摘要
Tunable coherent extreme ultraviolet radiation has been generated in CO by two-photon resonant third harmonic generation via the A^(1) II(v'=4)←X^(1)Σ+(v"=0)transition.The third nharmonic spectrum exhibits resolved and improved rotational lines due to the expansion cooling of the molecular beam.The saturation and the phase-matching of the nonlinear process are also discussed.
基金
Supported by the High Technology Program of Lasers(863-410)
the National Natural Science Foundation of China under Grant No.19584001.
