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.
Mitchell PV, Gaeta CJ, O'Meara TR, Pepper DM, Schiller CM, Horsky TN, Warde C.Mitchell PV, et al. Among authors: horsky tn.Opt Lett. 1993 Oct 15;18(20):1748-50. doi: 10.1364/ol.18.001748.Opt Lett. 1993.PMID: 19823505