Quasi-phase-matching high harmonic generation using trains of pulses produced using an array of birefringent plates.
Quasi-phase-matching high harmonic generation using trains of pulses produced using an array of birefringent plates.
复制标题
使用双折射板阵列产生的脉冲串来产生准相位匹配高次谐波。
作者：
K. O’Keeffe;T. Robinson;S. Hooker
探索了利用高达8个反向传播脉冲串的准相位匹配高次谐波产生。对于最多4个脉冲的序列，测量的谐波信号增强与脉冲数量N成比例，如预期的那样为(N+1)？然而，对于N>；4的列车，没有观察到谐波信号的进一步增强。这种效应归因于产生介质内相干长度LC的变化。讨论了克服LC变化的技术。研究了准相位匹配的压力依赖关系，观察到了从真相位匹配到准相位匹配的转换。
Quasi-phase-matched high harmonic generation using trains of up to 8 counter-propagating pulses is explored. For trains of up to 4 pulses the measured enhancement of the harmonic signal scales with the number of pulses N as (N + 1)², as expected. However, for trains with N > 4, no further enhancement of the harmonic signal is observed. This effect is ascribed to changes of the coherence length Lc within the generating medium. Techniques for overcoming the variation of Lc are discussed. The pressure dependence of quasi-phase-matching is investigated and the switch from true-phase-matching to quasi-phase-matching is observed.