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Cheon-Seog Rim,Seok-Hyun Yun,Philhan Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
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.