Determination of beam incidence conditions based on the analysis of laser interference patterns
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Affiliation
Changchun University of Science and TechnologyUniversity of Bedfordshire
Jiaotong-Liverpool University
Tampere University of Technology
Issue Date
2015-07-17
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Beam incidence conditions in the formation of two-, three- and four-beam laser interference patterns are presented and studied in this paper. In a laser interference lithography (LIL) process, it is of importance to determine and control beam incidence conditions based on the analysis of laser interference patterns for system calibration as any slight change of incident angles or intensities of beams will introduce significant variations of periods and contrasts of interference patterns. In this work, interference patterns were captured by a He-Ne laser interference system under different incidence conditions, the pattern period measurement was achieved by cross-correlation with, and the pattern contrast was calculated by image processing. Subsequently, the incident angles and intensities of beams were determined based on the analysis of spatial distributions of interfering beams. As a consequence, the relationship between the beam incidence conditions and interference patterns is revealed. The proposed method is useful for the calibration of LIL processes and for reverse engineering applications.Citation
Wang D., Wang Z., Yue Y., Yu J., Tan C., Li D., Qiu R., Maple C. (2015) 'Determination of beam incidence conditions based on the analysis of laser interference patterns', Optik, 126 (21), pp.2902-2907.Publisher
Elsevier GmbHJournal
OptikAdditional Links
http://www.sciencedirect.com/science/article/pii/S0030402615005914Type
ArticleLanguage
enISSN
0030-4026ae974a485f413a2113503eed53cd6c53
10.1016/j.ijleo.2015.07.039
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