A5013082784- Laser-Plasma Interactions and Diagnostics
- Optical Systems and Laser Technology
- Laser Material Processing Techniques
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Advanced Surface Polishing Techniques
- Ocular and Laser Science Research
- Advanced X-ray Imaging Techniques
- Laser-induced spectroscopy and plasma
- Advanced Optical Sensing Technologies
- Optical measurement and interference techniques
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- High-pressure geophysics and materials
- Surface Roughness and Optical Measurements
- Laser Design and Applications
- Digital Holography and Microscopy
- Nonlinear Optical Materials Studies
- Electromagnetic Compatibility and Measurements
- Optical Coatings and Gratings
- Diamond and Carbon-based Materials Research
- Erosion and Abrasive Machining
- Advanced Electron Microscopy Techniques and Applications
- Advanced optical system design
- Crystallography and Radiation Phenomena
Shanghai Institute of Optics and Fine Mechanics
2014-2024
Chinese Academy of Sciences
2013-2023
Chinese Academy of Engineering
2023
University of Chinese Academy of Sciences
2014-2022
In this paper, we review the status of multifunctional experimental platform at National Laboratory High Power Laser and Physics (NLHPLP). The platform, including SG-II laser facility, 9th beam, upgrade (SG-II UP) 5 PW is operational available for interested scientists studying inertial confinement fusion (ICF) a broad range high-energy-density physics. These facilities can provide important capabilities by combining different pulse widths nanosecond, picosecond, femtosecond scales....
In high power laser facility for inertial confinement fusion research, final optics assembly (FOA) plays a critical role in the frequency conversion, beam focusing, color separation, sampling and debris shielding. The design performance of FOA SG-II Upgrade are mainly introduced here. Due to limited space short focal length, coaxial aspheric wedged focus lens is designed applied configuration. Then ghost image analysis, characteristic B integral control optomechanical carried out phase....
The Shen-Guang II Upgrade (SG-II-U) laser facility consists of eight high-power nanosecond beams and one short-pulse picosecond petawatt laser. It is designed for the study inertial confinement fusion (ICF), especially conducting fast ignition (FI) research in China other basic science experiments. To perform FI successfully with hohlraum targets containing a golden cone, long-pulse beam cylindrical as well cone target alignment must satisfy tight specifications (30...
The high fluence performance of high-power laser systems is set by optical damage, especially in the final optics assembly (FOA). flaws on frequency converter surface can cause intensity intensification and, therefore, damage downstream elements, such as beam sampling grating (BSG), which an important component FOA. Mitigation BSG caused discussed. Physical models are established to simulate field enhancement modulated upstream flaw, considering both linear and nonlinear propagation effects....
Abstract Frequency modulation (FM)-to-amplitude (AM) conversion is an important factor that affects the time–power curve of inertial confinement fusion (ICF) high-power laser facilities. This can impact uniform compression and increase risk damage to optics. However, dispersive grating used in smoothing by spectral dispersion technology will introduce a temporal delay spatially smooth target. The combined effect focusing lens equivalent Gaussian low-pass filter, which 8 GHz bandwidth reduce...
A new high power laser facility with 8 beams and maximum output energy of one beam 5kJ/3.4ns/3ω has been performed operated since 2015. Combined together the existing facilities have constructed a multifunction experimental platform including multi-pulse width ns, ps fs active probing beam, which is an effective tool for Inertial Confinement Fusion (ICF) High Energy Density (HED) researches. In addition another peculiar prototype pushes 1ω to 16kJ in 5ns 17.5kJ 20ns flat-in-time...
Phase defect detection with micrometer scale on large aperture optical elements is one of the challenges in precision systems. An efficient scheme proposed to detect phase defects. First, defects are positioned a by dark-field imaging based photon sieves improve efficiency relatively low cost. Second, static multiplanar coherent diffraction used retrieve small field view. Here, spatial light modulator as multifocal negative lens eliminate mechanical errors imaging. The use instead positive...
Abstract Considering the time delay in different hohlraum wall positions caused by oblique incidence, spatio-temporal optical field distribution characteristics of a wall, especially during rising edge flat-topped pulse, is simulated fast Fourier transform method together with chromatography. Results demonstrate that beam propagation along push-broom process complex dynamic spatial–temporal evolution. In first few picoseconds, intensity front position increases rapidly, while rear relatively...
Enhancing performance status of final optics assembly on high power laser at 351nm is experimentally studied. We demonstrate 61 shots 310mm × laser. The maximum energy flux 5.5J/cm<sup>2</sup>. conversion efficiency more than 72%. And the perforation across 800μm 3000J 96%. These results provide valuable information to improve research
We propose two efficient methods of determining damage growth threshold (DGT) based on the saturation size analysis (SDSA) for multilayer dielectric gratings by picosecond pulsed lasers. The at laser fluences above DGT increases with shot number and finally saturates due to Gaussian focal spot. is extracted mapping boundary a site obtained single fluence beam profile, which called monofluence SDSA method. Meanwhile, decreases when reducing fluence. fitting extrapolation sizes different are...
Laser induced damage in the final optics assembly is one of bottleneck problems high power laser systems for inertial confinement fusion. Defects on optical elements can cause intensity intensification and therefore downstream. However, only single defect considered most cases. In this paper, physical models are established to study enhancement light related distribution defects assembly. Results show that, when distance two localized reduces a certain distance, there will be stronger duo...
Nonlinear hot image is one of the key elements that limit output performance high-power laser systems. In most hot-image researches, only peak observed in conjugate position for a single defect. Generally, multiple peaks occur defects or cascaded nonlinear media. However, new phenomenon found by numerical simulation our work: defect can also afford two near when considering edge steepness. The super-Gaussian model employed to mimic When order higher than one, there could be under certain...
The lack of rapid, effective, and quantitative testing methods in the initial stages optical processing has been identified as a significant challenge. In response, an innovative approach developed to enhance Foucault knife-edge test method, integrating digital image spatial geometry algorithms. This resulted creation convenient rapid which successfully implemented practice. method requires collection only two shadow grams, are then subjected calculation. enables theoretical results gram at...
The latest progress on high power laser facilities in NLHPLP was reported. Based a prototype, damage behavior of 3ω optics experimentally tested, and the key influencing factors contributed to laser-induced were deeply analyzed. experimental results advanced precision measurement for optical quality applied facility introduced. At last, based accumulated works elements status our laboratory, beam expanding scheme presented increase total maximum output energy properly decrease induced...
3ω laser damage of fused silica optics is the bottleneck high power systems for ICF. Excellent beam quality plays an important role in improving anti-damage capability final system. We have developed a new optical field measurement technology based on computational imaging. With prototype SGII-UP facility, resistance was experimentally studied. The near filed measured with resolution to study effects modulation and propagation damage. improvement are reported influence performance discussed....