Rapid variations of the environmental energy caused by ultrashort laser pulses have induced phase transitions in carbon allotropes, therefore bringing the promise of revealing new carbon phases. Here, by exposing polycrystalline graphite to 25 fs laser pulses at 4 J/cm2 fluence under standard air atmosphere, we demonstrated the synthesis of translucent micrometer-sized structures carrying diamond-like and onion-like carbon phases. Texturized domains of the diamond phase were also identified. Concerning different synthesized carbon forms, pulse superposition and singularities of the thermodynamical process, we pinpoint the synthesis mechanism by the laser-induced subsequent products energetically evolving to attain the diamond-like phase.
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机译：由超短激光脉冲引起的环境能量的快速变化已在碳同素异形体中引起相变，因此带来了揭示新碳相的希望。在这里，通过在标准空气气氛下以4 J / cm 2 的通量将多晶石墨暴露于25 fs激光脉冲下，我们证明了具有钻石状和洋葱状碳相的半透明微米级结构的合成。还确定了金刚石相的组织化区域。对于不同的合成碳形式，脉冲叠加和热力学过程的奇异性，我们通过激光诱导的后续产物大力演化以达到类金刚石相来确定合成机理。
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