Laser beam scanning based on the Talbot phase-encoding method

Changhe Zhou; Peng Xi; Enwen Dai; Liren Liu; Huayi Ru

doi:10.1117/12.451627

15 November 2002 Laser beam scanning based on the Talbot phase-encoding method

Changhe Zhou, Peng Xi, Enwen Dai, Liren Liu, Huayi Ru

Proceedings Volume 4788, Photonic Devices and Algorithms for Computing IV; (2002) https://doi.org/10.1117/12.451627
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

Citation Download Citation

Changhe Zhou, Peng Xi, Enwen Dai, Liren Liu, and 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); https://doi.org/10.1117/12.451627

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KEYWORDS

Diffraction

Optical scanning

Scanners

Microlens array

Computer programming

Nonimpact printing

Glasses

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