摘要
In this paper it is reported for the first time that the third harmonic generated in EH32 mode of a gas-filled waveguide by fs pulses has higher generation efficiency. The new finding contrasts with the experiment in It. G. Durfee Ⅲ, S. Backus, M.M. Murnane, and H.C. Kapteyn, Opt. Left. 22 （1997） 1565]. Some possible factors, which produce the contradiction, are discussed briefly.
基金
The project supported by National Natural Science Foundation of China under Grant No. 90103025 and the Research Fund for the Doctoral Program of Higher .Education of China under Grant No. 20020027006
