Supercontinuum generation in gases: A high order nonlinear optics phenomenon

摘要: The recent development of high power, ultrashort pulse sources has created renewed interest in the interaction between intense laser radiation and free atoms molecules. Not only is it feasible to apply fields that approach, or exceed, strength atomic field as seen by outer electrons, but also possible these nonadiabatically using pulses. Until now, experiments have been restricted isolated atoms. However, because theories nonlinear optics multiphoton ionization are so interrelated, we should expect new phenomena optical signatures. In addition their intrinsic interest, can add a perspective for judging emerging intensity processes. Clearly, there class be performed ultrahigh We describe an experiment pressure gases with 2 psec 70 fsec 0.6 {mu}m focused peak I {approx lt} 10{sup 13} W/cm{sup 2}. maximum exceeds which observed longer Xe either 1.06 0.53 radiation. It approximately at tunnel ionizationmore » nanosecond 10 pulses very low Xe. Furthermore, such intensities experiments, energy electrons from Xe.« less