| Flat-top phase-matched high-order harmonics in gas-filled cell |
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| 作者姓名： | 谢新华 曾志男 李儒新 邓蕴沛 陆海鹤 印定军 |
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| 作者单位： | Key Laboratory for High Intensity Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for High Intensity Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for High Intensity Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for High Intensity Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for High Intensity Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for High Intensity Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，Key Laboratory for High Intensity Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 |
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| 基金项目： | The work was supported by the National Natural Science Foundation of China (No. 69925513 and 19974058) and the Chinese National Major Basic Research Project (No. G1999075204). |
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| 摘 要： | Phase-matched high-order harmonic generation in Ar gas-filled cell is investigated experimentally. We obtain phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system at 0.55 mJ/pulse energy level and 1-kHz repetition rate. Moreover, we find that the spatial distribution of intensity of high-order harmonics is flat-top profile other than a Gaussian one under the condition of optimized conversion efficiency in the static gas cell.
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