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We demonstrate strong lasing on the Ni-like 4d(1)S(0)?4p(1)P(1) transition at 18.9, 20.3, 22.0, and 24.0 nm for Mo, Nb, Zr, and Y ions, respectively, using the transient collisional excitation scheme. Approximately 5 J of laser energy in a combination of a 600-ps pulse and a 1-ps pulse from the Compact Multipulse Terawatt (COMET) tabletop laser system is used to irradiate slab targets of these materials. Small-signal gains of 17-26cm (-1) are determined on the 4d?4p transition, with overall gain-length products gL of 11-12. Lasing is observed and gain is measured on the 4f(1)P(1)?4d(1)P(1) transition, which is pumped by collisional excitation combined with self-photopumping, for what is to our knowledge the first time. 相似文献
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S. A. Pikuz A. Maksimchuk D. Umstadter M. Nantel I. Yu. Skobelev A. Ya. Faenov A. Osterheld 《JETP Letters》1997,66(7):480-486
Laser satellites are detected in the emission spectra of magnesium and aluminum plasmas produced by femtosecond laser pulses.
This is made possible by the realization of picosecond time resolution in a high-luminosity x-ray spectrograph with a spherically
curved mica crystal. The temporal characteristics of these newly recorded spectral lines show unequivocally that they are
formed as a result of nonlinear processes.
Pis’ma Zh. éksp. Teor. Fiz. 66, No. 7, 454–459 (10 October 1997) 相似文献
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The Na3PO4Pb3(PO4)2 system was studied by thermal analysis, high-temperature microscopy, and X-ray diffraction powder methods. The compound NaPbPO4 melts congruently at 1117°C. An unidentified phase occurs in the vicinity of 10 mole% Pb3(PO4)2. The system has eutectics at 44.5 and 96 mole% Pb3(PO4)2, melting at 1074 and 1004°C, respectively. The respective melting points of Na3PO4 and Pb3(PO4)2 are 1512 and 1015°C. 相似文献
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A. M. Urnov J. Dubau A. Ya. Faenov T. A. Pikuz I. Yu. Skobelev J. Abdallah R. E. H. Clark J. Cohen R. P. Johnson G. A. Kyrala M. D. Wilke A. L. Osterheld 《JETP Letters》1998,67(7):489-494
A new type of quasicontinuous emission spectrum from a femtosecond laser plasma near the Lyα line of H-like ions is obtained and interpreted. It is shown that these spectra are emitted by multiply charged hollow ions,
which are present in the plasma on account of its ultrahigh density, which, in turn, is due to the use of high-contrast laser
pulses for producing the plasma. A new spectroscopic approach based on analysis of the composition of spectral complexes of
hollow ions is discussed.
Pis’ma Zh. éksp. Teor. Fiz. 67, No. 7, 467–472 (10 April 1998) 相似文献