Editor's Comment on Focus Issues.
Focus Issues have been a key ingredient of Optics Express in the first six months, as every reader will have noticed. They are new to OSA journals, an innovation by Optics Express that was invented more or less out of thin air. I thought it would be useful to write a few paragraphs about them, since they are so new and still not familiar to most members of the optics community.
Eberly
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