Abstract
We have experimentally investigated the gas cell pressure effect of high-order harmonic generation in argon and neon. The selective enhancement of high-order harmonic intensity in the energy range of 60–70 eV in the spectrum has been obtained in argon. The experimental results are simulated theoretically, and the main characterizations of the experimental observations are reproduced. By studying the ionization term effect in the simulation, we conclude that it is the plasma effect improves the phase-matching condition for this specific spectrum range and finally brings the enhancement.
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Acknowledgments
The authors appreciate the fruitful discussion with Jin Chen, Bingbing Wang, Peng Ye, and Shiyang Zhong. This work was partly supported by the National Key Basic Research Program of China (Nos. 2013CB922401 and 2013CB922402), National Key Scientific Instrument and Equipment Development Projects (No. 1012YQ12004704), National Natural Science Foundation of China (Nos. 11374356 and 91126008), and the International Joint Research Program of National Natural Science Foundation of China (No. 61210017).
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Wang, LF., He, XK., Teng, H. et al. Optimization of few-cycle laser pulse pumped high-order harmonic generation at 60–70 eV by changing the gas pressure. Appl. Phys. B 121, 81–85 (2015). https://doi.org/10.1007/s00340-015-6203-0
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DOI: https://doi.org/10.1007/s00340-015-6203-0