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Results and DiscussionsThe highintensity picosecond pulsepumped front end exhibits an OPP with a GDD of 71 fs² and a TOD of 1092 fs³ [Fig. 2(a)]. These values are obtained by fitting a thirdorder polynomial to the numerically calculated OPP within the wavelength range of 740 -880 nm, which is the output spectrum range based on the numerical calculations [Fig. 2(b)]. The GDD and TOD values obtained by fitting a polynomial to the analytically calculated OPP are 83 fs² and 1370 fs³, respectively. Therefore, compared to the numerically calculated OPP, the main difference between the two lies in the TOD for the highintensity picosecond pulsepumped front end. For highenergy nanosecond pulsepumped power amplifiers, including the preamplifier, booster amplifier, and main amplifier, the numerically calculated OPP is almost the same as the analytically calculated OPP [Figs. 3(a) and 4(a)]. For the preamplifier, the GDD and TOD obtained from the OPP are 158 fs 2 and 2398 fs 3 , respectively, whereas for the booster and main amplifier, the total GDD and TOD induced by the OPP are 302 fs 2 and 2405 fs 3 , respectively. These results reveal that for the SILEX -II laser system, the OPP induces a GDD of 532 fs 2 and a TOD of fs 3 [Fig. 5(a)], and the peak intensity of the compressed pulse is only 43% of that of the Fourier transformlimited pulse [Fig. 5(b)]. By compensating for the GDD of the OPP, the peak intensity of the compressed pulse can be increased to 94% compared to that of the Fourier transformlimited pulse [Fig. 5(b)]. ConclusionsIn conclusion, a thorough study of the OPP evolution in the SILEX -II full OPCPA system at the China Academy of Engineering Physics is conducted. The OPP evolution across the entire SILEX -II laser system is obtained by numerically solving coupled wave equations combined with analytical formulas. The results reveal that the SILEX -II laser system accumulates a GDD of up to 532 fs² and a TOD of up to 5782 fs³ due to the optical parametric amplification process. Consequently, the peak intensity of the compressed pulse is only 43% of that of the Fourier transformlimited pulse. Further calculations indicate that after compensating for the GDD induced by the OPP, the peak intensity of the compressed pulse increases to 94% of that of the Fourier transformlimited pulse. These findings offer invaluable theoretical guidance for the temporal compression of the SILEX -II laser system. In practical applications, the grating distance in the compressor can be precisely adjusted to offset the extra GDD . Additionally, this study paves the way for the design of future 10 -100 PW peakpower lasers utilizing full OPCPA technology, suggesting that global OPP control should be taken into consideration during the design process.
Significance As a desktoplevel extreme ultraviolet (EUV) coherent light source, high harmonic generation (HHG) becomes an indispensable tool in fundamental science fields such as atomic and molecular physics, biomedicine, materials chemistry, and precision spectroscopy. The maximum photon energy of high harmonics in gas extends to the soft Xray spectral range. Based on the appropriate gating technique of high harmonics, it is possible to generate isolated attosecond pulses with tens of attoseconds pulse widths, providing feasibility for the study of electron motion in atomic and molecular systems on the attosecond time scale. In addition
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