title: Autofocusing based on wavelength dependence of diffraction in two-wavelength digital holographic microscopy.
abstract: An autofocusing method for two-wavelength digital holographic microscopy (TWDHM) based on the wavelength dependence of the diffraction process is proposed. Red and green lights are employed for the illumination of the TWDHM, and the generated holograms are recorded simultaneously by a color CCD camera. Due to the wavelength dependency of the diffraction process, the farther the reconstruction plane is from the image plane, the larger the difference is between the red and green light distributions. Thus, the image plane can be determined by finding the minimum of the variation between the red and green lights on their amplitude distributions. The feasibility of the proposed method is demonstrated by simulation and experiment.
authors.affiliation: State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Gao
authors.forename: Baoli
authors.initials: B
authors.lastname: Yao
authors.forename: Romano
authors.initials: R
authors.lastname: Rupp
authors.forename: Junwei
authors.initials: J
authors.lastname: Min
authors.forename: Rongli
authors.initials: R
authors.lastname: Guo
authors.forename: Baiheng
authors.initials: B
authors.lastname: Ma
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Zheng
authors.forename: Ming
authors.initials: M
authors.lastname: Lei
authors.forename: Shaohui
authors.initials: S
authors.lastname: Yan
authors.forename: Dan
authors.initials: D
authors.lastname: Dan
authors.forename: Tong
authors.initials: T
authors.lastname: Ye