Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
권호 표지

Design of an Endoscope Objective Lens with a High Numerical Aperture and a Minimally-Invasive Outer Diameter

Rim, Cheon-Seog;Kim, Phil-Han;Yun, Seok-Hyun

  • Published : 20070700
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Abstract

Graded-index (GRIN) objective lenses are very simple in construction and easily secure a proper overall length to diagnose some defects beneath the skin for medical treatment. However, graded-index objective lenses have a limitation of numerical aperture (NA) that directly relates to the optical resolution. These lenses work well under a NA of 0.25, at best, which is free from spherical aberration. We present an endoscope objective lens composed of graded-index lenses with an adaptor that can correct the spherical aberration of GRIN rods with a high numerical aperture of 0.5 and a minimally-invasive outer diameter of 1 mm. That is, by attaching a simple adaptor on the GRIN rods, the endoscope objective lens has an optically diffraction-limited performance for 0.5 NA, which makes the manufacture easier and less expensive.

Keywords

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