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.
Parks AD, Spence SE.Parks AD, et al. Among authors: spence se.Appl Opt. 2012 Jun 1;51(16):3364-9. doi: 10.1364/AO.51.003364.Appl Opt. 2012.PMID: 22695571
Parks AD, Spence SE.Parks AD, et al. Among authors: spence se.Appl Opt. 2015 Jun 20;54(18):5872-6. doi: 10.1364/AO.54.005872.Appl Opt. 2015.PMID: 26193042