臺灣博碩士論文加值系統

紫外光波段之非線性光學的頻率轉換為本論文的研究主題，依照準相位匹配理論，我們設計出光參振盪及和頻週期，並利用高電壓極化反轉技術，製作週期性極化反轉鉭酸鋰(Periodically Poled Lithium Tantalite , PPLT)非線性轉換光參晶體。我們在0.5mm厚的鉭酸鋰晶體(Lithium tantalite, LiTaO3, LT)基板，製作長度L=20mm寬頻紅外光結構；並利用0.35mm厚的鉭酸鋰基板，製作總長度L=25mm級聯式光參-和頻紫外波長可調和頻結構。
在光學實驗量測中，寬頻紅外光參產生採用單週期準相位匹配結構，以532nm作為泵浦光源，在簡併點附近進行光參轉換。我們利用光參振盪器波長輸出隨晶體溫度調整之特性，產生1000~1200nm光源。當輸入693mW綠光，可轉換出231mW紅外光，此時產生之紅外頻寬約38nm，斜線效率達59.35%。
對於厚度0.35mm之級聯光參-和頻晶體，我們藉由調整晶體溫度而改變第三階準相位匹配之紫外光波長輸出。當綠光泵浦功率為688mw下，可產生功率為1.2mW的348nm波長紫外光，斜線效率0.37%。

This work is the study of quasi-phase matching (QPM) ultraviolet frequency up-conver¬sion using periodically poled lithium tantalite (PPLT). It is composed of two parts：(1) design, implementation and characterization of optical parametric oscillation (OPO) with a single period first-order QPM structure on 0.5mm thick 20mm long PPLT, and (2) design, implementation and characterization of first-order optical parametric oscillation (OPO) structure of 19mm length cascaded 6mm long 3rd QPM-sum frequency generation (SFG) in the ultraviolet spectral regime using 0.35mm thick PPLT.
First, the PPLT OPO sample was fabricated a QPM period of 7.63μm. The device was characterized with a 532nm green pump and operated near the degenerate point. By temperature tuning, the device exhibit a broad spectral tuning range from 980nm to 1160nm. With a 532nm pump power of 693mw, we obtain infraed output power of 231mw with a slope efficiency of 59.35% and spectral width of 38nm at the crystal temperature of 130 oC.
Next, we characterized a second sample with cascaded structures to generate broadband IR beam and tunable SFG of UV light. Device has the same QPM-OPO periodic 7.63μm of length 19mm and a third-order QPM-SFG periodics of 6.098μm, 6.1071μm, 6.122μm, 6.135μm and 6.149μm of total length 6mm. In SFG design,we design five different periodics in cascade which allows us to get a tunable source of UV laser by crystal temperature tuning. At a green pump power of 688mw, we obtained a maximum power of UV laser about 1.2mw at a wavelength of 348nm and crystal temperature of 138.9 oC.

目錄
目錄 i
附圖目錄 iv
附表目錄 vii
第一章 緒論 1
1.1 研究背景與動機 1
1.2 非線性晶體介紹 3
1.3 鉭酸鋰晶體介紹 5
1.3.1 基本特性 5
1.3.2 相變化 6
1.4 週期性區域極化反轉製作方式 7
第二章 非線性光學 頻率轉換理論 8
2.1 非線性頻率轉換 8
2.1.1 二倍頻的產生 10
2.2 一維準相位匹配理論 12
2.2.1 佔空比對一準相位匹配的影響 14
2.3 光學參量振盪器 16
2.3.1 傳統光參產生及準相位匹配光參產生 16
2.3.2 光參振盪器介紹 20
2.3.3 雙鏡光學共振腔 22
第三章 準相位匹配晶體設計與製程 27
3.1 光參晶體週期設計 27
3.2 和頻晶體週期設計 29
3.3 紫外光晶體設計 31
第四章 光學量測與分析 34
4.1 光學量測前置作業 34
4.1.1 晶體研磨和拋光 34
4.1.2 溫控系統製作 36
4.1.3 泵浦雷射 38
4.1.4 共振腔設計與模態匹配 41
4.2 光參振盪寬頻紅外產生器之量測與分析 44
4.2.1 實驗目的 44
4.2.2 實驗架構 44
4.2.3 實驗結果與分析 48
4.3 光參振盪紫外光產生器之量測與分析 52
4.3.1 實驗目的 52
4.3.2 實驗架構 52
4.3.3 實驗結果與分析 54
第五章 結論與未來展望 61
5.1 結論 61
5.2 未來展望 61
參考文獻 63

