We present preliminary studies of the laser-imploded glass microballons by our newly developed multi-frame X-ray shadowgraphy which is in good agreement with our simulation calculation.The study shows that uniform ill...We present preliminary studies of the laser-imploded glass microballons by our newly developed multi-frame X-ray shadowgraphy which is in good agreement with our simulation calculation.The study shows that uniform illumination is an important factor for good implosions.展开更多
Phase-matched high-order harmonic generation in Ar gas-filled cell was investigated experimentally. We obtained phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system...Phase-matched high-order harmonic generation in Ar gas-filled cell was investigated experimentally. We obtained phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system at 0.55 mJ/pulse energy level and 1 kHz repetition rate. To our knowledge, this is the lowest driving laser energy used to obtain phase-matched 27th order harmonic in a static gas cell. High-order harmonic generation at different gas density was studied systematically. Spectral blueshift and broadening of high harmonics under different pressure were analyzed. We found that the source size and spatial distribution of high-order harmonics are quite different under the phase-matching condition from those of the phase-mismatching case.展开更多
基金This work was partially supported by Science Fund of the Chinese Academy of Science。
文摘We present preliminary studies of the laser-imploded glass microballons by our newly developed multi-frame X-ray shadowgraphy which is in good agreement with our simulation calculation.The study shows that uniform illumination is an important factor for good implosions.
基金The work was supported by the National Natural Science Foundation of China(Grant Nos.69925513 and 19974058)the Chinese National Major Basic Research Project(Grant No.G1999075204).
文摘Phase-matched high-order harmonic generation in Ar gas-filled cell was investigated experimentally. We obtained phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system at 0.55 mJ/pulse energy level and 1 kHz repetition rate. To our knowledge, this is the lowest driving laser energy used to obtain phase-matched 27th order harmonic in a static gas cell. High-order harmonic generation at different gas density was studied systematically. Spectral blueshift and broadening of high harmonics under different pressure were analyzed. We found that the source size and spatial distribution of high-order harmonics are quite different under the phase-matching condition from those of the phase-mismatching case.
