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Shu H.,Shanghai Institute of Laser Plasmas | Fu S.,Shanghai Institute of Laser Plasmas | Huang X.,Shanghai Institute of Laser Plasmas | Jia G.,Shanghai Institute of Laser Plasmas | And 4 more authors.
Chinese Optics Letters | Year: 2010

Direct-drive and indirect-drive inertial confinement fusion (ICF) targets use temporally shaped drive pulses to optimize target performance. The timing of multiple shock waves is crucial to the performance of ICF ignition targets. Velocity interferometer system for any reflector (VISAR) is the principal diagnostic tool for shock-timing experiments. We present velocity measurements from the shock waves in polystyrene targets driven by two 200-ps pulses separated by 1-2 ns. These pulses drive two shock waves that coalescence in the target. Coalescence time and transit times are observed by VISAR. © 2010 Chinese Optics Letters.


Zhang G.-W.,CAS Shanghai Institute of Optics and fine Mechanics | Lu X.-Q.,CAS Shanghai Institute of Optics and fine Mechanics | Cao H.-B.,CAS Shanghai Institute of Optics and fine Mechanics | Yin X.-H.,CAS Shanghai Institute of Optics and fine Mechanics | And 6 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2012

The near-field diffraction characteristics when a high-power laser beam traverses contaminant particles are studied by using the designing software of high-power laser drivers-Laser designer. The modulations generated by contaminant particles are sorted. Then the influence of contaminant particles with amplitude or phase modulation on the near-field intensity distribution in vacuum or in fused silica is analyzed in great detail. The results show that in both vacuum and fused silica, the phase modulated contaminant particles have a greater influence on the near-field properties of high-power laser. Moreover, it is found that in fused silica, the small-scale self-focusing hot-image modulation of high-power laser induced by phase modulated hard-edge contaminant particles is momentous. But the lateral shift of high-power laser beam caused by contaminant particles maybe inhibits the small-scale self-focusing effect to some extent, thereby reducing the laser injury risk of optical component. © 2012 Chinese Physical Society.


Zhang G.,CAS Shanghai Institute of Optics and fine Mechanics | Lu X.,CAS Shanghai Institute of Optics and fine Mechanics | Zhou S.,CAS Shanghai Institute of Optics and fine Mechanics | Ma W.,Shanghai Institute of Laser Plasmas | Zhu J.,Shanghai Institute of Laser Plasmas
Chinese Optics Letters | Year: 2014

Flat-topped beam theoretical model and unified theory of coherence and polarization of light are used as the bases in examining aberrated, partially coherent, electromagnetic, square, flat-topped pulsed beams focused by a thin lens. This study demonstrates that Astigmatism is not necessarily undesirable in certain circumstances, and a certain amount of astigmatism can be guaranteed a similar spatial envelope of the beams in the geometric focal plane as the source of aberrated, partially coherent, electromagnetic, square, flat-topped pulsed beams. This feature may be useful in determining the fidelity of high-power laser-beam transmission areas. © 2014 Chinese Optics Letters.


Yin X.,CAS Shanghai Institute of Optics and fine Mechanics | Zhuang Y.,CAS Shanghai Institute of Optics and fine Mechanics | Zhang Y.,CAS Shanghai Institute of Optics and fine Mechanics | Zhang G.,CAS Shanghai Institute of Optics and fine Mechanics | And 4 more authors.
Chinese Optics Letters | Year: 2014

To study how laser pulse wavelength will affect the damage characteristics of optical elements with different degrees of contamination, we compare the extent of damage on optical glass between nanosecond pulsed laser of 1064 and 355 nm wavelength, respectively, and reach the following conclusions: the surface quality of clean optical elements determines its own anti-laser damage capability; the damage probability of optical sample caused by ultraviolet radiation-induced organic contamination is much higher than the infrared radiation-induced one; and contaminated metal particles can lower damage threshold of optical elements by 2-3 times. © 2014 Chinese Optics Letters.

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