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A novel wavefront sensing technique for high speed atmospheric measurement based on digital micromirror device
Yang Ping; Wang Shuai; Ao Mingwu; Xu Bing
Volume8178
2011
Language英语
Indexed ByEi
Subtype会议论文
AbstractWe propose a novel wavefront sensing technique based on binary-aberration-mode filtering and detection. Rather than Zernike polynomials, the orthogonal binary two-dimensional Walsh functions are transferred to circular mode-fieldfitted Walsh functions and used as binary aberration modes to expand the wavefront. A Digital Micromirror Device (DMD) is employed as an intensity spatial light modulator (SLM). It generates each of the intensity modulation patterns prescribed by the mode-field-fitted Walsh functions to modulate the intensity of the incident beam before it is focused to impinge on a single-mode optical fiber. The single-mode optical fiber, as a spatial mode filter, supports only fundamental binary aberration mode. A detector collects the amount of the intensity after each modulation. By building the relationship with the intensity, the binary-aberration-mode coefficients can be calculated. This technique turns the complex two-dimensional wavefront sensing into simple intensity detection. Therefore, many limitations, such as low response frequency and weak far-infrared detection capability of most photosensor arrays can be easily eliminated just by adopting a photosensor such as a photodiode. Thus, this technique is especially suitable for weak and far-infrared light detection. The numerical simulation demonstrates that the wavefront reconstruction with the binary aberration modes is reliable and the technique can easily meet the demands of high speed atmospheric measurements and has a promising application in atmospheric fields.; We propose a novel wavefront sensing technique based on binary-aberration-mode filtering and detection. Rather than Zernike polynomials, the orthogonal binary two-dimensional Walsh functions are transferred to circular mode-fieldfitted Walsh functions and used as binary aberration modes to expand the wavefront. A Digital Micromirror Device (DMD) is employed as an intensity spatial light modulator (SLM). It generates each of the intensity modulation patterns prescribed by the mode-field-fitted Walsh functions to modulate the intensity of the incident beam before it is focused to impinge on a single-mode optical fiber. The single-mode optical fiber, as a spatial mode filter, supports only fundamental binary aberration mode. A detector collects the amount of the intensity after each modulation. By building the relationship with the intensity, the binary-aberration-mode coefficients can be calculated. This technique turns the complex two-dimensional wavefront sensing into simple intensity detection. Therefore, many limitations, such as low response frequency and weak far-infrared detection capability of most photosensor arrays can be easily eliminated just by adopting a photosensor such as a photodiode. Thus, this technique is especially suitable for weak and far-infrared light detection. The numerical simulation demonstrates that the wavefront reconstruction with the binary aberration modes is reliable and the technique can easily meet the demands of high speed atmospheric measurements and has a promising application in atmospheric fields.
Conference NameProceedings of SPIE - The International Society for Optical Engineering, v 8178, 2011, Optics in Atmospheric Propagation and Adaptive Systems XIV
Conference Date2011
Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7755
Collection自适应光学技术研究室(八室)
Corresponding AuthorYang Ping
Affiliation中国科学院光电技术研究所
Recommended Citation
GB/T 7714
Yang Ping,Wang Shuai,Ao Mingwu,et al. A novel wavefront sensing technique for high speed atmospheric measurement based on digital micromirror device[C],2011.
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