用光谱分辨的双光束耦合方法测量χ^((2)):χ^((2))级联非线性相移  

χ^((2)) :χ^( (2)) Cascaded Nonlinearity Measurements by Spectrally Resolved Two-Beam Coupling

作　　者：詹庭宇[1] 朱宝强[1] 顾震[1] 钱列加[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《光学学报》2001年第4期397-399,共3页Acta Optica Sinica

基　　金：国家自然科学基金! (6 0 0 880 0 3);国家 973!(G19990 75 2 0 2 3);国家 86 3高技术! (4 16 5 1)资助项目

摘　　要：针对重要的 χ( 2 ) :χ( 2 ) 级联非线性相移 ,在理论上论证了可以用光谱分辨的双光束耦合方法来测量 χ( 2 ) :χ( 2 ) 级联非线性相移 ,在实验上研究了飞秒时域级联非线性相移随波矢失配量的变化规律。这一新颖的测量方法灵敏度高、实际使用简单 ,应用低能量的飞秒激光振荡器 ,就能方便地测量微弱 χ( 2 ) 晶体的级联非线性相移。Aimed for the applications of χ (2) :χ (2) cascaded second-order nonlinear phase shifts, it is theoretically proved that this nonlinear phase shifts can be measured by spectrally resolved two-beam coupling. The dependence of the cascaded nonlinear phase shifts on the phase mismatching in femtosecond time scald is investigated experimently. The proposed novel approach has advantages of high sensitivity and easy to be applied. The cascaded nonlinearities of weak χ (2) crystals can be measured easily by use of low energy femotosecond laser oscillators.

关 键 词：级联非线性相移 双光束耦合 倍频 测量 光谱分辨 测量方法 激光振荡器 线性光学 光学晶体 

分 类 号：O734.1[理学—晶体学] TN753.92[电子电信—电路与系统]