Well, the article was copy pasted from a web page with a big old "Copyright ©2013 The Optical Society" at the bottom. So yeah, it's textbook copyright infringement; press releases (or publicity blurbs, in this case) are protected by copyright law. I don't think the Optical Society was likely to pursue legal action against Wikipedia for this, but it's perfectly reasonable for Wikipedia to enforce a policy of "don't copy paste copyrighted material into articles."