scholarly journals Surface phase defects induced downstream laser intensity modulation in high-power laser facility

2016 ◽  
Vol 4 ◽  
Author(s):  
Xin Zhang ◽  
Wei Zhou ◽  
Wanjun Dai ◽  
Dongxia Hu ◽  
Xuewei Deng ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Intensity Modulation ◽  
Inertial Confinement ◽  
Surface Phase ◽  
High Power Laser ◽  
Power Laser ◽  
Laser Facility ◽  
Manufacturing Techniques ◽  
Facility Construction

Optics surface phase defects induced intensity modulation in high-power laser facility for inertial confinement fusion research is studied. Calculations and experiments reveal an exact mapping of the modulation patterns and the optics damage spot distributions from the surface phase defects. Origins are discussed during the processes of optics manufacturing and diagnostics, revealing potential improvements for future optics manufacturing techniques and diagnostic index, which is meaningful for fusion level laser facility construction and its operation safety.

Autonomous pulse shaping method for inertial confinement fusion high power laser facility

2020 ◽  
Vol 161 ◽  
pp. 111983
Author(s):  
Xiaoxia Huang ◽  
Xuewei Deng ◽  
Wei Zhou ◽  
Huaiwen Guo ◽  
Bowang Zhao ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Pulse Shaping ◽  
Inertial Confinement ◽  
High Power Laser ◽  
Power Laser ◽  
Confinement Fusion ◽  
Laser Facility

Optical Surface Cleanliness Inspection, Degradation and Maintaining in High Power Laser System

2013 ◽  
Vol 765-767 ◽  
pp. 2288-2293
Author(s):  
Bao Xu Wang ◽  
Mei Cong Wang ◽  
Ming Zhi Zhu ◽  
Xiao Juan Chen ◽  
Wen Kai Wu
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
High Energy Physics ◽  
Laser System ◽  
High Energy ◽  
Inertial Confinement ◽  
Optical Surface ◽  
High Power Laser ◽  
Power Laser ◽  
High Power Laser System

High Power Laser System (HPLS) is a large optical instrument, provides extremely high temperature and pressure conditions for inertial confinement fusion (ICF) and high-energy-physics research. It contains large number of optics and which would be easily damaged due to high fluence of laser power. The contamination control of optical surfaces has a great significance to ensure the performance of the system and decrease costs. This paper discussed the background and development of cleanliness control techniques in high power laser systems, including contamination induced laser damage (CILD), contamination inspection, optical surface cleanliness degradation and maintaining.

scholarly journals Development of low-coherence high-power laser drivers for inertial confinement fusion

2020 ◽  
Vol 5 (6) ◽  
pp. 065201
Author(s):  
Yanqi Gao ◽  
Yong Cui ◽  
Lailin Ji ◽  
Daxing Rao ◽  
Xiaohui Zhao ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
High Power Laser ◽  
Power Laser ◽  
Low Coherence ◽  
Confinement Fusion ◽  
Laser Drivers

Ultra clean manufacturing techniques for final optics assembly in high-power laser facility

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040017
Author(s):  
Xiaodong Yuan ◽  
Caizhen Yao ◽  
Xinxiang Miao ◽  
Haibing Lv ◽  
Guorui Zhou ◽  
...  
Keyword(s):  
High Power ◽  
Surface Cleaning ◽  
High Power Laser ◽  
Power Laser ◽  
Laser Facility ◽  
Laser Systems ◽  
Clean Manufacturing ◽  
Manufacturing Techniques ◽  
Cleaning Methods ◽  
First Time

Cleanliness control is one of the most important processes for final optics assembly (FOA) in high-power laser systems. In this paper, an “Ultra Clean Manufacturing (UCM)” concept is put forward for the first time to satisfy the cleanliness requirements for FOA. First, the challenges and requirements for cleanliness in FOA are introduced and the concept of UCM is proposed. Significant surface cleaning technologies for mechanical parts and optics are then expounded. Finally, surface cleanliness control techniques, such as “gas knife” and “laser cleaning”, are developed as online cleaning methods for the surface cleanliness in FOA.

scholarly journals Silica-Based Sol-Gel Coating with High Transmission at 1053 and 527 nm and Absorption at 351 nm for Frequency-Converting Crystals in High-Power Laser System

2019 ◽  
Vol 9 (23) ◽  
pp. 5038 ◽  
Author(s):  
Xue-Ran Deng ◽  
Wei Yang ◽  
Hao-Hao Hui ◽  
Qing-Hua Zhang ◽  
Qiao Xu ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
Laser Energy ◽  
Laser System ◽  
Sol Gel ◽  
Green Energy ◽  
Inertial Confinement ◽  
High Power Laser ◽  
Power Laser ◽  
High Power Laser System

A high-power laser system is employed to drive the fusion ignition to realize sustainable supply of green energy according to the inertial confinement fusion theory, in which frequency-converting crystals are sealed in the terminal vacuum chamber and utilized to turn the incident laser (1053 nm) to the desired one (351 nm). However, the reflected 351 nm laser from the pellet hohlraum that goes back through the frequency-converting crystal is found to be harmful for the upstream elements that are located before the terminal chamber. In this study, a specialized coating system for the frequency-converting crystals was designed and fabricated to both ensure high output power for the fusion and reduce the reflected 351 nm laser energy by absorption. Furthermore, the structural, mechanical, and laser-damage resistant properties of this coating were investigated as well.

scholarly journals Status and development of high-power laser facilities at the NLHPLP

2018 ◽  
Vol 6 ◽  
Author(s):  
Jianqiang Zhu ◽  
Jian Zhu ◽  
Xuechun Li ◽  
Baoqiang Zhu ◽  
Weixin Ma ◽  
...  
Keyword(s):  
High Power ◽  
Inertial Confinement Fusion ◽  
National Laboratory ◽  
High Energy ◽  
High Energy Density ◽  
Inertial Confinement ◽  
High Power Laser ◽  
Power Laser ◽  
The Status ◽  
Confinement Fusion

In this paper, we review the status of the multifunctional experimental platform at the National Laboratory of High Power Laser and Physics (NLHPLP). The platform, including the SG-II laser facility, SG-II 9th beam, SG-II upgrade (SG-II UP) facility, and SG-II 5 PW facility, is operational and available for interested scientists studying inertial confinement fusion (ICF) and a broad range of high-energy-density physics. These facilities can provide important experimental capabilities by combining different pulse widths of nanosecond, picosecond, and femtosecond scales. In addition, the SG-II UP facility, consisting of a single petawatt system and an eight-beam nanosecond system, is introduced including several laser technologies that have been developed to ensure the performance of the facility. Recent developments of the SG-II 5 PW facility are also presented.

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