Browse Prior Art Database

Optical Filter

IP.com Disclosure Number: IPCOM000094840D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Young, JER: AUTHOR

Abstract

The optical system serves as a filter for splitting input light into its spectral components. The system then recombines selected ones of the spectral components to produce an optical output having a spectrum which consists only of selected frequencies.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Optical Filter

The optical system serves as a filter for splitting input light into its spectral components. The system then recombines selected ones of the spectral components to produce an optical output having a spectrum which consists only of selected frequencies.

White light source 5 is positioned to transmit incident light through half- silvered plane mirror 7 and then through converging lens 6 so as to focus such light at the opening in shutter 2. The diverging beam of light from such opening impinges upon grating 1. The latter diffracts the light so as to split it into its spectral components, the first order spectral components being each brought to a focus on separate mirrors 3.

All the elements, namely, opening in shutter 2, diffraction grating 1, and mirrors 3 lie on a Rowland circle. Mirrors 3 are selectively positioned so that only desired spectral components focus on such mirrors 3. Light incident on mirrors 3 is reflected back along its own path toward grating 1, then through opening in shutter 2, through lens 6 and downward from half-silvered plane mirror 7. A virtual image 8 of the source 5 is produced, except that such virtual image 8 has a combined spectrum consisting of only those frequencies selected by the optical system. The output light 8 can be used for reading information out of or writing information into Lippman films.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]