Lenses with air pressure independent back focal length

Eckhard Langenbach

doi:10.1364/IODC.1998.LMA.3

International Optical Design Conference
Technical Digest Series (Optica Publishing Group, 1998),
paper LMA.3
•https://doi.org/10.1364/IODC.1998.LMA.3

Lenses with air pressure independent back focal length

Eckhard Langenbach

International Optical Design Conference 1998

Kailua-Kona, Hawaii United States
8–12 June 1998
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Optical Design Theory 1 (LMA)

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E. Langenbach, "Lenses with air pressure independent back focal length," in International Optical Design Conference, Technical Digest Series (Optica Publishing Group, 1998), paper LMA.3.

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Abstract

The focal length of optical systems normally depends on the refractive index n of the surrounding medium. Moving for example a lens from normal air with n_air ≈ 1.00027 into a vacuum chamber with n_vac = 1.00000 requires refocussing due to the change of the back focal length. Design methods to avoid this effect are introduced in the following sections.

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