Details

Autor(en) / Beteiligte

• Huang, Xiaoxia
• Deng, Xuewei
• Guo, Huaiwen
• Wang, Fang
• Zhou, Wei
• Hu, Dongxia
• Zhao, Bowang
• Zhong, Wei
• Deng, Wu
• Zhao, Junpu

Titel

Small-scale self-focusing assessment using PSD Shannon entropy of a 3ω process in a high-power laser facility

Ist Teil von

• Fusion engineering and design, 2020-02, Vol.151, p.111410, Article 111410

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •PSD entropy provides a clear criterion for SSSF development in high power laser facility.•PSD entropy is proved to be more suitable for 3ω process than intensity entropy.•PSD entropy has potential application in the design and operation of high-power laser facility.•The research provides a wider application of Shannon entropy. A high-power laser facility produces a high power-density laser to drive the target compression. When the facility works at extremely high fluences, the laser may induce small-scale self-focusing, which damages the optics. To ensure safe operation, we propose a method using power spectral density (PSD) entropy to judge the occurrence and assess the development of small-scale self-focusing in the final optics assembly of a high-power laser facility. In this method, Shannon entropy statistics is adopted to analyze the PSD change in the output near-field image. The results show that, as the operating fluence increases, the PSD Shannon entropy curve displays an evident turning point when the small-scale self-focusing begins to develop. PSD Shannon entropy is superior to the intensity entropy method in detecting small-scale self-focusing in this process. It also supplements Shannon entropy applications.