Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Two-photon lithography set-up (40× = objective lens magnification, NA = numerical aperture of the objective lens, M = telescope magnification, PH = pinhole, CCD = charge-coupled device camera, APD = avalanche photodiode, PC = personal computer).
