Effects of COVID-19 lockdown on the observed density of coral reef fish along coastal habitats of Moorea, French Polynesia.
Effects of COVID-19 lockdown on the observed density of coral reef fish along coastal habitats of Moorea, French Polynesia.
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COVID-19 封锁对法属波利尼西亚莫雷阿岛沿海栖息地珊瑚礁鱼类观测密度的影响。
DOI：
10.1007/978-3-319-19521-6_16
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发表时间：
2023
影响因子：
4.2
通讯作者：
Bertucci F
中科院分区：
文献类型：
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作者：
Bertucci F
相对论性激光-固体相互作用（wcm聚焦强度）产生的高次谐波有可能作为明亮阿秒辐射的来源。产生这种辐射的一个关键机制是相对论振荡镜（ROM），其中密度过大的等离子体表面以相对论速度振荡，导致反射激光辐射的多普勒上移。这种谐波源应用的一个主要障碍是，辐射以与驱动激光频率一致的周期性脉冲串的形式发射。将这种发射限制在单个脉冲的一种方法是，通过形成一个极化从圆形到线性再到圆形变化的脉冲，利用这些机制的椭圆性依赖性——一种称为极化门控的技术。在小入射角下，圆极化时ROM机制的效率会急剧下降。本文提出了一种实现该技术的新方法，并给出了原理验证实验结果。
High order harmonic generation from relativistic laser-solid interactions (focused intensity ofWcm) has the potential to serve as a source of bright attosecond radiation. One key mechanism that can generate such radiation is the Relativistically Oscillating Mirror (ROM) where the overdense plasma surface oscillates at relativistic velocities leading to a Doppler upshift of the reflected laser radiation. A major obstacle to the application of such a harmonic source is that the radiation is emitted as a periodic pulse train with the frequency of the driving laser. One route to limiting this emission to a single pulse is to exploit the ellipticity dependence of these mechanisms by forming a pulse whose polarisation varies from circular to linear to circular—a technique known as polarization gating. At small angles of incidence it is expected that the efficiency of the ROM mechanism drops dramatically for circular polarization. Here we present a novel method of implementing this technique for high power laser pulses along with proof of principle experimental results.