基于神光Ⅱ的激光黑腔靶全孔径背反散射光信号
Full aperture backscatter signal analysis of laser with hohlraum on Shenguang Ⅱ laser facility
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摘要: 介绍了神光Ⅱ装置激光黑腔靶实验中全孔径背反系统的工作原理，分析了激光靶耦合背反系统对散射光的收集情况，发现打靶产生的散射光完全进入背反收光系统，同时，8路激光对穿打靶时全孔径背反系统中存在杂散背景光。采用场图感光纸结合滤光片的方式对杂散背景光成分进行了分析，结果表明，杂散光的成分为打靶激光倍频过程中剩余的部分二倍频和基频光。在北4路激光注入打靶时，用南4路全孔径背反系统的能量测量系统对南4路背反系统中的杂散光进行了监测，显示杂散光对背反系统SRS能量测量的影响约为15%。Abstract: Full aperture backscatter system and experimental measurement of hohlraum with 351 nm wavelength laser on Shenguang Ⅱ laser facility is reported. FABS optical path has been analyzed and the backscattering light completely entried FABS collecting optical path. FABS existed the background light when the eight beams symmetrically acted on hohlraum. The background light is composed of 526.5 nm and 1 053 nm wavelength remains while the 1 053 nm wavelength changes into 351 nm wavelength, according to records of laser sensitive paper and optical filter. The background light accounts for 15% of FABS energy from experimental measurement result.
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Key words:
- laser plasma /
- scattering light /
- energy balance /
- stimulated raman scattering /
- hohlraum /
- coupling efficiency
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