摘要
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 the second-order susceptibility created in the fused silica by thermal/electric field poling is analyzed in detail in this paper. It shows that the second-order susceptibility is established by both the orientations of dipoles and third-order susceptibility activated by strong static electric field in the depletion region of the sample. Under the ordinary poling condition the former is the main factor, whereas if with the greater poling voltage the latter is the key factor. The expression for calculating second-order susceptibility are deduced, and the numerical calculation is performed. The simulation results show, under the ordinary situation, X33(2) and X33(2):X31(2) that are about 1 pm/V and 3, respectively, which are quite consistent with the experimental reports. The theory proves that second-order susceptibility can be increased by improving the applied voltage and choosing the silica material with the greater concentration of Na and OH impurity.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2001年第7期595-598,共4页
Chinese Journal of Lasers
基金
江苏省自然科学基金 (编号 :BK970 12 )资助课题
