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详细分析了熔融石英样品经热及电场诱导后 ,建立二阶极化率的机理。该机理表明 ,二阶极化率是由样品耗尽区中偶极子的定向和三阶极化率经强静电场作用共同形成的。在一般条件下诱导 ,前者是主要因素 ;在较高电压诱导时 ,后者是主要因素。推导了二阶极化率的表达式 ,并进行了数值计算。数值结果表明 ,在一般情况下 ,χ3 3 ( 2 ) 约 1pm/V ,χ3 3 ( 2 ) ∶χ3 1( 2 ) 约为 3。理论证明提高诱导的外加电压和选用Na和OH杂质浓度较大的石英材料能提高二阶极化率。
The mechanism of establishing second-order polarizability was analyzed in detail after fused silica samples were induced by heat and electric field. The mechanism shows that the second-order polarizability is formed by the dipole orientation in the depletion region and the third-order polarizability by the strong electrostatic field. Under the general conditions of induction, the former is the main factor; the latter is the main factor at higher voltage induction. The second-order polarizability expression is deduced and numerical calculation is carried out. The numerical results show that in general, χ3 3 (2) is about 1 pm / V and χ3 3 (2): χ3 1 (2) is about 3. It has been proved theoretically that increasing the induced voltage and selecting quartz materials with larger Na and OH impurity concentrations can improve the second-order polarizability.