Optimization of Two-color Chirped Laser Waveform for Extending High-order Harmonic Cut-off Energy and Generating Isolated Attosecond Pulse （Invited）

Chen-hui XU; Yan-bo CHEN; Li-wei HE; Cheng JIN

doi:10.3788/gzxb20204911.1149007

Journals >Acta Photonica Sinica >Volume 49 >Issue 11 >Page 106 > Article

Acta Photonica Sinica
Vol. 49, Issue 11, 106 (2020)

Optimization of Two-color Chirped Laser Waveform for Extending High-order Harmonic Cut-off Energy and Generating Isolated Attosecond Pulse （Invited）

Chen-hui XU, Yan-bo CHEN, Li-wei HE, and Cheng JIN

Author Affiliations

Department of Applied Physics， Nanjing University of Science and Technology， Nanjing210094， China

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DOI: 10.3788/gzxb20204911.1149007 Cite this Article

Chen-hui XU, Yan-bo CHEN, Li-wei HE, Cheng JIN. Optimization of Two-color Chirped Laser Waveform for Extending High-order Harmonic Cut-off Energy and Generating Isolated Attosecond Pulse （Invited）[J]. Acta Photonica Sinica, 2020, 49(11): 106 Copy Citation Text

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Fig. 1. Optimized two-color chirped laser pulse (the blue areas indicate the “temporal gate” for the generation of IAPs)

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Fig. 2. High-harmonic spectra and isolated attosecond pulses of a Ne atom under the two-color optimized waveform with duration of 16 fs

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Fig. 3. HHG spectra and isolated attosecond pulses of a Ne atom under the two-color optimized waveforms with durations of 24 fs and 32 fs, respectively

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Fig. 4. Comparison of high harmonics by using the two-color optimized laser waveforms without or with the chirp, whose initial duration is 24 fs

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Fig. 5. Comparison of single-atom harmonic spectra by using optimized waveforms with different wavelength combinations

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Run index	$E_{1} / (\times 10^{14} W / c m^{2})$	$α_{1} / (\times 10^{2} a . u .)$	$β_{1} / (\times 10^{2} a . u .)$	$β_{2} / (\times 10^{2} a . u .)$
1	1.50	1.00	-2.71	-1.80
2	1.49	0.99	-2.25	-1.60
3	1.50	0.99	-2.30	-1.98
4	1.46	1.25	-2.60	-1.71
5	1.58	1.03	-2.39	-1.92

Table 1. Optimized laser parameters for the two-color waveform at different initial conditions

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Pulse duration /fs	$E_{1} / (\times 10^{14} W / c m^{2})$	$α_{1} / (\times 10^{2} a . u .)$	$β_{1} / (\times 10^{2} a . u .)$	$β_{2} / (\times 10^{2} a . u .)$
24	1.50	0.99	-2.60	-1.80
32	1.52	0.91	-2.56	-1.72

Table 2. Optimized laser parameters for the two-color waveform for laser durations of 24 fs and 32 fs, respectively

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Run index	$E_{1} / (\times 10^{14} W \cdot c m^{- 2})$	$α_{1} / (\times 10^{2} a . u .)$	$β_{1} / (\times 10^{2} a . u .)$	$β_{2} / (\times 10^{2} a . u .)$
1	1.48	0.80	-2.99	-2.87
2	1.48	0.82	-3.05	-2.88
3	1.49	0.88	-3.11	-2.56
4	1.49	0.84	-3.20	-2.52
5	1.49	0.83	-3.10	-2.56

Table 3. Optimized laser parameters for the two-color waveform at different initial conditions

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