The experimental investigations of double-pass amplification of X-ray laser in neon-like germanium were carried out by use of Shengguang laser facilities.In these experiments a molybdenum/silicon multilayer mirror Was...The experimental investigations of double-pass amplification of X-ray laser in neon-like germanium were carried out by use of Shengguang laser facilities.In these experiments a molybdenum/silicon multilayer mirror Was used at normal incidence, a flat-field grating spectrograph was used to measure the intensity of lasing lines. We observed the doublepass emission intensity in the neon-like germanium at 23.2 and 23.6 nm that was 5 times larger than that of the single-pass ASE. The enhartcement of double-pass emission could be much larger if the operation period of multilayer mirror was counted in. The damage of multilayer mirror irradiated by laser plasma was measured simultaneously, the lifetime of Mo/Si multilayer mirror was about 440—700ps.In addition, we measured the beam divergence of lasing beam,the resnlts showed that the beam divergence in the vertical direction was about 22 mrad and in the horizontal direction about 12 mrad.展开更多
A high power laser system delivering a 20-TW, 0.5-0.8 ps ultra-short laser pulse and a 20-J, 500-ps long pulse simultaneously in one shot is completed. This two-beam laser operates at the wavelength of 1053 nm and use...A high power laser system delivering a 20-TW, 0.5-0.8 ps ultra-short laser pulse and a 20-J, 500-ps long pulse simultaneously in one shot is completed. This two-beam laser operates at the wavelength of 1053 nm and uses Nd doped glass as the gain media of the main amplification chain. The chirped-pulse amplification (CPA) technology is used to compress the stretched laser pulse. After compression, the ultra-short laser pulse is measured: energy above 16.0 J, S/N contrast ratio-10~5 : 1, filling factor->52.7%. Another long pulse beam is a non-compressed chirped laser pulse, which is measured: energy-20 J, pulse duration 500 ps. The two beams are directed onto the target surface at an angle of 15°.展开更多
基金Project supported by the National High Technique Plan in the high power laser field
文摘The experimental investigations of double-pass amplification of X-ray laser in neon-like germanium were carried out by use of Shengguang laser facilities.In these experiments a molybdenum/silicon multilayer mirror Was used at normal incidence, a flat-field grating spectrograph was used to measure the intensity of lasing lines. We observed the doublepass emission intensity in the neon-like germanium at 23.2 and 23.6 nm that was 5 times larger than that of the single-pass ASE. The enhartcement of double-pass emission could be much larger if the operation period of multilayer mirror was counted in. The damage of multilayer mirror irradiated by laser plasma was measured simultaneously, the lifetime of Mo/Si multilayer mirror was about 440—700ps.In addition, we measured the beam divergence of lasing beam,the resnlts showed that the beam divergence in the vertical direction was about 22 mrad and in the horizontal direction about 12 mrad.
基金This work was supported by the National 863-804 (former 416)-2 Hi-Tech Program of China.
文摘A high power laser system delivering a 20-TW, 0.5-0.8 ps ultra-short laser pulse and a 20-J, 500-ps long pulse simultaneously in one shot is completed. This two-beam laser operates at the wavelength of 1053 nm and uses Nd doped glass as the gain media of the main amplification chain. The chirped-pulse amplification (CPA) technology is used to compress the stretched laser pulse. After compression, the ultra-short laser pulse is measured: energy above 16.0 J, S/N contrast ratio-10~5 : 1, filling factor->52.7%. Another long pulse beam is a non-compressed chirped laser pulse, which is measured: energy-20 J, pulse duration 500 ps. The two beams are directed onto the target surface at an angle of 15°.
