论文标题
在非理想真空中可达到的激光强度的上限
On the upper limit of laser intensity attainable in non-ideal vacuum
论文作者
论文摘要
完美真空中激光场强度的上限通常被视为schwinger场，对应于〜10^29W/cm^2。我们研究了在现实的非理想真空条件下的这种局限性，并发现强度抑制从10^25W/cm^2开始，如果室内的残留电子密度超过109cm^ - ^3，则显示在1026W/cm^2水平下的上阈值。这是因为残留电子的存在触发了产生大量电子和正电子对的量子 - 电子动力学级联雪崩。由于辐射反应，瘦素进一步被困在驱动激光场中，这大大耗尽了激光能量。可实现的强度与空缺之间的关系是根据粒子中的模拟和理论分析给出的。这些结果回答了基于当前真空条件的可实现的光强度的关键问题，并为将来的100季度激光开发提供了指南。
The upper limit of the laser field strength in perfect vacuum is usually considered as the Schwinger field, corresponding to ~10^29W/cm^2. We investigate such limitations under realistic non-ideal vacuum conditions and find out that intensity suppression appears starting from 10^25W/cm^2, showing an upper threshold at 1026W/cm^2 level if the residual electron density in chamber surpasses 109cm^-^3. This is because the presence of residual electrons triggers the avalanche of quantum-electrodynamics cascade that creates copious electron and positron pairs. The leptons are further trapped within the driving laser field due to radiation-reaction, which significantly depletes the laser energy. The relationship between the attainable intensity and the vacuity is given according to particle-in-cell simulations and theoretical analysis. These results answer a critical problem on the achievable light intensity based on present vacuum conditions and provide a guideline for future 100's-Petawatt class laser development.
