XUV Emissions from Terawatt Femtosecond Laser Produced Plasma Columns in Gases
Terawatt femtosecond laser pulses were focused into a gas cell to produce plasma columns in gases of N 2, O 2, and He. The axial xuv emission spectra that were generated are reported and analyzed. The xuv amplifications on transitions of NIII 3s(2 S) − 2p(2 P) at 45.2 nm and OIII 2p3s(3 P) − 2p 2(3 P) at 37.4 nm in low-charged nitrogen and oxygen ions were successfully demonstrated by a linearly-polarized 100-fs pump laser pulse of only 25 mJ. Strong axial xuv emission lines from a laser-produced plasma column in helium gas were also observed, however, no amplification was observed for the L α , line at 30.3 nm. High-order harmonics from a helium plasma column were also investigated with different pump energies under the defocusing condition for the laser beam.
KeywordsLithium Recombination Helium Sapphire Kato
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- 2.DL. Huffier et al., Phys. Rev. Lett. 48, 1814 (1982).Google Scholar
- 3.T. S. Luk et al., Phys. Rev. Lett. 51, 110 (1983).Google Scholar
- 4.P. B. Corkum, N. H. Burnett, and F. Brunel, Phys. Rev. Lett. 62, 1259 (1989).Google Scholar
- 5.M. D. Perry et al., Phys. Rev. Lett. 60, 1270 (1988).Google Scholar
- 7.J. Peyraud and N. Peyraud, J. Phys. 43, 2993 (1972).Google Scholar
- 8.N. H. Burnett and G. D. Enright, IEEE J. Quantum Electron, 26, 1797 (1990).Google Scholar
- 14.H. Nakano et al., in “X-ray Lasers 1998”, ed. by Y. Kato and H. Takuma, Inst. Phys. Conf. Ser. No. D159, 1999 IOP Publishing, pp535–538Google Scholar
- 15.M. V. Ammosov et al., Sov. Phys. JETP 64, 1191 (1986).Google Scholar
- 18.J. L. Krause et al., Phys. Rev. Lett. 68, 3535 (1992).Google Scholar