飞秒激光在氦气中的高次谐波

High-Order Harmonic Generation in He Driven by Ti∶Sapphire Femtosecond Laser

利用中心波长在 795nm的线偏振的钛宝石超短脉冲激光除为抽运源 ,在氦气中观察到 40nm～ 16 0nm第 5～ 17次谐波的软X射线激光辐射 ,着重研究了高次谐波谱线强度随气压的变化规律 ,发现高次谐波谱线强度随充气气压的增加而增强 ,实验中考虑到如果充气气压过高 ,探测仪器可能受到损害 。

The 5th～7th high order harmonics soft X-ray radiation with He in static gas target ranging from 40 nm to 160 nm driven by linearly-polarized 105 femtosecond Ti∶sapphire laser at 795 nm are observed. The change of high-order harmonic intensity vs gas pressures is studied. The high-order harmonic intensity increases with gas pressures, but the optimal gas pressures have not been obtained considering the possible destruction to the detector under higher gas pressures.