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Jisuan wuli

超精细能级中133Cs激发态|62P3/2F〉（F=2,3,4,5）原子与理想金属表面间范德瓦尔斯作用系数C3的估算

魏奶萍, 赵小侠, Li Li, Zhang Peng, 李院院, 徐可为

Published Jan 1, 2016• 0 citations
OpenAlex

Abstract

利用碱金属原子与理想金属表面间范德瓦尔斯（vd W）作用势和不可约张量方法,计算133Cs激发态|62P3/2F〉（F=2,3,4,5）原子超精细结构的C3系数.数值分别为:4.338 5 k Hz·μm3、4.361 9 k Hz·μm3、4.368 0及4.346 7 k Hz·μm3.与其它理论数据和实验数据比较,结果表明本文所得到的133Cs激发态|62P3/2F〉（F=2,3,4,5）原子的C3数值是可靠的.

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銫原子 6S-6D 雙光子超精細耦合常數

廖文聖

我們建立了一套 885 nm 穩頻雷射系統，透過電光調製器光纖，將雷射鎖在銫原子6S1/2 F=3到6D3/2 F=5的交叉譜線上，掃描銫原子6S1/2 F=4 到6D3/2 F=2,3,4,5的躍遷;同樣地，我們將雷射鎖在銫原子6S1/2 F=4 到6D3/2 F=3的交叉譜線上，掃描銫原子6S1/2 F=3到6D3/2 F=2,3,4,5的躍遷，藉此便可得到銫原子6D 3/2的超精細結構。此次我們所量得的 6S 1/2 F=3 到6D 3/2 F=2,3,4,5的躍遷間距分別為，81.767(29) MHz、65.315(19) MHz、49.148(23) MHz，其超精細耦合常數 A 與 B 分別為 16.346(2)、0.058(17)；S 1/2 F=4 到6D3/2 F=2,3,4,5的躍遷間距分別為， 81.763(17) MHz、65.320(19) MHz、49.149(3) MHz，其超精細耦合常數 A 與 B 分別為 16.331(3)、0.067(16)。 建立 885 nm 穩頻雷射的另一個目的是為了作為光梳雷射的參考頻率，透過我們實驗室的 822 nm 穩頻雷射，與此次我們所建立的885 nm 穩頻雷射，便可回授控制鈦藍寶石雷射的腔長，鎖住脈衝重覆率，以及回授控制AOM，鎖住鈦藍寶石雷射的偏移頻率，便可得到一穩定之光梳雷射。將頻率鎖在銫原子6S-8S躍遷(822 nm)與6S-6D躍遷(885 nm)的光梳頻雷射，其短期頻率穩定度優於以銫原子鐘做為參考的自參考光梳雷射。

•Jul 27, 2015•0 citations
利用碱金属原子与理想金属表面间范德瓦尔斯（vd W）作用势和不可约张量方法,计算133Cs激发态|62P3/2F〉（F=2,3,4,5）原子超精细结构的C3系数.数值分别为:4.338 5 k Hz·μm3、4.361 9 k Hz·μm3、4.368 0及4.346 7 k Hz·μm3.与其它理论数据和实验数据比较,结果表明本文所得到的133Cs激发态|62P3/2F〉（F=2,3,4,5）原子的C3数值是可靠的.
基于铯原子133Cs 6S1/2→6P3/2→6D5/2 （852 nm+917 nm）阶梯形能级系统，演示了一种经荧光探测获得原子激发态超精细能级之间跃迁信号的光谱（AESVFD）技术：在852 nm、917 nm两波长激光级联激发下，将铯原子由基态6S1/2布居到激发态6D5/2上，而后原子经7P3/2→6S1/2跃迁通道自发辐射出456 nm荧光，对此荧光探测获得了激发态6P3/2F′=5→ 6D5/2F″=6超精细能级跃迁的光谱信号。比较了852 nm与917 nm激光束同向、反向传播作用于铯原子时的AESVFD信号差异，发现反向实验构型下的AESVFD信号较同向构型的信噪比明显要高且线宽更窄。实验上系统测量了AESVFD对原子气室温度、泵浦光偏振、功率及频率失谐的依赖关系，分析了窄线宽、高信噪比AESVFD信号获得的实验条件，所得最窄AESVFD信号的线宽小于5.0 MHz，接近于激发态6P3/2的自然线宽5.2 MHz。精密光谱的测量对原子能级结构的探索、原子理论模型的检验等具有重要的意义。
Active optical frequency standard based on narrow bandwidth Faraday atomic filter is proposed. The output laser power achieved to 42 µW. The laser frequency is determined by narrow bandwidth Faraday atomic filter, corresponding to the Cs 62S1/2F=4 to 62P3/2F′=4, 5 crossover transition line. The transmission of the Faraday atomic filter is 23% and the bandwidth is 52.6MHz. Considering the loss in the cavity, the linewidth of the cavity mode is 345.1MHz. The bad cavity coefficient is 6.6. Working in the bad cavity scheme, the output laser signal of active Faraday optical frequency standard is insensitive to the cavity vibration and thermal noise. Besides, we redesign an integrated structure to decrease the influence of the environmental vibration. With more steady structure, hundreds of millihertz level of the active Faraday optical frequency linewidth is expected.
The dependence of Cs saturated absorption spectra on the intensity of pumping light, especially that of the spectrum of ６２Ｓ１／２Ｆ＝４→６２Ｐ３／２Ｆ′＝５, was measured and calculated. When the pumping light and probing light were linearly polarized, the relative magnitudes of the resonance signals were calculated by solving a set of rate equations with Runge-Kutta algorithm, taking into consideration the optical pumping process and the saturation in the Zee-man sublevels of the hyperfine structure. The theoretical calculations were in good agreement with the experimental results.
我們建立了一套 885 nm 穩頻雷射系統，透過電光調製器光纖，將雷射鎖在銫原子6S1/2 F=3到6D3/2 F=5的交叉譜線上，掃描銫原子6S1/2 F=4 到6D3/2 F=2,3,4,5的躍遷;同樣地，我們將雷射鎖在銫原子6S1/2 F=4 到6D3/2 F=3的交叉譜線上，掃描銫原子6S1/2 F=3到6D3/2 F=2,3,4,5的躍遷，藉此便可得到銫原子6D 3/2的超精細結構。此次我們所量得的 6S 1/2 F=3 到6D 3/2 F=2,3,4,5的躍遷間距分別為，81.767(29) MHz、65.315(19) MHz、49.148(23) MHz，其超精細耦合常數 A 與 B 分別為 16.346(2)、0.058(17)；S 1/2 F=4 到6D3/2 F=2,3,4,5的躍遷間距分別為， 81.763(17) MHz、65.320(19) MHz、49.149(3) MHz，其超精細耦合常數 A 與 B 分別為 16.331(3)、0.067(16)。 建立 885 nm 穩頻雷射的另一個目的是為了作為光梳雷射的參考頻率，透過我們實驗室的 822 nm 穩頻雷射，與此次我們所建立的885 nm 穩頻雷射，便可回授控制鈦藍寶石雷射的腔長，鎖住脈衝重覆率，以及回授控制AOM，鎖住鈦藍寶石雷射的偏移頻率，便可得到一穩定之光梳雷射。將頻率鎖在銫原子6S-8S躍遷(822 nm)與6S-6D躍遷(885 nm)的光梳頻雷射，其短期頻率穩定度優於以銫原子鐘做為參考的自參考光梳雷射。