Abstract
We present a method to extend the axial range of digital holographic microscopy based on the optimal modified lateral shearing interferometer (MLSI). The proposed system can extend the axial range by using a dual optical plate. The interference pattern with two spatial wavelengths is generated by the plate with different thicknesses. These spatial wavelengths transfer a dual spatial frequency into the Fourier plane by using FFT. Two phases are extracted by a dual spatial frequency and combined to create a synthetic wavelength, which is applied to measure the micrometer-scale object without phase unwrapping. Also, the noise-reducing algorithm is used to reduce phase noise caused by the amplified noise of the synthetic wavelength. The experimental result confirms the feasibility of the optimal MLSI by using a dual optical plate.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Kwang-Beom Seo and Seung-Ho Shin
Appl. Opt. 56(27) 7504-7511 (2017)
Manoj Kumar, Xiangyu Quan, Yasuhiro Awatsuji, Yosuke Tamada, and Osamu Matoba
Appl. Opt. 59(24) 7144-7152 (2020)
Byung-Mok Kim, Seong-Jin Park, and Eun-Soo Kim
Opt. Express 25(6) 6151-6168 (2017)