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Proceedings Paper

Thermal stability enhancement of photochromic holograms
Author(s): Yuri Boiko
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Paper Abstract

Significant enhancement of the thermal stability of the hologram recorded on photochromic materials had been achieved via covalent bonding of the photochromic dye to the polymer matrix as compared to the host-guest systems. One time partial reduction of the hologram's initial diffraction efficiency due to thermal exposure was observed for both - polymers with attached dye as well as host-guest materials. Such one time reduction is interpreted to be due to the thermal relaxation of the polymer network induced with photochromic transition in the dye molecule. A gradual hologram erasure at elevated temperatures was observed for the host-guest system, which is assumed to be due to dye's diffusion between highly lit and dark areas. At temperatures ca. 100 °C there was no detectable diffusion type degradation of the hologram after 6 hours of exposure to elevated temperature. Same heating of the hologram in photochromic host-guest polymer led to a full hologram erasure within 40 minutes. In both cases the one time reduction of the diffraction efficiency (DE) due to matrix relaxation and heat adjustment had comparable value of about 0.5 of hologram's initial DE.

Paper Details

Date Published: 3 February 2009
PDF: 7 pages
Proc. SPIE 7233, Practical Holography XXIII: Materials and Applications, 723318 (3 February 2009); doi: 10.1117/12.808613
Show Author Affiliations
Yuri Boiko, YBBR, Inc. (Canada)


Published in SPIE Proceedings Vol. 7233:
Practical Holography XXIII: Materials and Applications
Hans I. Bjelkhagen; Raymond K. Kostuk, Editor(s)

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