Depth resolution enhancement in optical scanning holography with a dual-wavelength laser source

Jun Ke; Ting-Chung Poon; Edmund Y Lam

doi:10.1364/AO.50.00H285

Depth resolution enhancement in optical scanning holography with a dual-wavelength laser source

Appl Opt. 2011 Dec 1;50(34):H285-96. doi: 10.1364/AO.50.00H285.

Authors

Jun Ke¹, Ting-Chung Poon, Edmund Y Lam

Affiliation

¹ Imaging Systems Laboratory, Department of Electrical and Electronic Engineering, University of Hong Kong, Pokfulam, Hong Kong.

PMID: 22193019
DOI: 10.1364/AO.50.00H285

Abstract

In this paper, we use two point sources to analyze the depth resolution of an optical scanning holography (OSH) system with a single-wavelength source. A dual-wavelength source is then employed to improve it, where this dual-wavelength OSH (DW-OSH) system is modeled with a linear system of equations. Object sectioning in DW-OSH is obtained with the Fourier domain conjugate gradient method. Simulation results show that, with the two source wavelengths at 543 nm and 633 nm, a depth resolution at 2.5 μm can be achieved. Furthermore, an OSH system emulator is provided to demonstrate the performance of DW-OSH compared with a conventional OSH system.