Surface topographic characterization of optical storage devices by Digital Holographic Microscopy

When an optical disc is illuminated by an incandescent lamp, a bright colored line can be observed on its surface, and the color of the bright line differs with the change of the observer's position. Based on the optical reflection grating structure of DVD, we first establish an optial path model of a source-disc-observer system. Then, we derive analytic equation describing the relationship between the wavelength of the bright lines and the observation angles by applying the scalar diffraction theory. Finally, a simple experimental investigation is carried out and the reliability of the theoretical model is successfully confirmed. This study can be applied to physics experimental teaching in universities, providing a compelling teaching example for students to deeply understand the optical structures and diffraction properties of optical discs.

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Improvement of Fresnel Diffraction Convolution Algorithm

Ge,

Song,

Caiyang

et al. 2024

Applied Sciences

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With the development of digital holography, the accuracy requirements for the reconstruction phase are becoming increasingly high. The transfer function of the double fast transform (D-FFT) algorithm is distorted when the diffraction distance is larger than the criterion distance dt, which reduces the accuracy of solving the phase. In this paper, the Fresnel diffraction integration algorithm is improved by using the low-pass Tukey window to obtain more accurate reconstructed phases. The improved algorithm is called the D-FFT (Tukey) algorithm. The D-FFT (Tukey) algorithm adjusts the degree of edge smoothing of the Tukey window, using the peak signal-to-noise ratio (PSNR) and the structural similarity (SSIM) to remove the ringing effect and obtain a more accurate reconstructed phase. In a simulation of USAF1951, the longitudinal resolution of the reconstructed phase obtained by D-FFT (Tukey) reached 1.5 μm, which was lower than the 3 μm obtained by the T-FFT algorithm. The results of Fresnel holography experiments on lung cancer cell slices also demonstrated that the phase quality obtained by the D-FFT (Tukey) algorithm was superior to that of the T-FFT algorithm. D-FFT (Tukey) algorithm has potential applications in phase correction, structured illumination digital holographic microscopy, and microscopic digital holography.

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Surface topographic characterization of optical storage devices by Digital Holographic Microscopy

Cited by 3 publications

References 24 publications

Illumination system contributing zooming function to lensless digital holographic microscope by using lightguide incorporated with volume holographic optical elements

Illumination system contributing zooming function to lensless digital holographic microscope by using lightguide incorporated with volume holographic optical elements

Analysis of DVD diffraction patterns under oblique light illumination

Improvement of Fresnel Diffraction Convolution Algorithm

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