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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65235

    Title: 非週期性晶疇極化反轉鈮酸鋰作為雙波長電光布拉格雷射Q調制器之研究;Aperiodically Poled Lithium Niobate as Electro-Optical Bragg Q-switch in Dual Wavelength Laser
    Authors: 黃尚昇;Huang,Shang-Sheng
    Contributors: 光電科學與工程學系
    Keywords: 非週期性晶疇極化反轉鈮酸鋰;APPLN
    Date: 2014-08-15
    Issue Date: 2014-10-15 14:44:22 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 橘黃光脈衝雷射,可應用天文觀測和醫療領域。在實驗上利用非週期性晶疇極化反轉鈮酸鋰同時Q調制1064nm雷射和1342nm雷射並利用BiBO晶體和頻產生橘黃光脈衝雷射。以模擬退火法演算法,計算可滿足1064nm和1342nm雷射繞射條件的非週期性結構。入射光的光束大小、非週期性結構的面積…等,皆會影響繞射效率。然而,非週期性晶疇極化反轉鈮酸鋰在結構中的模態耦合方程式複雜,尚未有理論發表,因此先以實驗作為佐證
    ;Yellow-orange pulsed lasers are required for astronomic observation and medical applications. We have succeed design and manufacture aperiodically poled lithium niobate(APPLN) as EO Bragg Q switching in Nd:YVO4 dual wavelength sum frequency generate Orange-Yellow pulse laser.
    In this letter, we design APPLN by aperiodic optical superlattice technique and simulated annealing method. Beam spot size of incident light, aperiodically structure area and other reason effect diffraction efficiency. However, the coupled mode theory in APPLN is complicated, so the theory haven’t been publish.
    The beam spot size of the incident light is about 300μm, we design two device. The first device which width is 920μm design for incident light and diffraction light, and the second device which width is 560μm design for incident light only. Both length is 3cm and thickness is 500μm.
    We can measure different diffraction efficiency with different incident light position. When the incident light input the device’s middle position of the width dimension, we get the highest diffraction efficiency at the first device. Then we put the first device into laser cavity. Under the optimum cavity-length condition, the highest Orange-Yellow pulse laser peak power is 270W, pulse width is 9ns, obtained at 5.8W of absorption pump power.
    Appears in Collections:[光電科學研究所] 博碩士論文

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