Proceedings of Topical Meeting on Optoinformatics (pdf-format, 1.21 ...

SAINT-PETERSBURG, October 17 – 20, 2005 31
STUDY OF PULSED HOLOGRAM RECORDING
ON THE PHOTOPOLYMERIC MATERIAL
V.N.Mikhailov, O.V.Bandyuk, D.A.Kozlovsky
Research center «S.I.Vavilov State Optical Institute», Saint-Petersburg, Russia
viktormikhailov@yahoo.com
Results <strong>of</strong> research <strong>of</strong> pulsed recording <strong>of</strong> holograms with use <strong>of</strong> a
photosensitive composition on the basis <strong>of</strong> polyvinyl alcohol with acrylamide
are presented. The possibility <strong>of</strong> practical use <strong>of</strong> the given photopolymeric
material for record <strong>of</strong> pulsed holograms is shown.
The photopolymeric photosensitive composition on the basis <strong>of</strong> polyvinyl alcohol
with acrylamide is known enough for a long time [1,2] and was recommended as quite
suitable for recording <strong>of</strong> transmission holograms by use <strong>of</strong> cw lasers. However, till now its
use for record <strong>of</strong> pulsed holograms has been shown only under a high frequency lasing
mode [3] , actually approaching result <strong>of</strong> sequence <strong>of</strong> the big number <strong>of</strong> pulses to a cw
recording. In the given work we studied dynamics <strong>of</strong> recording <strong>of</strong> pulsed holograms by use
<strong>of</strong> short pulses <strong>of</strong> radiation (10 ns), which duration much less than characteristic times <strong>of</strong>
diffusion known by results <strong>of</strong> earlier works with use <strong>of</strong> continuous radiation [4] . The results
received in work have shown essential differences <strong>of</strong> dynamics <strong>of</strong> recording <strong>of</strong> holograms
by use <strong>of</strong> short laser pulses in comparison with cw exposure. The basic differences are: 1)
absence <strong>of</strong> the induction period which is typical for cw recording, and also 2) dependence
<strong>of</strong> efficiency to pulse recording from value <strong>of</strong> preliminary exposure (fig.1). Efficiency <strong>of</strong>
the pulsed hologram essentially raised in comparison with a case <strong>of</strong> absence preliminary
exposure. The mechanism <strong>of</strong> such behavior can be explained taking into account the
degree <strong>of</strong> polymerization during pulsed exposure. It is shown that preliminary pulse
exposure could be replaced on equivalent cw pre-exposure. It is demonstrated also, that at
use <strong>of</strong> a series <strong>of</strong> pulses effective recording <strong>of</strong> the superimposed holograms is possible
(fig.2). Work was supported by grant ТО2-02.5-1441 <strong>of</strong> the Ministry <strong>of</strong> Education <strong>of</strong>
Russia.
1. J.R.Lawrence, F.T.O'Neill, J.T.Sheridan, "Photopolymer holographic recording
material" // Optik, 2001, №10, pp.449-463.
2. C.A. Feely, S. Martin, V. Toal, "Optimization <strong>of</strong> an acrylamide-based dry
photopolymer holographic recording material", SPIE Proc., 1996, V.2688, pp.22-33.
3. C. Garcia, I. Pascual, A. Costela, I. Garcia-Moreno, A. Fimia, R. Rastre, “Experimental
study <strong>of</strong> the acrylamide photopolymer with a pulsed laser" // Opt. Commun., 2001, №
.188, pp.163-166.
4. J.H. Kwon, H.C. Hwang, K.C. Woo, "Analysis <strong>of</strong> temporal behavior <strong>of</strong> beams
diffracted by volume gratings formed in photopolymers" // JOSA B, 1999, V.16, №
.10, pp.1651-1657.