1. Noise suppression using quasi-phase conjugation in digital holographic microscopy
- Author
-
Huang-Tian Chan, Mark Shey Sussman, Min-Tzung Shiu, Chi-Ching Chang, and Yang-Kun Chew
- Subjects
Physics ,Diffraction ,Noise (signal processing) ,business.industry ,Scattering ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Signal ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,Wavelength ,Optics ,0103 physical sciences ,Digital holographic microscopy ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,Adaptive optics ,Phase conjugation ,business - Abstract
Various approaches for generating phase-conjugate signal have been recently proposed that exploit the advantage of noise suppression in digital holographic microscopy (DHM). This study presents a reproducible method for generating a time-independent quasi-phase conjugated signal, which is simple, compact, and cost-effective in a linear medium. Used in conjunction with adaptive optics or conventional phase conjugation technique, our method suppresses the influence of diffraction and has less constraint on wavelength and polarization state. Such a configuration generates quasi-phase conjugated signal in real time and supports multi-wavelength input simultaneously. The optical system produces images of high magnification and high resolution of 228.1 line pairs per mm (i.e. 2. 19 μ m ) and has low spatial standard deviation of 0.2 nm. In addition, scattering noise of 15 degrees diffusing angle from object is suppressed effectively.
- Published
- 2021