Simulation of Gaussian laser standing wave based on diffraction by straight edge

ZHANG Bao-wu; MA Yan; ZHANG Ping-ping; ZHI Li-xiang; LI Si-rong; ZHOU Jin-yu; CHEN Chen; GAO Yu-kun

doi:10.3969/j.issn.1001-3806.2012.06.024

In order to study effect of substrates on the focusing laser beam in atom lithograph,the characteristics of Gaussian laser standing wave affected by diffraction of straight edge were simulated based on the scalar optical theory.The results indicate that diffracted by the straight edge,Gaussian laser will show the similar oscillation of intensity to plane wave and the Gaussian incident wave has 1.18 times of the intensity of the central axis at the first mutation of intensity,while the plane is 1.37 times.The diffraction of the Gaussian laser by straight edge trends to that of plane wave when the waist becomes larger;the distance between laser axis and substrate will affect the illumination area of the laser outside the straight edge.The optical field superimposed by the diffracted Gaussian laser and its retro-reflective wave is the standing wave with oscillation of intensity outside the shaded area.All the results can make us well understand the essence of the Gaussian laser standing wave with diffraction by straight edge.

Simulation of Gaussian laser standing wave based on diffraction by straight edge

1. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China;

2. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, China

Received Date: 2012-03-30

Accepted Date: 2012-04-23

Available Online: 2012-11-25

Abstract: In order to study effect of substrates on the focusing laser beam in atom lithograph,the characteristics of Gaussian laser standing wave affected by diffraction of straight edge were simulated based on the scalar optical theory.The results indicate that diffracted by the straight edge,Gaussian laser will show the similar oscillation of intensity to plane wave and the Gaussian incident wave has 1.18 times of the intensity of the central axis at the first mutation of intensity,while the plane is 1.37 times.The diffraction of the Gaussian laser by straight edge trends to that of plane wave when the waist becomes larger;the distance between laser axis and substrate will affect the illumination area of the laser outside the straight edge.The optical field superimposed by the diffracted Gaussian laser and its retro-reflective wave is the standing wave with oscillation of intensity outside the shaded area.All the results can make us well understand the essence of the Gaussian laser standing wave with diffraction by straight edge.

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Reference (13)

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Simulation of Gaussian laser standing wave based on diffraction by straight edge

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