Photoionization and residual energy in ultrashort-pulse laser

Shigang Chen; Jie Liu; Dehai Bao; Bryan Nie

doi:10.1117/12.221625

25 September 1995 Photoionization and residual energy in ultrashort-pulse laser

Shigang Chen, Jie Liu, Dehai Bao, Bryan Nie

Proceedings Volume 2520, Soft X-Ray Lasers and Applications; (1995) https://doi.org/10.1117/12.221625
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The above-threshold ionizations (ATI) in intense laser field are studied by the methods of S- matrix and classical dynamics, respectively. It is shown that from the viewpoint of gauge invariance, the Keldysh theory is more reliable than Reiss theory. Then, the Keldysh theory is developed further to satisfy the law of parity conservation and to give more reasonable results. The ionization rate predicted by classical dynamics is in agreement with tunneling theory as the field strength is near and above threshold field and approaches Keldysh's rate as the field strength is higher than threshold field. The space charge effect is analyzed using the technique of multiple-time-scale perturbation. It is found that the effect on residual energy is great as the half plasma period is larger than pulse length or the plasma density approaches critical density, however, it cannot reduce the ATI energy significantly over whole density range. Finally, it is pointed out that for a given pump laser there may be a density range available for optical field ionization (OFI) x-ray laser over which only the ATI heating plays a role.

Citation Download Citation

Shigang Chen, Jie Liu, Dehai Bao, and Bryan Nie "Photoionization and residual energy in ultrashort-pulse laser", Proc. SPIE 2520, Soft X-Ray Lasers and Applications, (25 September 1995); https://doi.org/10.1117/12.221625

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