研究生: |
劉子維 |
---|---|
論文名稱: |
銫原子氣室溫度與銫原子位置對6S-->8S雙光子超精細躍遷之影響 |
指導教授: |
劉祥麟
Liu, Hsiang-Lin 鄭王曜 Cheng, Wang-Yau |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 51 |
中文關鍵詞: | 銫原子 、雙光子 、6S-8S 、譜線頻移 、譜線增寬 |
論文種類: | 學術論文 |
相關次數: | 點閱:61 下載:61 |
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原子受到碰撞時會影響其能階,使得電子躍遷譜線的中心頻率以及線寬發生改變。就我們所知,目前文獻上所記載的都是觀察原子氣體不同氣壓對譜線所造成的影響,而本論文則是分別控制原子氣室溫度以及指型冷凝部位溫度,想藉此觀察改變氣室溫度跟改變原子蒸氣壓是否會對譜線造成不一樣的影響。
在本論文的實驗裡,我們觀測的是銫原子6S-8S超精細結構雙光子躍遷的「譜線頻移」以及「譜線增寬」現象。為了量測這微小的變化,我們自製了一台頻率穩定度小於2 kHz的穩頻外腔式半導體雷射。從我們的實驗數據中發現:當原子氣室溫度固定,指型冷凝部位溫度上升時,躍遷中心頻率有紅移現象,譜線增寬;若指型冷凝部位溫度固定,讓原子氣室溫度上升,則躍遷中心頻率是藍移現象,譜線同樣是增寬。
除此之外,我們也做了入射光離器壁不同距離對躍遷中心頻率影響的實驗,我們發現入射光離器壁愈近,躍遷中心頻率愈高。我們嘗試利用銫原子電偶極矩以及感應電偶極矩之間的作用來解釋實驗中觀察到的現象,但是實驗結果跟我們理論預測的不符,因此尋找這個現象的原因便成了未來實驗的目標之一。
[1] C. Y. Cheng, C. M. Wu, G. B. Liao and W. Y. Cheng, “Cesium 6S1/2 – 8S1/2 two-photon-transition-stabilized 822.5nm diode laser”, Opt. Lett. 32, 563 (2007)
[2] Sir Harrie Massey, “Atomic and molecular collisions”, Taylor&Francis LTD, London, 1979
[3] Nicole Allard and John Keilkopf, “The effect of neutral nonresonant collisions on atomic spectral lines”, Rev. Mod. Phys. 54, 1103 (1982)
[4] M. Marinescu, H. R. Sadeghpour and A. Dalgarno, “Dispersion cofficients for alkali-metal dimers”, PR A, 49, 982 (1994)
[5] Chris H. Greene, Edward L. Hamilton, Heather Crowell, Cedomil Vadla, Kay Niemax, “Experimental Verification of Minima in Excited Long-Range Rydberg States of Rb2”, PRL 97, 233002 (2006)
[6] D. A. Steck, “Cs D Line Data”, Los Alamos National Laboratory (unpublished), (2003)
[7] K.L. Soohoo, C. Freed, J. E. Thomas and H. A. Haus, “Anomalous Saturated-Absorption Pressure Shifts in CO2”, Phys. Rev. Lett. 53, 1437 (1984)
[8] M. S. Feld and V. S. Letokhov, “Topics in Current Physics”, Springer, Berlin, 1980, Ch. 4.2.4
[9] F. Biraben, B. Cagnac and G. Grynberg, ” Doppler-free two-photon spectroscopy of neon”, J. Phys. (Paris) 36, L41 (1975)
[10] F Biraben , B Cagnac , E Giacobino and G Grynberg, “Broadening and shift of the sodium 3S-4D and 3S-5S two-photon lines perturbed by noble gases”, J. Phys. B, 10 2369(1977)
[11] G. Hagel, C. Nesi, L. Jozefowski, C. Schwob, F. Nez and F. Biraben, ”Accurate measurement of the frequency of the 6S-8S two-photon transitions in cesium”, Opt. Comm. 160, 1-4 (1999)
[12] M. S. Feld and V. S. Letokhov “Coherent Nonlinear Optics”, Springer, Berlin, 1980, Ch4.3.4
[13] Wolfgang Demtröder, “Laser Spectroscopy”, Springer, Berlin, 2nd ed, 1996, Ch 3.3
[14] H. M. Foley, “The Pressure Broadening of Spectral Lines”, Phys. Rev. 69, 616 (1946)
[15] Alan Corney, “Atomic and Laser Spectroscopy”, Clarendon Press, Oxford, 1977, Ch 17.4.2
[16] Fouad G. Major, ”The quantum beat: principles and applications of atomic clocks”, Springer, Berlin, 2nd ed, 2007, Ch 11.6
[17] Harald Eriendrich, ”Theoretical Atomic Physics”, Springer, Berlin, 3nd ed, 2005, Ch 5.5.1
[18] J.D.Jackson, “Classical Electrodynamics”, 2nd ed, 1975, p.143
[19] C. J Hawthom, K. P. Weber, and R.E. Scholten ,”Littrow Configuration tunable external cavity diode laser with ifxed direction output beam.”, Rev. Sci. Instrum. 72 4477(2001)
[20] E. A. Donley, T. P. Heavner, F. Levi, M. O. Tataw, and S. R. Jefferts, “Double-pass acousto-optic modulator system”, Rev. Sci. Instrum. 76, 063112 (2005)
[21] Chih-Hao Chang, R. K. Heilmann, M. L. Schattenburg, and P. Glenn, “Design of a double-pass shear mode acousto-optic modulator”, Rev. Sci. Instrum. 79, 033104 (2008)
[22] Alan Corney, “Atomic and Laser Spectroscopy”, Clarendon Press, Oxford, 1977, Ch 18.3.3