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) Periodic structure of the optical chopper. (b) Temporal waveforms of the amplitude-modulated laser light at three modulation frequencies of 0 Hz (black), 50 Hz (red), and 130 Hz (blue). Note that a modulation frequency of 0 Hz yields the unmodulated CW output.
