Investigations of the Talbot effects for a grating illuminated by the ultrashort optical pulses

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• 作者：Xiaowei Dong ; ^{smile123k@163.com} ; Mengzhen Xu
• 关键词：Optical images ; Talbot effect ; Fresnel diffraction ; Optical signal processing
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：32-36
• 全文大小：448 K
• 卷排序：130

文摘

Based on the theories of the Fresnel diffraction and the signal processing, the Talbot effects for a grating illuminated by a train of ultrashort optical pulses are investigated numerically. Influences of the input pulse parameters and the grating structure on the Talbot images are discussed detailedly. Results demonstrate that the contrast of the high/low field boundary becomes obscure for the optical pulse with shorter temporal duration and chirp. And a grating with smaller duty cycle (DC) is easier to the formation of constructive interference field. In addition, although the high/low field distribution resembles as the image of grating period at the integer Talbot detecting planes, it repeats kk-times at the fractional Talbot detecting plane, which can be exploited for obtaining higher pulse repetition rate multiplication.