An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Roos A, Rönnow D.Roos A, et al. Among authors: ronnow d.Appl Opt. 1996 Jun 1;35(16):3076. doi: 10.1364/AO.35.003076.Appl Opt. 1996.PMID: 21085463No abstract available.