利用中心波长在780nm线偏振的掺钛蓝宝石超短脉冲激光,在氪气中观察到40nm～110nm第7～19次谐波的软X射线激光辐射,把中心波长调至795nm时再次观察到相同的现象,特别是观察到谱线的移动,证实观察到的谱线是高次谐波,实验中还观察了谱线强度随气压的变化规律。

Soft X ray laser radiation ranged from 40 nm to 110 nm is obtained by the 7th to the 19th order harmonic generation in krypton with femtosecond Ti∶sapphire laser operating at 780 nm, and the same phenomena especially the spectral shift is observed after the central wavelength of Ti∶sapphire laser is tuned to 795 nm. So the high order harmonic generation is confirmed. The spectrum change pumped by linear polarization laser and the spectrum intensity change with gas pressure are also observed.