A new biphotonic process providing a means for recording holographic patterns produced by laser sources emitting in the near infra-red is presented. This recording process, known as the "two-photon-two-product" technique, works according to the following basic ideas : a first photon of coherent light promotes oxygen dissolved in the reactive medium into its singlet form through a photosensitization process. The excited species oxides then an adap-ted chemical trap which becomes converted into a carbonyl compound. The latter absorbs a second photon-coherent or not- and acts as a photoinitiator of polymerization. A spatially inhomogeneous photoreaction develops in the active medium, thus, inducing changes of refractive index which can be used to record holographic pictures. The attractive advantages of this system are its outstanding light sensitivity and the gating property associated with the two-photon process.

Date Published: 31 March 1989
PDF: 8 pages
Proc. SPIE 1026, Holography Techniques and Applications, (31 March 1989); doi: 10.1117/12.950220

Published in SPIE Proceedings Vol. 1026:
Holography Techniques and Applications
Werner P. O. Jueptner, Editor(s)