模式偏置波前传感器理论模拟及实验验证
Theoretical simulation and experimental validation of mode-biased wavefront sensor
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摘要: 将模式偏置法与全息多重存储法波前传感器原理联系起来，通过研究模式偏置波前传感器的输出响应特性，间接得到全息模式波前传感器的运行规律。对模式偏置波前传感器进行理论分析与总结，并建立简化模型，针对若干阶Zernike像差，通过数值模拟对理论结果进行验证。模拟结果显示：传感器输出信号与各种类型待测像差系数有不同的变化关系，这与理论分析结果吻合。以散焦模式像差为例，利用两个相位型空间光调制器动态加载模式像差，分别在入射光波中引入待测像差和偏置像差，探测焦平面光斑强度变化。实验结果表明：以峰值光强作为焦平面光强分布的信息提取方式，进而得到正负偏置光斑的光强差和归一化光强差，这比在小孔光阑上进行积分更简单有效。Abstract: Operation principle of holographic modal wavefront sensor was obtained indirectly by investigating the output response characteristics of the mode-biased wavefront sensor and by associating the holographic multiplexing method with mode-biased one. The theoretical analyses and summaries on the mode-biased wavefront sensor resulted in the construction of simplified model, and verification to theoretical results was achieved by numerical simulation for several Zernike aberrations. The numerical simulation shows that, output signals of the sensor have different relationships with the amplitude of different types of tested aberrations, which is consistent with theory. To detect the spots intensity in the focal plane, the tested and biased aberrations, for instance the defocus mode, were dynamic
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