• 作者： 張冀青
• 作者服務機構： 國立中正理工學院應用物理學系
• 中文摘要： 本文我們在實驗上提出一互泵式相位共軛的新幾何架構，“弓狀”，於光折變鈦酸鋇晶體中。在此互泵式相位共軛器中兩相互非同調光分別與晶體+C軸方向夾鈍角，並分別從晶體的α面相對入射至晶體。此時在晶體內由入射光所產生的扇形光擁有較大的重疊區而導致較有效的相互作用的形成，同時亦無因內反射所造成的Fresnel損失。我們稱此相位共軛器為弓狀互泵式相位共軛器，簡稱Arch-MPPC。從實驗結果得知，在弓狀互泵式相位共軛器中入射光的空間動態行為與Zozulya等人在最近所提出的理論預測結果相吻合。文中亦探討本相位共軛器之角度的與位移的容忍度，以及兩入射光間的強度比對相位共軛光的反射率的影響。最後，我們針對本互泵式相位共軛器提出可能的物理模式。
• 英文摘要： A novel mutually pumped phase conjugation geometry, which induces an arch configuration, inphotorefractive barium titanate crystals is experimentally demonstrated. Both of the mutually incoherentbeams incident on opposite a faces of a crystal make obtuse angles to the crystal +C axis,respectively. This leads to effective mutual interaction as two fans emanating from the input beams havea large region of overlap and do not suffer from Fresnel losses due to internal reflection. We refer tothis phase conjugator as the“arch of mutually pumped phase conjugator (Arch-MPPC)”. This novel MPPCexhibits phase conjugation with zero internal reflection. We also show good concordance of spatial beambehaviour between the experimental results and the recent theoretical predictions proposed by A. A.Zozulya. The temporal response, the positional and angular acceptance, and the variations of the phase-conjugate reflectivity with the input beam intensity ratio have also been determined. Finally, a possiblephysical model is proposed.
• 中文關鍵字： photorefractive; BaTiO3; phase conjugation; mutually pumped phase conjugator; arch configuration
• 英文關鍵字： --