基于湍流模型的自适应光学系统响应矩阵测量方法

Measurement method of response matrix for adaptive optics systems based on turbulence model

为了提高液晶自适应光学系统的校正精度,提出一种基于湍流模型的响应矩阵测量方法。该方法施加到液晶波前校正器上的波面是用来拟合待测像差的Karhunen-Loeve模式的线性组合,其模式系数分布服从Kolmogorov大气湍流模型。相比于传统的单模式和多模式响应矩阵测量方法,该方法具有更强的抗噪声干扰能力,能够显著提高响应矩阵测量精度。在信噪比为10的情况下,当重复率分别为1、5和10时,采用传统单模式法和多模式法获得的响应矩阵进行自适应校正后的斯特列耳比分别为0.06、0.02、0.49和0.23、0.40、0.67,而采用该方法可以达到0.34、0.56、0.68。

In order to improve the correction accuracy of liquid crystal （LC） adaptive optical systems, a method based on turbulence mode posed. The wavefronts applied to the LC eve modes which are used to fit the measu 1 for measuring the interaction matrix （IM） was procorrector are the linear combination of Karhunen-Lo- red aberrations and the coefficients of these modes obey the Kolmogorov atmospheric turbulence model. Comparing with traditional single mode and multiple modes method, the new method has a stronger anti-noise ability and can produce a significant improvement on IM measurement. Under the condition of the signal-to-noise ratio （SNR） of 10, when the repetition rate is1,5 and 10, respectively,the corresponding Strehl ratio 06, 0.02,0. 49 and 0.23,0. 40, 0. 67, corrected by using the IM obtained with the tradionngle mode method and multi-mode method, respectivily, while that of the new method can reach 0. 34,0. 56,0. 68.