Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields

Guihua Li; Hongqiang Xie; Ziting Li; Jinping Yao; Wei Chu; Ya Cheng

doi:doi:10.1017/hpl.2017.26

High Power Laser Science and Engineering, 2017, 5 (4): 04000e26, Published Online: Nov. 21, 2018

Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields Download： 581次

Guihua Li ¹Hongqiang Xie ²Ziting Li ^3,4Jinping Yao ³Wei Chu ³Ya Cheng ^3,†

Author Affiliations

¹ School of Science, East China Jiatong University, Nanchang 330013, China

² School of Science, East China University of Technology, Nanchang 330013, China

³ State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

⁴ School of Physics Science and Engineering, Tongji University, Shanghai 200092, China

Figures & Tables

Fig. 1. Schematic diagram of the experimental setup. TS: telescope system.

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Fig. 2. Typical spectra of (a) 3rd harmonic and (b) 7th harmonic; (c) measured 7th harmonic signal as a function of pump–probe time delay; (d) measured beam profiles of 3rd harmonic (red squares) and 7th harmonic (black circles).

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Fig. 3. (a) Measured 7th (black circles) and 3rd (red squares) harmonic signals from excited argon atoms as a function of the probe pulse energy; (b) measured 7th and 3rd harmonic signals from unexcited argon atoms as a function of the probe laser energy. The green dashed and blue dotted curves are the corresponding fitting curves with function $I^{q}$, where $q$ is the harmonic order. Inserts: measured harmonic signals as a function of the probe laser energies with logarithmic scales.

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Fig. 4. Measured dependences of 7th (black circles) and 3rd (red squares) harmonic signals from excited argon atoms on the elliptical polarization of the probe pulse. The green solid and blue dotted curves represent the theoretical predictions.

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Fig. 5. The physical picture of the 3rd and the 7th harmonic generation from the excited argon atoms.

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Guihua Li, Hongqiang Xie, Ziting Li, Jinping Yao, Wei Chu, Ya Cheng. Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields[J]. High Power Laser Science and Engineering, 2017, 5(4): 04000e26.

Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields Download： 581次

Fig. 1. Schematic diagram of the experimental setup. TS: telescope system.

Fig. 2. Typical spectra of (a) 3rd harmonic and (b) 7th harmonic; (c) measured 7th harmonic signal as a function of pump–probe time delay; (d) measured beam profiles of 3rd harmonic (red squares) and 7th harmonic (black circles).

Fig. 4. Measured dependences of 7th (black circles) and 3rd (red squares) harmonic signals from excited argon atoms on the elliptical polarization of the probe pulse. The green solid and blue dotted curves represent the theoretical predictions.

Fig. 5. The physical picture of the 3rd and the 7th harmonic generation from the excited argon atoms.

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Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields Download： 581次

Fig. 1. Schematic diagram of the experimental setup. TS: telescope system.

Fig. 2. Typical spectra of (a) 3rd harmonic and (b) 7th harmonic; (c) measured 7th harmonic signal as a function of pump–probe time delay; (d) measured beam profiles of 3rd harmonic (red squares) and 7th harmonic (black circles).

Fig. 4. Measured dependences of 7th (black circles) and 3rd (red squares) harmonic signals from excited argon atoms on the elliptical polarization of the probe pulse. The green solid and blue dotted curves represent the theoretical predictions.

Fig. 5. The physical picture of the 3rd and the 7th harmonic generation from the excited argon atoms.

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