Abstract

When an optical system focuses light through a transparent cover sheet, refractive-index variations create spherical aberration which can be partially compensated by adjusting the cover-sheet thickness. In practice, a wide range of refractive index can be tolerated by a diffraction-limited objective lens given such thickness optimization. For example, a system with a numerical aperture of 0.6 and a nominal cover-sheet thickness of 1.2 mm can tolerate a refractive-index range from 1.45 to 1.60.

© 1986 Optical Society of America

Guided waves in graded-index planar waveguides with nonlinear cover medium

R. K. Varshney, M. A. Nehme, R. Srivastava, and R. V. Ramaswamy
Appl. Opt. 25(21) 3899-3902 (1986)

Gradient-index objective lens for the compact disk system

Hisami Nishi, Hiroyuki Ichikawa, Minoru Toyama, and Ichiro Kitano
Appl. Opt. 25(19) 3340-3344 (1986)

Spherical gradient-index sphere lens

Yasuhiro Koike, Yuji Sumi, and Yasuji Ohtsuka
Appl. Opt. 25(19) 3356-3363 (1986)

Finite conjugate spherical aberration compensation in high numerical-aperture optical disc readout

Sjoerd Stallinga
Appl. Opt. 44(34) 7307-7312 (2005)

Gradient-index slab lens with high numerical aperture

Yoshiyuki Asahara, Hiroyuki Sakai, Sigeaki Ohmi, Shin Nakayama, Yoshitaka Yoneda, and Tetsuro Izumitani
Appl. Opt. 25(19) 3384-3387 (1986)