OSA's websites, including Optics InfoBase and OSA.org are currently unavailable due to maintenance scheduled for Friday, 25 July 2014. We expect this unavailability to last from approximately 20:00 (EDT, UTC-04) to 02:00 (EDT, UTC-04).
We thank you for your patience as we work to improve our services.
If you need assistance, OSA's Customer Service can be reached at +1 202.416.1907 (Worldwide) +1 800.766.4672 (US/Canada) or by emailing us.
Customer Service is available from 07:30 to 18:00 ( EDT, UTC -04 ) Monday through Friday.