|Abstract: ||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。;We constructed an 885 nm frequency stabilized diode laser system. We locked the 885 nm laser to Cs atom 6S1/2 F=3 to 6D 3/2 F=5 transition and scanned the frequency of carrier of the diode laser to obtain the hyperfine structure of 6D3/2. Similarly, we locked the 885 nm laser frequency to Cs atom 6S 1/2 F=4 to 6D3/2 F=3 transition and scanned the frequency of carrier of the diode laser to obtain hyperfine structure of |
6D3/2. In the end, we deduced that the hyperfine coupling constant via the measuring of 6D3/2 hyperfine interval.
In this work, for the hyperfine interval of 6S1/2 F=3 to 6D 3/2 F=2 to 5 that we measured were 81.767(29) MHz, 65.315(19) MHz and 49.148(23) MHz. The hyperfine coupling constants A and B that we deduced were 16.346(2) and 0.058(17). Similarly, the hyperfine interval of 6S1/2 F=4 to 6D3/2 F=2 to 5 that we measured were 81.763(17) MHz, 65.320(19) MHz and 49.149(3) MHz. The hyperfine coupling constants A and B that we deduced were 16.331(3) and 0.067(16) Other purposes of this work are to provide a frequency reference for Ti-Sapphire laser. In the past, our lab made a self-reference comb laser by referring to a Cs clock. In this work, we constructed a stabler frequency
comb laser by directly referring the mode-locked laser to a cesium atom two-photon transition at 822 nm and 885 nm.