Arrangement Design of the Final Optics Assembly for the SG-Ⅱ Upgrading Laser

Zhanfeng, 乔战峰 Qiao; Xingqiang, 卢兴强 Lu; Dongfeng, 赵东峰 Zhao; Baoqiang, 朱宝强 Zhu

doi:10.3788/cjl20083509.1328

中国激光

2008

DOI: 10.3788/cjl20083509.1328

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Arrangement Design of the Final Optics Assembly for the SG-Ⅱ Upgrading Laser

乔战峰 Qiao Zhanfeng¹,

卢兴强 Lu Xingqiang²,

赵东峰 Zhao Dongfeng³

et al.

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Cited by 5 publications

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High illumination uniformity scheme with 32 beams configuration for direct-drive inertial confinement fusion

et al. 2016

Physics of Plasmas

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The self-adapting algorithms are improved to optimize a beam configuration in the direct drive laser fusion system with the solid state lasers. A configuration of 32 laser beams is proposed for achieving a high uniformity illumination, with a root-mean-square deviation at 10−4 level. In our optimization, the parameters such as beam number, beam arrangement, and beam intensity profile are taken into account. The illumination uniformity robustness versus the parameters such as intensity profile deviations, power imbalance, intensity profile noise, the pointing error, and the target position error is also discussed. In this study, the model is assumed a solid-sphere illumination, and refraction effects of incident light on the corona are not considered. Our results may have a potential application in the design of the direct-drive laser fusion of the Shen Guang-II Upgrading facility (SG-II-U, China).

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High illumination uniformity scheme with 32 beams configuration for direct-drive inertial confinement fusion

et al. 2016

Physics of Plasmas

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Studies on design of 351 nm focal plane diagnostic system prototype and focusing characteristic of SGII-upgraded facility at half achievable energy performance

Liu

Yang

et al. 2016

Appl. Opt.

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In order to obtain the intensity distribution of a 351 nm focal spot and smoothing by spectral dispersion (SSD) focal plane profile of a SGII-upgraded facility, a type of off-axis imaging system with three spherical mirrors, suitable for a finite distance source point to be imaged near the diffraction limit has been designed. The quality factor of the image system is 1.6 times of the diffraction limit tested by a 1053 nm point source. Because of the absence of a 351 nm point source, we can use a Collins diffraction imaging integral with respect to λ=351 nm, corresponding to a quality factor that is 3.8 times the diffraction limit at 351 nm. The calibration results show that at least the range of ±10 mrad of view field angle and ±50 mm along the axial direction around the optimum object distance can be satisfied with near diffraction limited image that is consistent with the design value. Using this image system, the No. 2 beam of the SGII-upgraded facility has been tested. The test result of the focal spot of final optics assembly (FOA) at 351 nm indicates that about 80% of energy is encompassed in 14.1 times the diffraction limit, while the output energy of the No. 2 beam is 908 J at 1053 nm. According to convolution theorem, the true value of a 351 nm focal spot of FOA is about 12 times the diffraction limit because of the influence of the quality factor. Further experimental studies indicate that the RMS value along the smoothing direction is less than 15.98% in the SSD spot test experiment. Computer simulations show that the quality factor of the image system used in the experiment has almost no effect on the SSD focal spot test. The image system can remarkably distort the SSD focal spot distribution under the circumstance of the quality factor 15 times worse than the diffraction limit. The distorted image shows a steep slope in the contour of the SSD focal spot along the smoothing direction that otherwise has a relatively flat top region around the focal spot center.

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Influence of Large-Aperture Output Wavefront Distribution on Focal Spot in High-Power Laser Facility

et al. 2023

Photonics

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To improve the focal spot quality, the output wavefront of the Shenguang-II Upgrade facility is divided into four types based on the spatial frequency and division band of power spectral density. The influence of each on the focal spot was quantitatively studied, and the results indicate that the spatial profile, energy concentration, and peak intensity of the focal spot are mainly affected by low-spatial-frequency, and the relative intensity of the sidelobes is greatly affected by both the low- and mid-spatial counterparts. The peak-to-valley value of the wavefront of the Shenguang-II Upgrade should not exceed 2.27λ under the requirement that 50% of the energy is enclosed within 3 times the diffraction limit (DL), and it should be less than 2.45λ under the requirement that 95% is within 10DL. Meanwhile, the Strehl ratio dropped to within 0.2 under these conditions. These results can be applied to focal quality improvement in designing an adaptive optical system, optical element processing, as well as focal spot prediction in high-power laser facilities.

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Arrangement Design of the Final Optics Assembly for the SG-Ⅱ Upgrading Laser

Cited by 5 publications

References 0 publications

High illumination uniformity scheme with 32 beams configuration for direct-drive inertial confinement fusion

High illumination uniformity scheme with 32 beams configuration for direct-drive inertial confinement fusion

Studies on design of 351 nm focal plane diagnostic system prototype and focusing characteristic of SGII-upgraded facility at half achievable energy performance

Influence of Large-Aperture Output Wavefront Distribution on Focal Spot in High-Power Laser Facility

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