航天null检测 | AEgIS实验中正电子偶素的激光激发-北京欧兰科技发展有限公司

方案摘要

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应用领域	航空航天
检测样本	航天
检测项目
参考标准	暂无

采用Ekspla公司的NL300HT激光器泵浦光学参量发生器，产生高能量可调谐纳秒激光输出。在AEgIS实验中，用于激发Na22同位素，产生正电子偶素。

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NL300系列高能量电光调Q激光器
型号：NL300

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方案详情

The AEgIS experimental program on antimatter systems involves the formation of antihydrogen atoms for gravitational and CPT studies. One of the key ingredients of the
AEgIS strategy for the synthesis of antihydrogen atoms is the creation and manipulation
of Positronium (Ps) atoms laser excited to Rydberg states (n > 15).
In AEgIS, Ps is produced in bunched mode and the Rydberg excitation is achieved with
a two laser pulse technique, by passing through a n = 3 intermediate level. Because excitation on Ps n = 3 state has never been proposed before, in AEgIS a dedicated experimental apparatus and several detection strategies have been studied in order to observe the first measurement ever on this interesting process. In this work we present and discuss the experimental findings about the successful Ps n = 3 excitation.
Moreover, in this thesis, a study of the impact of involved nonlinear processes on the
excitation efficiency of a Doppler broadened atomic cloud is carried out. Presented simulation
results show that, by exploiting properly nonlinear processes in the generation of the desired wavelength, it is possible to improve the excitation efficiency of a laser pulse. It is crucial, in AEgIS, the use of a periodically poled crystal in quasi phase matching regime. This gives a broadband continuous output spectrum whose wings survive to the spectral cutting of the last nonlinear crystal of the chain (which has insufficient spectral acceptance). This means that, at high laser energies, these wings can be amplified and the spectrum gaps can be filled in, leading to high reachable saturation efficiencies. On the contrary, in a laser pulse with a comb-shaped spectrum with a Gaussian envelope, both wings and gaps drop rapidly to zero, and amplification hardly occurs at usually employed energy regimes.
The presented model is finally used to fit AEgIS Ps n = 3 excitation experimental data.

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