我們以兩道雷射光來驅使氫氣分子產生同調振動運動，而這樣的同調振動運動又會調變原本的雷射光頻率，產生出高階的拉曼旁頻輻射，目前觀察到的頻寬已達到70,000cm^(-1)。這些高階的拉曼輻射不但具有同調的特性，而且傳播的方向都與原本輸入的雷射方向共線。利用這樣的光源特性，再將它們的相對相位調控適宜，就可以合成出達到埃秒時間尺度的脈衝。使用了7道拉曼輻射，頻寬涵蓋25,000cm^(-1)，經由驅動雷射頻率的選擇以及適當的相位調整之後，我們已經成功地得到了電場脈衝寬度為440埃秒的脈衝序列。

We induce hydrogen molecules to undergo coherent vibrational motion with two driving lasers. This coherent motion modulates the driving laser frequency and generates high-order Raman sidebands. The spectral spread of these Raman sidebands reaches 70,000cm^(-1). By synthesizing pulses using these sidebands we can get pulse trains in the attosecond regime. Here we describe the synthesis of periodic waveforms consisting of a train of pulses that are 0.83 cycles long and have an electric field pulse width of 0.44 fs using 7 Raman sidebands generated by molecular modulation in H2.