Dual mirror optimized scanning for telecentric lens

Pouyan Rezapoor*, Aleksi Tamminen, Juha Ala-Laurinaho, Zachary Taylor

*Corresponding author for this work

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

Abstract

Galvanometers are commonly used in terahertz imaging systems due to their increased scanning speed in two dimensions. Typically, a telecentric f-theta lens is employed to ensure normal incidence on the target plane in reflective imaging systems. Galvanometric scanners, however, introduce beam aberrations in the target plane due to the use of a separate reflector for each scanning axis. In this work, we present a galvanometric scanner with a modified geometry, which reduces beam aberrations and increases telecentricity. Ray tracing and physical optics simulations show that by scanning the first reflector with respect to an offset point located at the center of the second reflector, the scanned beam behaves as if it is being scanned from a single point. By fixing this point in the focal point of the lens, we can minimize beam aberrations. Comparative analysis shows improved telecentricity (±1° at the scanning edge) and beam spot size, with acceptable f-theta distortion and negligible deviation from normal incidence.

Original languageEnglish
Title of host publication2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2024
PublisherIEEE
ISBN (Electronic)979-8-3503-7032-4
DOIs
Publication statusPublished - 2024
MoE publication typeA4 Conference publication
EventInternational Conference on Infrared, Millimeter, and Terahertz Waves - Perth, Australia
Duration: 1 Sept 20246 Sept 2024
Conference number: 49

Conference

ConferenceInternational Conference on Infrared, Millimeter, and Terahertz Waves
Abbreviated titleIRMMW-THz
Country/TerritoryAustralia
CityPerth
Period01/09/202406/09/2024

Keywords

  • Physical Optics
  • Ray Tracing
  • Terahertz Imaging

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