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Paper Information

Title: 

VACUUM EFFECT IN ENVIRONMENTAL STABILITY OF SILVER HALIDE SENSITIZED GELATIN HOLOGRAMS

Type: PAPER
Author(s): HARIRIAN ZOHREH*,PARTOVI SHABESTARI NASER
 
 *LASER AND OPTICS RESEARCH SCHOOL, NUCLEAR SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE (NSTRL), END OF NORTH KAREGAR AVE., TEHRAN
 
Name of Seminar: NATIONAL VACUUM CONFERENCE IRAN
Type of Seminar:  CONFERENCE
Sponsor:  Industrial sharif University
Date:  2008Volume 3
 
 
Abstract: 

UP TO NOW, THE DESIGN AND FABRICATION OF ABERRATION- FREE OPTICAL ELEMENTS (BE IT CHROMATIC OR GEOMETRIC) HAS BEEN DONE, MAINLY THROUGH COMBINATION OF OPTICS WHICH INVOLVES CUMBERSOME CALCULATIONS. HOWEVER, SINCE ACTIVE APPEARANCE OF HOLOGRAPHY, THE OLD METHOD IS GRADUALLY BEING REPLACED BY HOLOGRAPHIC FABRICATION METHODS. THESE NEW METHODS HAVE RESULTED IN PRODUCTION OF A NEW GENERATION OF OPTICS CALLED HOLOGRAPHIC OPTICAL ELEMENT (HOE). IN THIS WORK THE METHOD OF SILVER HALIDE SENSITIZED GELATIN (SHSG) IS USED IN ORDER TO MAKE PHASE TRANSMISSION HOLOGRAMS. THE TERM SHSG DENOTES AN ALL–GELATIN PHASE MATERIAL WHICH RECORDS THE INITIAL IMAGE INFORMATION THROUGH PHOTON ABSORPTION BY THE SILVER HALIDE THE IMAGE IS STORED AS THE DIFFERENCES IN THE REFLECTIVE INDEX WITHIN THE REMAINING GELATIN. BY PLACING THE SAMPLE IN THE VACUUM AT THE END OF PROCESSING FOR DEHYDRATION, WE INCREASE THE QUALITY AND KEEP THE STABILITY UP TO THE TEMPERATURE OF 110ºС. THIS TECHNIQUE THAT PROPOSED RECENTLY IS ONE OF THE MOST PROMISING TECHNIQUES FOR THE FABRICATION OF TRANSMISSION HOE. WE MADE PHASE TRANSMISSION GRATINGS WITH DIFFRACTION EFFICIENCY OF 70% WHICH IS COMPARABLE WITH RECENT WORLD RECORDS.

 
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