25 November 2009 Laser beam collimation testing with defocus grating
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A novel method for testing the collimation of laser beam with defocus grating is presented. Defocus grating combined with lens of short focus length allows simultaneous imaging of two defocused spots in the ±1 diffraction order spot. When the well collimated beam passes through the defocus grating, the diameter of the ±1 diffraction order spot is equal to each other. The relationship between the collimation of the incident beam and diameters of the ±1 diffraction order spots are analyzed in detail. The position of the pinhole and pointing errors of the collimation system can be detected by the defocus grating. The feasibility of this method is verified experimentally on the collimation of the He-Ne laser. The method which has a simple data processing algorithm does not require any referencing or fringe analysis and can be implemented full-optically.
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Haotong Ma, Fengjie Xi, Pu Zhou, Xiaolin Wang, Yanxing Ma, Xiaojun Xu, Zejin Liu, "Laser beam collimation testing with defocus grating", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75060U (25 November 2009); doi: 10.1117/12.838072; https://doi.org/10.1117/12.838072

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