Although there are many reports on the resonant absorption and the second harmonic of laser plasma in recent years, these phenomena were treated individually and no study on their interaction has been carried out. We ...Although there are many reports on the resonant absorption and the second harmonic of laser plasma in recent years, these phenomena were treated individually and no study on their interaction has been carried out. We used a Nd: glass laser （3—6 Joules, 100 ps pulses） to irradiate plane aluminium targets with a power density of —1015 W/cm2 on the tartar surface.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
文摘Although there are many reports on the resonant absorption and the second harmonic of laser plasma in recent years, these phenomena were treated individually and no study on their interaction has been carried out. We used a Nd: glass laser （3—6 Joules, 100 ps pulses） to irradiate plane aluminium targets with a power density of —1015 W/cm2 on the tartar surface.
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°.
