摘要
利用径向剪切干涉法检测高功率激光波前时,由于探测器CCD非线性效应,在频谱中引入了除基频外的二级、三级等高次频谱分量,增加了频谱混叠的可能,使得对有用信息提取困难,降低了波前检测精度。从理论上分析了CCD非线性效应产生高次频谱分量和导致频谱混叠的原因,给出非线性条件下避免频谱混叠的条件,提出了通过提高空间载频的方法来减小或消除CCD非线性效应导致的频谱混叠。计算机模拟和实验结果表明,该方法能够有效抑制频谱混叠并显著提高波前检测精度。
When radial shear interferometer is used in high-power laser wavefront detection,due to the influence of the nonlinearity of CCD,there exist not only the first order frequency with wave-front information but also the second and the third order frequency.They may lead to overlapping spectrum,which makes it difficult to extract useful information and reduces the detection accuracy of wavefront.A theoretical analysis on mechanisms of high-order spectral component and spectrum aliasing caused by the nonlinearity of CCD is established,and the condition to avoid spectrum aliasing is pointed out.Finally,a method by increasing the spatial carrier frequency to reduce or eliminate the spectrum aliasing is proposed.Computer simulation and experimental results have verified the feasibility of the method.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第8期1775-1779,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(60890203
10676023)
固体激光国家级重点实验室基金项目
关键词
径向剪切干涉
CCD非线性
傅里叶变换
频谱混叠
空间载频
radial shearing interferometry
nonlinearity of CCD
Fourier transformation
frequency overlapping
spatial carrier frequency