[1] 參考至:
http://zh.wikipedia.org/wiki/%E4%B8%89%E7%BB%B4%E6%89%93%E5%8D%B0
[2] Fabrice Devaux, Alexis Mosset, Eric Lantz, Serge Monneret, and Herve’ Le Gall, “Image upconversion from the visible to the UV domain:application to dynamic UV microstereolithography”, 190.7220, 220.4000, 350.5130
[3] T. H. Maiman, "Stimulated Optical Emission in Ruby," Journal of the Optical Society of America, Vol. 50, pp. 1134-1134, 1960.
[4] P. A. Franken, G. Weinreich, C. W. Peters, and A. E. Hill, "Generation of Optical Harmonics," Physical Review Letters, Vol. 7, pp. 118-119, 1961.
[5] J. A. Armstrong, N. Bloembergen, J. Ducuing, and P. S. Pershan, "Interactions between Light Waves in a Nonlinear Dielectric," Physical Review Letters, Vol. 127, pp. 1918-1939, 1962.
[6] M. M. Fejer, G. A. Mahel, D. H. Jundt, and R. L. Byer, "Quasi-phase-matched harmonic generation: tuning and tolerances", IEEE J. Quantum Electron., Vol. 28, pp. 2631-2654, 1992.
[7] D. Feng, N. B. Ming, J. F. Hong, Y. S. Zhu, Z. Yang, and Y. N., Wang, "Enhancement of second-harmonic generation in LiNbO3 crystals with periodic laminar ferroelectric domains ", Appl. Phys. Lett., Vol. 37, pp. 607, 1980.
[8] H. Ito, C. Takyu, and H. Inaba, "Fabrication of periodic domain grating in LiNbO3 by electron beam writing for application of nonlinear optical processes", Electron. Lett. , Vol. 27, pp. 1221, 1991.
[9] I. Camlibel, "Spontaneous polarization measurements in several ferroelectric oxides using a pulsed-field method", J. Appl. Phys., Vol. 40, pp. 1690, 1969.
[10] M. Yamada, N. Nada, M. Saitoh, and K. Watanabe, "First-order quasi-phase matched LiNbO3 waveguide periodical poled by applying an external field for efficient blue second harmonic generation", Appl. Phys. Lett., Vol. 62, pp. 435, 1993.
[11] A. Yariv, P. Yeh, “Optical Wave in Crystals, "John Wiley & Sons. Inc, New York, pp. 530, 1984.
[12] 徐維駿, “利用週期性極化反轉結構之光參數過程產生可調可見光與寬頻光源”, 國立交通大學光電工程學研究所碩士論文, 2009.
[13] S. E. Harris, “Tunable optical parameteric oscillators”, Proc. IEEE, vol. 57, pp. 2096-2113 (1969).
[14] R.L. Byer, “Optical parametric oscillators”, in Treatise in Quantum Electronics, H. Rabin and C. L. Tang, Eds. New York：Academic, pp. 587-702, 1973
[15] 祝志耀,”奈秒級光學參量振盪器應用於白光雷射產生器之研究”,國立台灣大學電機資訊學院光電工程學研究所碩士論文,2011.
[16] 呂百達, ”激光光學”, 第三版, 高等教育出版社, 2002.
[17] J.-P. Meyn and M. M. Fejer, "Tunable ultraviolet radiation by second-harmonic generation in periodically poled lithium tantalite," Optics Letters, Vol. 22, No. 16, 1997.
[18] Klaus Schneider and Stephen Schiller,” Multiple conversion and optical limiting in asubharmonic-pumped parametric oscillator” Optics Letters, Vol. 22, No. 6, 1997.
[19] N.A. Barboza ‧ R.S. Cudney,” Improved Sellmeier equation for congruently grown lithium
tantalate”, Applied Physics BVolume 95, Issue 3, pp 453-458, June 2009,