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研究生:吳雋元
研究生(外文):Jyuan-Yuan Wu
論文名稱:光學調變不穩定性的規則點陣形成
論文名稱(外文):Optical Pattern Transitions from Modulation to regular dot in Photorefractive Crystals
指導教授:鄭建宗
口試委員:李瑞光林元堯
口試日期:2015-07-25
學位類別:碩士
校院名稱:國立中興大學
系所名稱:物理學系所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2015
畢業學年度:103
語文別:中文
論文頁數:37
中文關鍵詞:調製不穩定非線性光學飽和型非線性晶體規則點陣光孤子
外文關鍵詞:modulation instabilitynonlinear opticsregular dotoptical soliton
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   本實驗主要探討飽和型非線性晶體(SBN-60)的光調制不穩定性現象(optical modulation instability ,MI)。經由調控背景光強來增加MI規則度,探討光調制不穩定性的圖形從無明顯圖形至光紊流圖形(optical turbulence)的演變。
在點狀演變至光紊流圖形過程中,點狀圖形會由光點分裂成更細小的點,並形成群體,在前人的研究中我們歸納以下可能產生規則圖形的條件為低光強、低電壓、低同調性。
由於背景光會抑制MI,在變化背景光強度的實驗中,我們發現藉由足夠強的背景光和電壓會有新的空間頻率分布的條紋產生使MI出現規則分布的情形,新條紋的產生條件會隨著背景光強上升而所需電壓下降,而點陣圖形產生條件會隨著背景光強上升而所需電壓上升,當點陣區間與新條紋重疊我們可以看到規則排列的點陣。

This experiment presents the research on optical modulation instability (MI) in SBN-60. We study the transition of optical MI patterns from the no feature to the optical turbulence patterns through increasing the regularity of MI by controlling the intensity of background light. In the transition from the dot patterns to the optical turbulence patterns, we found that dot patterns could split from one dot into more smaller dot, and these small dot could further cluster together. According to previous studies, we suggest that low intensity, low voltage and low coherence of light are the condition to form the regular patterns. MI could be inhibited by background light, and we found that new stripes of spatial frequency distribution, are formed by enough strength background light and voltage, could make MI distribution more regular. In the forming condition of new stripes, the voltage is decreased with an increased background light. In the forming condition of dot patterns, the voltage is increased with an increased background light. The regularly arranged dot patterns are showed when the regular dot intervals overlap with new stripes.

摘要........................................1
Abstract....................................2
緒論........................................4
1-1、光調制不穩定性..........................6
1-2、光折變晶體..............................9
1-3、同調光的MI圖形演變......................12
1-4、光的同調性對MI圖形影響...................14
1-5、訊號光對MI圖形的抑制.....................17
第二章、實驗方法與裝置........................19
第三章、結果與定性分析........................22
3-1、MI圖形的演變............................22
3-2、背景光影響條狀和點陣的電壓條件............25
3-3、新的直條紋產生..........................30
第四章、總結.................................35
第五章、參考文獻.............................36

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[8] Ming-Feng Shih, “Photorefractive Screening Solitons, Their Induced Waveguides and Interactions”, (Ph.D. diss., Princeton University, 1998)

[9]Chien-Chung Jeng, Optical Modulation Instability and Vortex Solitons in Noninstantaneous Nonlinear Media(2004)

[10]C.C.Jeng, Y.Y.Lin, R.C. Hong, and R. K. Lee, Phys. Rev. Lett.102,153905(2009)

[11]Kip, Detlef, et al. "Modulation instability and pattern formation in spatially incoherent light beams." Science 290.5491 (2000): 495-498.


[12]T.S. Ku, M.F. Shih, Andrey A. Sukhorukov, and Yuri S. Kivshar,Phys. Rev. Lett. 94, 063904(2005)

[13]Ming-Feng Shih, Chien-Chung Jeng, Fan-Wen Sheu, and Chao-Yin Lin, Phys. Rev. Lett. 88, 133902(2002)

[14]Jeng, Chien-Chung, et al. "Control modulation instability in photorefractive crystals by the intensity ratio of background to signal fields." Optics express 23.8 (2015): 10266-10271.


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