Fast mask CD uniformity measurement using zero order diffraction from memory array pattern

2009 ◽  
Author(s):  
Jinseok Heo ◽  
Jinhong Park ◽  
Jeongho Yeo ◽  
Seongwoon Choi ◽  
Woosung Han
Keyword(s):  
Zero Order ◽  
Memory Array ◽  
Array Pattern ◽  
Order Diffraction

The splitting mechanism of zero order diffraction pattern by roof prisms

2013 ◽  
Vol 42 (4) ◽  
pp. 367-375
Author(s):  
Lu Jinjun ◽  
Sun Xueping ◽  
Zhu Weibing
Keyword(s):  
Diffraction Pattern ◽  
Zero Order ◽  
Order Diffraction

Effect of Phase-Shifting Error on Deformation Evaluation Using Phase-Shifting Digital Holography

2006 ◽  
Vol 326-328 ◽  
pp. 27-30
Author(s):  
Xin Kang ◽  
Xiao Yuan He ◽  
Cho Jui Tay ◽  
C. Quan
Keyword(s):  
Computer Simulation ◽  
Digital Holography ◽  
Zero Order ◽  
Phase Shifting ◽  
Phase Shifting Technique ◽  
Order Diffraction

Phase-shifting technique is an effect way to suppress the zero order diffraction and the conjugate term in digital holography. However the phase-shifting error will influence inevitably the evaluation precision in practice operation. In this paper, the deformation evaluation errors by means of two kinds of four-step phase-shifting algorithms, which are in common use in digital holography, are analyzed and compared by computer simulation. In addition, the phase-shifting errors may cumulate or not according to different phase-shifting techniques, and both cases are considered in this paper. The results based on the digital in-line holography show that the two four-step phase-shifting algorithms possess different sensitivity to the phase-shifting errors, and the preferable one, which is more immune to the phase-shifting errors, is educed in conclusion.

scholarly journals The study of color digital holography free from the zero-order diffraction interruption

2011 ◽  
Vol 60 (3) ◽  
pp. 034204
Author(s):  
Fan Ze-Bin ◽  
Song Qing-He ◽  
Li Jun-Chang ◽  
Tankam Patrice ◽  
Picart Pascal
Keyword(s):  
Digital Holography ◽  
Zero Order ◽  
Order Diffraction

Heat reflecting optical filter based on zero-order diffraction

2008 ◽  
Vol 516 (14) ◽  
pp. 4656-4658 ◽  
Author(s):  
Harald Walter ◽  
Alexander Stuck
Keyword(s):  
Optical Filter ◽  
Zero Order ◽  
Order Diffraction

Restoration and Enhancement of Digitally Reconstructed Holographic Images

2011 ◽  
pp. 105-120
Author(s):  
Rajeev Srivastava
Keyword(s):  
Image Quality ◽  
Image Data ◽  
Speckle Noise ◽  
Zero Order ◽  
Speckle Reduction ◽  
Average Intensity ◽  
Robust Algorithms ◽  
Order Diffraction ◽  
High Pass

Holograms can be reconstructed optically or digitally with the use of computers and other related devices. During the reconstruction phase of a hologram by optical or digital methods, some errors may also be introduced that may degrade the quality of obtained hologram, and may lead to a misinterpretation of the holographic image data, which may not be useful for particular application. The basic common errors are zero-order diffraction and speckle noise. These errors have more undesirable effects in digital than in optical holography because the systems of recording and visualization used in the digital holography are extremely sensitive to them or inclusively increase them. The zero-order diffraction can be removed by using high pass filters with low cut-off frequencies and by subtracting the average intensity of all pixels of the hologram image from the original hologram image. Further, the speckle noise introduced during the formation of digital holographic images, which is multiplicative in nature, reduces the image quality, which may not be suitable for specific applications. As the range of applications get broader, demands toward better image quality increases. Hence, the suppression of noise, higher resolution of the reconstructed images, precise parameter adjustment, and faster, more robust algorithms are the essential issues. In this chapter, the various methods available in literature for enhancement and speckle reduction of digital holographic images have been discussed, and a comparative study of results has been presented.

Elimination of zero-order diffraction in digital off-axis holography

2004 ◽  
Vol 240 (4-6) ◽  
pp. 261-267 ◽  
Author(s):  
Yimo Zhang ◽  
Qieni Lü ◽  
Baozhen Ge
Keyword(s):  
Zero Order ◽  
Order Diffraction

A Display Based On Switchable Zero Order Diffraction Grating Light Valves

1985 ◽  
Author(s):  
Josephine A. Steir ◽  
Jan A. Rajchman ◽  
John Melngailis ◽  
Deborah A. Summa
Keyword(s):  
Diffraction Grating ◽  
Zero Order ◽  
Order Diffraction

Method for eliminating zero-order diffraction in lensless Fourier transform digital holography

Optik ◽  
2013 ◽  
Vol 124 (21) ◽  
pp. 4873-4875
Author(s):  
Y.P. Zhang ◽  
J.Q. Zhang ◽  
W. Xu
Keyword(s):  
Fourier Transform ◽  
Digital Holography ◽  
Zero Order ◽  
Order Diffraction

Elimination of zero-order diffraction and conjugate image in off-axis digital holography

2009 ◽  
Vol 56 (21) ◽  
pp. 2377-2383 ◽  
Author(s):  
Lihong Ma ◽  
Hui Wang ◽  
Yong Li ◽  
Haijun Zhang
Keyword(s):  
Digital Holography ◽  
Zero Order ◽  
Order Diffraction
Sign in / Sign up

Export Citation Format

Share Document