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In this paper, intensity distribution of 69.8 nm soft X-ray laser pumped by capillary discharge is studied theoretically and experimentally. In experiment, a main current of 11.5 kA is chosen to generate the plasma in a 35 cm long capillary filling with Ar at pressures in a range of 14-16 Pa. The intensity distribution is characterized by two different components. There is a big peak in the center of the intensity distribution profile, and its full width at half maximum divergence is about 0.4 mrad. There are also two small off-axis peaks on the either side of the center peak, and the peak-to-peak divergence is about 1.5 mrad. In theory, three different distributions of electron density are used to study the propagation of Ne-like Ar 69.8 nm laser in a cylindrical plasma column. The spatial intensity distribution for the 69.8 nm laser beam is calculated with the geometrical optics approximation. The results show that the center peak, which has such a small divergence, could be attributed to the slight depression of electron density on the axis.
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Keywords:
- 69.8 nm /
- capillary discharge /
- intensity distribution /
- electron density
[1] Macchietto C D, Benware B R, Rocca J J 1999 Opt. Lett. 24 1115
[2] Rocca J J, Tomasel F G, Marconi M C, Shlyaptsev V N, Chilla J L A, Szapiro B T, Giudice G 1995 Phys. Plasmas 2 2547
[3] Hildebrand A, Ruhnnann A, Maurmann S, Kunze H J 1996 Phys. Lett. A 221 335
[4] Zhao Y P, Jiang S, Xie Y, Yang D W, Teng S P, Chen D Y, Wang Q 2011 Opt. Lett. 36 3458
[5] Chilla J L A, Rocca J J 1996 J. Opt. Soc. Am. B 13 2841
[6] London R A 1988 Phys. Fluids 31 184
[7] Ritucci A, Tomassetti G, Reale A 2004 Appl. Phys. B 78 965
[8] Ritucci A, Tomassetti G, Reale A, Flora F, Mezi L 2004 Phys. Rev. A 70 023818
[9] Tomassetti G, Ritucci A, Reale A, Palladino L, Reale L, Kukhlevsky S V, Flora F, Mezi L, Faenov A, Pikuz T, Gaudieri A 2004 Opt. Commun. 231 403
[10] Zhao Y P, Cheng Y L, Luan B H, Wu Y C, Wang Q 2006 J. Phys. D: Appl. Phys. 39 342
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[1] Macchietto C D, Benware B R, Rocca J J 1999 Opt. Lett. 24 1115
[2] Rocca J J, Tomasel F G, Marconi M C, Shlyaptsev V N, Chilla J L A, Szapiro B T, Giudice G 1995 Phys. Plasmas 2 2547
[3] Hildebrand A, Ruhnnann A, Maurmann S, Kunze H J 1996 Phys. Lett. A 221 335
[4] Zhao Y P, Jiang S, Xie Y, Yang D W, Teng S P, Chen D Y, Wang Q 2011 Opt. Lett. 36 3458
[5] Chilla J L A, Rocca J J 1996 J. Opt. Soc. Am. B 13 2841
[6] London R A 1988 Phys. Fluids 31 184
[7] Ritucci A, Tomassetti G, Reale A 2004 Appl. Phys. B 78 965
[8] Ritucci A, Tomassetti G, Reale A, Flora F, Mezi L 2004 Phys. Rev. A 70 023818
[9] Tomassetti G, Ritucci A, Reale A, Palladino L, Reale L, Kukhlevsky S V, Flora F, Mezi L, Faenov A, Pikuz T, Gaudieri A 2004 Opt. Commun. 231 403
[10] Zhao Y P, Cheng Y L, Luan B H, Wu Y C, Wang Q 2006 J. Phys. D: Appl. Phys. 39 342
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