Determination of surface roughness of plane optical components using quasimonochromatic light source and phase shifting interferometry

2015 ◽  
Vol 54 (6) ◽  
pp. 064102 ◽  
Author(s):  
Sanjib Chatterjee ◽  
Y. Pavan Kumar
Keyword(s):  
Surface Roughness ◽  
Light Source ◽  
Phase Shifting ◽  
Optical Components ◽  
Phase Shifting Interferometry

Determination of Phase Shift by Digital Holography

2019 ◽  
Vol 888 ◽  
pp. 43-46
Author(s):  
Yoshitaka Takahashi ◽  
Masatoshi Saito ◽  
Toru Nakajima ◽  
Masakazu Shingu
Keyword(s):  
Phase Shift ◽  
Noise Reduction ◽  
Digital Holography ◽  
High Accuracy ◽  
Measured Data ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement ◽  
Phase Shifting Interferometry

In phase shifting interferometry phase shift is applied by various ways, but applying it with high accuracy, especially by LD current modulation, is not easy. In order to determine the accurate phase shift a new method has been proposed that the value of LD current corresponding to π/2 phase shift can be determined by phase shifting digital holography. The measured data of standard in surface shape measurement were used for calibration, and the obtained value was confirmed to cause noise reduction and improvement of holographic reconstructed images in digital holography.

scholarly journals Measurement of wavefront structure from large-aperture optical components by phase-shifting interferometry

1995 ◽  
Author(s):  
C. Robert Wolfe ◽  
Janice K. Lawson ◽  
Marcia C. Kellam ◽  
Richard T. Maney ◽  
Anthony Demiris
Keyword(s):  
Phase Shifting ◽  
Optical Components ◽  
Large Aperture ◽  
Phase Shifting Interferometry
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