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.
A flip mirror is used for steering the laser beam into a powermeter head. Red dashed arrow shows the direction of laser beam propagation here and in Figures 3-7.
