摘要
针对检测实验获得最佳对比度干涉条纹,通过理论计算给出了条纹对比度与球面计算全息图(CGH)占空比的函数关系。以Cr玻璃的球面CGH检测大口径凸面镜为例,计算了对比度最大时球面CGH的占空比,用激光直写技术制作了占空比为0.2的球面CGH。实验结果分析表明,干涉条纹的对比度与理论计算相符。
Duty cycle of curved computer-generated hologram (CGH) was calculated for obtaining an optimal contrast of the interference fringe pattern in testing large aperture convex aspherical surface. The relation between the contrasts of the interference fringe pattern and duty-cycle was presented. Calculating duty cycle of curved CGH was described in testing a large convex mirror with Cr-glass CGH on curved surface. A curved CGH with duty cycle 0.2 was fabricated by using laser writing lithographic techniques. Analysis of experimental results shows the theoretical calculation agrees with experimental results at the contrast of the interference fringe pattern.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2005年第7期862-865,共4页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(60078006)
关键词
衍射光学
球面计算全息图(CGH)
占空比
条纹对比度
Aspherics
Holograms
Light measurement
Mirrors
Moire fringes
Surface measurement
Surface testing
