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Optimization of Hybrid Optics with Multilevel Phase Mask for Improved Depth of Focus Broadband Imaging

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publication2018 7th European Workshop on Visual Information Processing (EUVIP)
Number of pages6
ISBN (Electronic)978-1-5386-6897-9
ISBN (Print)978-1-5386-6898-6
Publication statusPublished - Nov 2018
Publication typeA4 Article in a conference publication
EventEuropean Workshop on Visual Information Processing -
Duration: 1 Jan 1900 → …

Publication series

ISSN (Electronic)2471-8963


ConferenceEuropean Workshop on Visual Information Processing
Period1/01/00 → …


This paper is devoted to designing of hybrid refractive/diffractive optics for high-quality imaging with improved depth of focus (DoF). The novelty of the concept is in sharing of the optical power of the refractive lens between the lens and a multilevel phase mask (MLM) as a diffractive optical element (DOE). The efficiency of the design is confirmed by numerical results. Broadband multiwavelength test-images are exploited for the design and testing of the system. It is shown that the obtained hybrid optical system in combination with computational inverse imaging provides both a better image quality (due to the robustness of the designed optics to chromatic aberrations) and an extended depth of focus as compared with the refractive lens and the diffractive lensless design with MLM.


  • Optical imaging, Optical refraction, Optical diffraction, Lenses, Optical sensors, Broadband communication, Multilevel diffractive optical elements, multilevel phase mask design, wavefront coding, extended depth of focus, computational imaging, chromatic aberrations, inverse imaging

Publication forum classification

Field of science, Statistics Finland