Best Laser Diode: DFB Laser - Inphenix Inc.
https://www.inphenix.com/en/distributed-feedback-lasersdfbs/
A #distributedfeedbacklaser (DFB) is a type of laser diode or optical fiber laser where the active region of the device contains a periodically structured element or diffraction grating.
The spectral width of the Distributed feedback laser is narrow so it gives high output power and emits single-longitudinal mode coherent light. In a #DFBlaser, the grating and the reflection are generally continuous along the cavity.

