
Proceedings Paper
Fabrication qualities of micro-gratings encoding dependence on laser parameters by two-beam femtosecond lasers interferenceFormat | Member Price | Non-Member Price |
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Paper Abstract
Femtosecond laser interference is a promising tool for micro-fabrication and micromachining of periodical structures on
the surface of samples or inside transparent materials, but femtosecond laser pulses are very hard to interfere due to their
spectrum widths may reach to several tens of nanometers, and their spectrum widths will be stretched by shorting the
duration according to the Fourier transform. We realized two 25 fs pulses interference and encoded micro-gratings on
Au-Cr thin films using this interference pattern. The interference patterns of two laser pulses with different pulse
durations in sub-hundred femtosecond time domain were calculated to explore the influence of pulse durations on
processing qualities of encoded micro-gratings. The results show that, the shorter pulses are preferable to fabricate
micro-gratings with fine resolution on intractable materials, and longer pulses are helpful to improve encoding efficiency
and contrast ratio of bright & dark interfered fringes. The differences between encoded micro-gratings on Au-Cr thin film
using these interference patterns validated our analysis, which are hardly observed when pulse duration is longer than
100 fs mainly because the size of interfered area is larger than the focal spots. Moreover, the distance between two focal
spots also has been chosen to identify our calculations, and the experimental results are agreement with the calculations.
Paper Details
Date Published: 6 February 2012
PDF: 8 pages
Proc. SPIE 8248, Micromachining and Microfabrication Process Technology XVII, 82480F (6 February 2012); doi: 10.1117/12.906980
Published in SPIE Proceedings Vol. 8248:
Micromachining and Microfabrication Process Technology XVII
Mary Ann Maher; Paul J. Resnick, Editor(s)
PDF: 8 pages
Proc. SPIE 8248, Micromachining and Microfabrication Process Technology XVII, 82480F (6 February 2012); doi: 10.1117/12.906980
Show Author Affiliations
Xianhua Wang, Xi'an Jiaotong Univ. (China)
Feng Chen, Xi'an Jiaotong Univ. (China)
Hewei Liu, Xi'an Jiaotong Univ. (China)
Hao Bian, Xi'an Jiaotong Univ. (China)
Feng Chen, Xi'an Jiaotong Univ. (China)
Hewei Liu, Xi'an Jiaotong Univ. (China)
Hao Bian, Xi'an Jiaotong Univ. (China)
Qing Yang, Xi'an Jiaotong Univ. (China)
Jinhai Si, Xi'an Jiaotong Univ. (China)
Xun Hou, Xi'an Jiaotong Univ. (China)
Jinhai Si, Xi'an Jiaotong Univ. (China)
Xun Hou, Xi'an Jiaotong Univ. (China)
Published in SPIE Proceedings Vol. 8248:
Micromachining and Microfabrication Process Technology XVII
Mary Ann Maher; Paul J. Resnick, Editor(s)
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