Journal of Infrared and Millimeter Waves, Volume. 42, Issue 6, 779(2023)
Enhanced terahertz wave generation in air-plasma induced by femtosecond three-color harmonic pulses
Figures & Tables(11)
Fig. 1. The THz electric field peak-peak amplitude of three-color harmonic pulse schemes with the frequency ratio of 1：2：m （3≤m≤20），when m=2，it indicates the two-color pulse case at the frequency ratio of 1：2，red dot lines connecting data （blue） are used to guide vision only and do not mean anything
Fig. 2. The time-domain waveform of THz waves generated from three-color harmonic pulse schemes at different frequency ratios and the pulse scheme containing the perfect sawtooth electric field，respectively
Fig. 3. （a） The pulse envelope composed by three-color harmonic pulses at different frequency ratios, and the pulse envelope containing the perfect sawtooth electric field, respectively, （b） the electric field structure in the time range of -6 fs to 6 fs in the composed pulse envelope, the black dashed line is the grid line
Fig. 4. In the time range of -21 fs to -10 fs, the electric field structure, electron drift velocity, and ionization rate corresponding to the pulse composed by three-color harmonic pulses at different frequency ratios and the pulse containing the perfect sawtooth electric field, （a） 1:2:3, （b） 1:2:4, （c） 1:2:5, （d） 1:2:8, （e） 1:2:10, （f） the perfect sawtooth electric field, respectively
Fig. 5. The time-varying electron density of three-color harmonic pulse schemes at different frequency ratios and the pulse scheme containing the perfect sawtooth electric field，respectively
Fig. 6. The time-varying current density of three-color harmonic pulse schemes at different frequency ratios，and the pulse scheme containing the perfect sawtooth electric field，respectively
Fig. 7. The time-domain waveform of THz waves generated by different wavelength combination schemes
Fig. 8. （a） The pulse envelope composed of different wavelength combinations at the frequency ratio of 1:2:4, respectively, （b） the electric field structure in the time range of -10 fs to 10 fs in the composed pulse envelope
Fig. 9. The dependence of the THz electric field peak-peak amplitude on the parameters of the highest harmonic at frequency ratios of 1:2, 1:2:3 and 1:2:4, including （a） the relative phases, （b） the amplitude ratio, （c） the pulse duration, respectively, the circle dots in （b） correspond to the electric field amplitude ratio of the highest harmonic for three-color pulses in Eq. （1）
Table 1. The time interval between the electric field peak of the composed pulse and the adjacent velocity peak
View tableView in ArticleTable 1. The time interval between the electric field peak of the composed pulse and the adjacent velocity peak
Frequency ratio 1：2：3 1：2：4 1：2：5 1：2：8 1：2：10 sawtooth Time interval （fs） 0.67 0.59 1.19 0.85 0.72 0
Table 2. The detailed parameters of THz waves generated by different wavelength combination schemes
View tableView in ArticleTable 2. The detailed parameters of THz waves generated by different wavelength combination schemes
Frequency ratio Wavelength combination （nm） THz peak-peak electric field amplitude （arb. units） Approximate THz amplitude ratio for 800+400 nm combination 1：2 800+400 1.939 5 1 1：2：3 800+400+267 3.055 2 1.57 1：2：3 2 400+1 200+800 9.117 9 4.70 1：2：4 800+400+200 2.900 7 1.50 1：2：4 1 600+800+400 5.742 6 2.96 1：2：4 3 200+1600+800 11.970 9 6.17 2：3：4 800+533+400 1.383 3 0.71 2：3：4 1 200+800+600 1.909 9 0.98
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Han-Qi WANG, Wen-Hui FAN, Xu CHEN, Hui YAN. Enhanced terahertz wave generation in air-plasma induced by femtosecond three-color harmonic pulses[J]. Journal of Infrared and Millimeter Waves, 2023, 42(6): 779
Paper Information
Category: Research Articles
Received: Feb. 20, 2023
Accepted: --
Published Online: Dec. 26, 2023
The Author Email: Wen-Hui FAN (fanwh@opt.ac.cn)
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