DFB Lasers are single mode lasers containing an integrated grating structure. The result is a single mode emission at an outmost precise wavelength with an extremely narrow line width. DFB Lasers are for sophisticated industry applications, e.g. fiber testing, and science, such as analytics, Raman spectroscopy, frequency conversion, and exciting certain atom resonances.
Sellers for DFB lasers:
Eagleyard provides the largest variety of wavelengths available on the market, between 633nm and 1083 nm with output powers from 10mW to 150 mW.
Applications for DFB lasers:
A Review of Recent Papers and Articles 2014: