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.
Representation of the VFD device. The copper rod is hosted in a glass tube (20 mm OD, 17.5 mm ID) rotating at high speed (ranging between 4.5 k and 8.5 k rpm) and irradiated with a 5 ns pulsed Nd : YAG laser operating at 1064 nm and 600 mJ.
