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Process and recording media for continuous wave four-level, two-photon holography
| Details |
Inventors: Alvarez, David C.; Bjorklund, Gary C.; Burland, Donald M.;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Downey; Mary F.
Assistant Examiner:
Attorney, Agent or Firm: Walsh; Joseph G.
A process and recording medium for four-level, two-photon holography are provided. These media are particularly useful for recording holograms using continuous wave lasers. The recording medium is formed by a transport resin containing a tetrazine compound. |
|
DETAILED DESCRIPTION We claim: 1.
A recording medium for holography, said medium comprising a transparent resin containing from 10.
sup.
-5 to 0.
1 gram/cc of a tetrazine compound.
2.
A medium as claimed in claim 1 wherein the tetrazine compound is a 3,6-dialkyl-1,2,4,5-tetrazine.
3.
A medium as claimed in claim 1 wherein the tetrazine compound is 3,6-dimethyl-1,2,4,5-tetrazine.
4.
A medium as claimed in claim 1 wherein the tetrazine compound is present at a concentration of from about 0.
05 gram/cc to about 0.
1 gram/cc.
5.
A medium as claimed in claim 1 wherein the transparent resin is polyvinylcarbazole.
6.
A recording medium for continuous wave two-photon holography comprising polyvinylcarbazole resin containing 3,6-dimethyl-1,2,4,5-tetrazine at a concentration of about 0.
05 to 0.
1 gram per cc.
7.
A process for two-photon, four-level holographic recording, said process comprising the steps of: (1) shining a single beam of light of frequency .
omega.
.
sub.
1 upon a four-level holographic recording medium, and (2) exposing the recording medium to laser light at frequency .
omega.
.
sub.
2, thereby forming a holographic interference pattern in the recording medium and changing the index of refraction and/or the absorption coefficient of said recording medium.
8.
A process as claimed in claim 7 wherein .
omega.
.
sub.
1 equals .
omega.
.
sub.
2.
9.
A process as claimed in claim 7 wherein .
omega.
.
sub.
1 does not equal .
omega.
.
sub.
2.
10.
A process as claimed in claim 7 wherein the light is from a continuous wave laser.
Description:
DESCRIPTION 1.
Technical Field The present invention is concerned with a process and recording media for holography.
In particular, it is concerned with four-level materials useful for two-photon holography.
These materials are particularly useful for holographic recording using continuous wave lasers.
A specific example of such a recording medium is formed by a transparent resin containing a tetrazine compound therein.
2.
Prior Art The state of the prior art is illustrated by the following references: 1
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