中预先排列的双原子分子中进行飞秒细丝化，演示了一种可控制的高能超连续脉冲的产生，该脉冲的能量为 1.8 毫焦。对于线性偏振的高能飞秒激光脉冲，由于分子的垂直定向产生的交叉散焦效应，聚焦条件得到了放宽，这促进了高能超连续脉冲的产生，并由于降低了电离概率而抑制了多细丝化和减少了多光子电离损失。
