摘要
高精度KDP晶体是惯性约束核聚变光路系统中的重要元件,而已加工表面的小尺度波纹对光学元件的透射比有着重要影响。采用傅里叶模方法理论分析了表面小尺度波纹的幅值及周期对KDP光学元件透射比的影响。研究结果表明,当小尺度波纹幅值小于100 nm时,透射比随波纹幅值的增加基本呈线性增长,波纹幅值每提高10 nm.透射比可提高近0.5%;透射比随着小尺度波纹周期的增加围绕中心透射比上下浮动,透射比振幅基本保持不变.且中心透射比及透射比振幅均随着小尺度波纹幅值的增加而增大;小尺度波纹周期在10.5～12μm区间内时透射比明显很低,需采取措施避免小尺度波纹的周期出现在此区间。对KDP晶体进行了加工、表面形貌检测及透射比检测的实验,实验结果与理论计算结果基本吻合。
High-precision KDP optical element is a key component in ICF optical system.The micro-waveness on the machined KDP surface has a significant impact on its transmittance.The effect of micro-waveness amplitude and period on the transmittance of KDP optical element is discussed by Fourier modal theory.Results indicate that：the transmittance increases linearly as the micro-waveness amplitude grows（about 0.5%per 10 nm） when the microwaveness amplitude is less than 100 nm;the transmittance varies around the central value while the transmittance amplitude remains unchanged,and both of them increase as the micro-waveness amplitude grows.The transmittance is very low when micro-waveness period is between 10.5μm and 12μm,and measures should be taken to avoid micro-waveness period in such range.Processing,detection experiments of morphological surface and transmittance of KDP crystal are carried out,and the experimental results are consistent with the theoretical calculations basically.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第4期1162-1167,共6页
Acta Optica Sinica
基金
国家自然科学基金(50875066)
国家863计划(2009AA044305)资助课题
