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SongPo Xu on Muck Rack

SongPo Xu

As seen in: Physical Review B, Optica
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Articles

Cavity-enhanced harmonic generation of an optical frequency comb with Laguerre–Gaussian mode

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By Zhong Zuo, Shaogang Yu, SongPo Xu, Xiaojun Liu
| Optica Verified
Tailoring the resonant transverse mode of a femtosecond enhancement cavity (fsEC) is of vital importance in manipulating light–matter interaction in a laser cavity. In this study, the transverse mode of a driving near-infrared optical frequency comb is tailored from a Hermite–Gaussian (HG) mode to a Laguerre–Gaussian (LG) mode, and then amplified to a kilowatt level in an fsEC for the first time, to our knowledge.
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Wavelength scaling of strong-field Rydberg-state excitation: Toward an effective $S$-matrix theory

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By Mingqing Liu, Optoelectronic Engineering, SongPo Xu
| Physical Review B
S-matrix theory and the Born expansion, the lowest-order term of which is known as the “strong-field approximation” (SFA), play an indispensable role in our understanding of atomic and molecular processes in intense laser fields. Most phenomena in this field are reproduced by the first two terms of the Born series. However, for a long-range potential such as the Coulomb potential, the second-order term may be larger than the SFA term, raising the problem of the convergence of the Born series.
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