FEATURES OF ACOUSTOOPTICAL PARAMETERS IN OLYGOETHER(METH) ACRYLATES

Changes of the acousto-optical quality coefficient in the olygoether(m eth)acrylate photopolymers of different chemical contents were investi gated on their temperature dependence. We have revealed that increasin g the number of aromatic rings and, to some extent, increasing the dis tance between neighbouring C=O chemical bonds leads to an increase of the acoustooptical quality coefficient M. It is also found that the pa rameter M increases with decreasing temperature below 80 K. A maximum value of the parameter M is always reached at low temperatures. Data o btained are in good agreement with previous investigations of the opti cal second harmonic generation. An essential influence of an external electric field on the acousto-optical properties of the mentioned phot opolymers was revealed. In our opinion, it reflects the essential role of a crystalline reorientation which gives a contribution to the acou sto-optical quality coefficient.