Claims
- 1. A method for increasing the spectral sensitivity of a dichromated gelatin-based hologram which comprises the steps of
- a. preparing an aqueous solution of gelatin and ammonium dichromate;
- b. casting said solution onto a glass substrate to form a substrate having a radiation sensitive dichromated gelatin layer;
- c. exposing said layered substrate to room light to preharden said gelatin layer;
- d. sensitizing said gelatin layer by immersing said layered substrate into a solution containing (1) a spectrally sensitive acid fast violet dye selected from the group consisting of the thiazine and triphenylmethane dyes and, (2) ammonium dichromate;
- e. drying said sensitized gelatin layer and then exposing said dried gelatin layer to the interfering beams of a He-Ne laser to give a 200 mJ/cm.sup.2 average exposure; and
- f. developing said exposed gelatin layer to form a phase hologram containing a permanent fringe pattern from the said interfering laser beams.
STATEMENT OF GOVERNMENT INTEREST
The invention described herein may be manufactured and used by or for the Government for governmental purpose without the payment of any royalty thereon.
US Referenced Citations (3)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2,322,275 |
Nov 1973 |
DT |
763,388 |
May 1952 |
DT |
Non-Patent Literature Citations (1)
Entry |
Kosar, Light-Sensitive Systems, 8/27/65, pp. 71-74. |