Browse Prior Art Database

Monitoring Concurrent Exposure and Development of Photosensitive Medium

IP.com Disclosure Number: IPCOM000090582D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Park, KC: AUTHOR [+2]

Abstract

Development of a photosensitive medium that is rendered phototropic occurs at the same time the medium is exposed to radiation. Concurrently, monitoring of the exposure and development is performed. Monitoring can be performed with conventional recording systems as well as the systems recording in the form of interference patterns.

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Monitoring Concurrent Exposure and Development of Photosensitive Medium

Development of a photosensitive medium that is rendered phototropic occurs at the same time the medium is exposed to radiation. Concurrently, monitoring of the exposure and development is performed. Monitoring can be performed with conventional recording systems as well as the systems recording in the form of interference patterns.

Phototropic photosensitive medium 10 is positioned to accept the interfering beams of radiation 11 and 12 to form an interference pattern. By acting on certain parameters of this radiation, the exposure and development of the photosensitive medium are monitored simultaneously. Laser 13 is used as the source of radiation. It provides beam 14 through shutter 15 to stage 16 capable of moving in two directions. Stage 16 includes beam splitter 17, mirror 18, and objective pinhole combination 19.

A slight rotation in the state of polarization is introduced into reference beam 12 by inserting half-wave plate 20 in the path of beam 12 after reflection at mirror
21. In this form. beam 12 has a polarization state that is no longer exactly parallel to the state of polarization of signal beam 11. Even though the polarizations are slightly different for beams 11 and 12, a hologram is formed by the interference of beam 11 and the component of beam 12 that has the same polarization as that of beam 11.

The other polarization component of beam 12 does not enter into the recording p...