Appeal No. 1997-3528
Application No. 08/230,659
reading beam, although “the sample could only be read out with
an external electric field applied to establish the
nonlinearity.” (Column 14, line 65 to column 15, line 35.)
Bjorklund describes a process for producing net gain in
photorefractive two beam coupling comprising exposing a
polymeric optical article to an external electric field and
two intersecting beams of coherent electromagnetic radiation.
(Column 2, lines 30-35.) According to Bjorklund, the optical
article comprises: (i) at least 50% by weight of a charge
transporting polymer having an absorption coefficient at the
wavelength of the incident radiation of less than 0.1 cm ;-1
(ii) a non-linear optical chromophore which, when oriented by
the
external electric field, imparts to the optical article at the
wavelength of incident radiation sufficient optical
nonlinearity to provide a change in the optical index of
refraction per unit electric field of greater than 0.1
picometer per volt; and (iii) a sensitizer. (Column 2, lines
35-45.) In example 2, for instance, Bjorklund teaches that
the photoconductivity of the article was demonstrated by
placing a 500 V bias across the sample and measuring the
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