Fig. 2.
The absorption and emission curves are shown by the dashed and solid lines, respectively. The edge of the source filter is the red line. The emission filter has 90% transmission for wavelengths greater than 641 nm.
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.