Multiple-wave lateral shearing interferometry with a liquid-crystal geometric phase grating

2021 ◽  
Author(s):  
Emiel H. Por ◽  
Matthew A. Kenworthy ◽  
Sebastiaan Y. Haffert ◽  
Frans Snik ◽  
Jolanda Frensch ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Geometric Phase ◽  
Multiple Wave ◽  
Phase Grating ◽  
Shearing Interferometry ◽  
Lateral Shearing ◽  
Lateral Shearing Interferometry

Study on Measurement of Thin Film Thickness with Lateral Shearing Interferometry

2013 ◽  
Vol 718-720 ◽  
pp. 848-852
Author(s):  
Jun Hong Su ◽  
Ying Shi ◽  
Jin Man Ge
Keyword(s):  
Film Thickness ◽  
Transform Method ◽  
Shearing Interferometry ◽  
Platform Process ◽  
Fast Fourier Transform Method ◽  
Lateral Shearing ◽  
Phase Unwrap ◽  
Technical Indicator ◽  
Lateral Shearing Interferometry ◽  
Shearing Interference

The film thickness is an important technical indicator of film devices, and its accuracy directly affects various performances of optical components. In fabrication process of film device, fast and accurate measurement of film thickness has positive significance on product quality control. In this paper, measure film thickness with lateral shearing interferometry. Collect interferograms through structured lateral shearing interference platform, process interferogram with Fast Fourier Transform method to extract phase, unwrap the wrapped phase to achieve phase value. Finally, calculate film thickness based on lateral shearing interference principle. The thickness of sample is 119.6800nm measured by this method, basically the same with the result 120.6036nm that measured by ZYGO interferometer. This experiment shows that lateral shearing interferometry not only suit to measurement of film thickness, but also abundant high-precision method of measuring film thickness, and has high practical value.

Real-Time Measurement of Atmospheric Coherence Length Based on Lateral Shearing Interferometry

2014 ◽  
Vol 41 (12) ◽  
pp. 1208006
Author(s):  
周健 Zhou Jian ◽  
孙建锋 Sun Jianfeng ◽  
鲁伟 Lu wei ◽  
马小平 Ma Xiaoping ◽  
刘立人 Liu Liren
Keyword(s):  
Real Time ◽  
Coherence Length ◽  
Time Measurement ◽  
Shearing Interferometry ◽  
Real Time Measurement ◽  
Lateral Shearing ◽  
Lateral Shearing Interferometry

Quadriwave lateral shearing interferometry in an achromatic and continuously self-imaging regime for future x-ray phase imaging

2011 ◽  
Vol 36 (8) ◽  
pp. 1398 ◽  
Author(s):  
Julien Rizzi ◽  
Timm Weitkamp ◽  
Nicolas Guérineau ◽  
Mourad Idir ◽  
Pascal Mercère ◽  
...  
Keyword(s):  
Phase Imaging ◽  
Shearing Interferometry ◽  
X Ray ◽  
Lateral Shearing ◽  
Lateral Shearing Interferometry
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