15 November 2002 Laser beam scanning based on the Talbot phase-encoding method
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Abstract
Laser beam scanning has wide applications in laser printer, laser tracking, etc.. The previous phase coding method is the micro-lens array method, which is difficult to fabricate because of the extreme fine linewidth at the outer part of the array lens. We propose a new scanning method based on the Talbot phase coding method. The Talbot phase codes come from the natural phase codes of the self-imaging effect of a grating for array illumination. A pair of two complementary Talbot encoded phase plates is used to replace the previous micro-lens array. Compared with the previous microlens array method, this method overcomes the shortcoming of the extreme fine linewidth of the previous method by replacing the equal linewidth of the encoded phases. This method overcomes the shortcoming of the continuous phase levels requirement of the previous method by using a limited phase-level number. This method overcomes the shortcoming of the continuous movement of the previous method by taking the equal-step movement. Therefore, our design of Talbot encoded scanner is more easily fabricated with binary optics and more reliable in practical use.
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Changhe Zhou, Peng Xi, Enwen Dai, Liren Liu, Huayi Ru, "Laser beam scanning based on the Talbot phase-encoding method", Proc. SPIE 4788, Photonic Devices and Algorithms for Computing IV, (15 November 2002); doi: 10.1117/12.451627; https://doi.org/10.1117/12.451627
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