Experimental Investigation into Polycrystalline and Single-Crystal Diamonds under Negative Pressures Formed by Picosecond Laser Pulsesстатья
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Дата последнего поиска статьи во внешних источниках: 5 сентября 2016 г.
Аннотация:Results of the experimental investigation of the spallation phenomenon in polycrystalline and single-crystal synthetic diamond are presented. The shock-wave action on the target was formed by a laser pulse with a duration of 70 ps using a Kamerton-T installation. To attain the ablation pressure of 0.66 TPa on the face surface of the target, the laser radiation of the Nd: glass laser (second harmonics lambda = 527 nm, the pulse energy is 2.5 J) was used at intensity up to 2 x 10(13) W/cm(2). The attained maximal spall strength of diamond sigma*-16.5 GPa is 24% of the theoretical ultimate strength. The Raman scattering indicates that a small amount of crystalline diamond is graphitized in the spall region on the back target side.